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# Engineering Sciences - (XE) 2018 GATE Paper (Practice Test)

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Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 1

### “Going by the _________ that many hands make light work, the school _______ involved all the students in the task.” The words that best fill the blanks in the above sentence are

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 2

### “Her _______ should not be confused with miserliness; she is ever willing to assist those in need.” The word that best fills the blank in the above sentence is

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 3

### Seven machines take 7 minutes to make 7 identical toys. At the same rate, how many minutes would it take for 100 machines to make 100 toys?

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 4

A rectangle becomes a square when its length and breadth are reduced by 10 m and 5 m, respectively. During this process, the rectangle loses 650 m2 of area. What is the area of the original rectangle in square meters?

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 5

A number consists of two digits. The sum of the digits is 9. If 45 is subtracted from the number, its digits are interchanged. What is the number?

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 6

For integers a,b and c, what would be the minimum and maximum values respectively of

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 7

Given that a and b are integers and a + b2 b3 is odd, which one of the following statements is correct?

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 8

From the time the front of a train enters a platform, it takes 25 seconds for the back of the train to leave the platform, while travelling at a constant speed of 54 km/h. At the same speed, it takes 14 seconds to pass a man running at 9 km/h in the same direction as the train. What is the length of the train and that of the platform in meters, respectively?

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 9

Which of the following functions describe the graph shown in the below figure?

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 10

Consider the following three statements:
(i) Some roses are red.
(ii) All red flowers fade quickly.
Which of the following statements can be logically inferred from the above statements?

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 11

Rheological diagram of different types of fluids is shown in figure. Column I represents the nature of the fluid and column II represents the curve showing the variation of shear stress against shear strain rate.

The most appropriate match between columns I and II is

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 12

In a two-dimensional, incompressible and irrotational flow, stream function and velocity potential exist. The velocities in x and y directions are non-zero.The product of

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 13

The inviscid flow past a rotating circular cylinder can be generated by the superposition of

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 14

The velocity field and the surface normal vector are given by,and  respectively. If Euler equations are to be solved, the boundary condition that must be satisfied at the wall is,

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 15

The influence of Froude number is most significant in

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 16

If the stream function  for a two-dimensional incompressible flow field is given as 2y ( x 2 - y2 ) , the corresponding velocity field is

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 17

Water is flowing in two different tubes of diameters D and 2D, with the same velocity. The ratio of laminar friction factors for the larger diameter tube to the smaller diameter tube is

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 18

If the velocity field is m/s,  vorticity of the fluid element in the field at

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 19

A pitot-static tube is used to measure air velocity in a duct by neglecting losses. The density of air is 1.2 kg/m3. If the difference between the total and static pressures is 1 kPa, the velocity of  air at the measuring location, in m/s, is _______.

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 20

The largest interval in which the initial value problem

has a unique solution is

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 21

The sum of the roots of the indicial equation at x = 0 of the differential equation

is

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 22

Let f be a three times continuously differentiable real valued function on (0, 5) such that its third derivative is a polynomial of degree ≤ 2 such that equals _______________

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 23

For real numbers   is exact for all polynomials of degree equals _______________

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 24

Raju has four fair coins and one fair dice. At first Raju tosses a coin. If the coin shows head then he rolls the dice and the number that dice shows is taken as his score. If the coin shows tail then he tosses three more coins and the total number of tails shown (including the first one) is taken as his score. If Raju tells that his score is 2 then the probability that he rolled the dice is (up to two decimal places) _______________

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 25

Let f be a continuously differentiable real valued function defined by

Then the value of a2b is _______________

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 26

A rectangular box without top cover having a square base is to be made from a sheet of 108 square meters. Then the largest possible volume of the box in cubic meters is ______________

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 27

Let  Then the trace of A1000 equals

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 28

Let denote the set of complex numbers and . Let g be the simple positively oriented circle is analytic in S and is given by

then the value of the contour integral

is

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 29

Let denote the three dimensional Euclidean space and for all 3
. If C is the curve described by the parametric equation then the value of the line integral is_______________

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 30

Let   u (x, t) satisfy the initial and boundary value problem

Then the value of is ______________________.

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 31

A parallelepiped of (2 m × 2 m) square cross-section and 10 m in length, is partially floating in water upto a depth of 1.2 m, with its longest side being horizontal. The specific gravity of the block is

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 32

The velocity field in a two-dimensional, unsteady flow is given by  The magnitude of acceleration  of a fluid particle located at x = 1 m, y = 1 m at the time t = 1 s, in m/s2, is

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 33

In a two-dimensional, incompressible and irrotational flow, fluid velocity (v) in the ydirection is given by The velocity (u) in the x-direction is

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 34

A two-dimensional laminar viscous liquid film of constant thickness (h) steadily flows down an incline as shown in figure. Acceleration due to gravity is g. If the velocity profile in the liquid film is given as, , the value of constant k is

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 35

A water jet of 100 mm diameter issuing out of a nozzle at a speed of 50 m/s strikes a vane and flows along it as shown in figure. The vane is attached to a cart which is moving at a constant speed of 20 m/s on a frictionless track. The jet is deflected at an angle of 30o. Take the density of water as 1000 kg/m3.  Neglecting the friction between the vane and the fluid, the magnitude of the force exerted by water on the cart in the x-direction, in N, is _____

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 36

Capillary waves are generated in the sea. The speed of propagation (C) of these waves is known to be a function of density (ρ), wave length (λ), and surface tension (σ). Assume, ρ and λ to be constant. If the surface tension is doubled, in the functional form of the relevant non-dimensional group, the percentage increase in propagation speed (C) is _______

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 37

Consider a fully developed, two-dimensional and steady flow of a viscous fluid between two fixed parallel plates separated by a distance of 30 mm. The dynamic viscosity of the fluid is 0.01 kg/m-s and the pressure drop per unit length is 300 Pa/m. The fluid velocity at a distance of 10 mm from the bottom plate, in m/s, is ________.

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 38

A 2.6 gram smooth table-tennis (ping-pong) ball has a diameter of 38 mm.  Density ( ρ ) of air is 1.2 kg/m3. Neglect the effect of gravity. Take coefficient of drag as 0.5. If the ball is struck with an initial velocity of 30 m/s, the initial deceleration, in m/s2, is _________.

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 39

On a flat plate, transition from laminar to turbulent boundary layer occurred at a critical Reynolds number (Recr). The empirical relations for the laminar and turbulent boundary layer thickness are given by respectively.  The ratio of laminar to turbulent boundary layer thickness, at the location of transition, is 0.3. The value of Recr is _______.

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 40

In a capillary tube of radius R = 0.25 mm, a fully developed laminar velocity profile is
defined as,
. In this expression,
is the dynamic viscosity of the fluid,  and r is the radial position from the centerline of the tube. If the flow rate through the tube is 1000 mm3/s, the viscosity of the fluid, in Pa-s, is ______________.

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 41

The skin friction coefficient for a turbulent pipe flow is defined as, , where is the wall shear stress and V is the average flow velocity. The value of Cf is empirically given by the relation: where Re is the Reynolds number. If the average flow velocity is 10 m/s, diameter of the pipe is 250 mm, kinematic viscosity of the fluid is 0.25×106 m2/s, and density of the fluid is 700 kg/m3, the skin friction drag induced by the flow over 1 m length of the pipe, in N, is ___________.

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 42

A (150 mm × 150 mm) square pillar is located in a river with water flowing at a velocity of   2 m/s, as shown in figure. The height of the pillar in water is 8 m. Take density of water as 1000 kg/m3 and kinematic viscosity as 1×10-6 m/s2. The coefficient of drag of the pillar is 2.0. The drag force exerted by water on the pillar in N is _______.

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 43

An orifice plate is used to measure flow rate of air (density = 1.23 kg/m3) in a duct of     250 mm diameter as shown in figure. The volume flow rate is 1 m3/s. Flow at sections 1 and 3 is uniform and section 2 is located at vena contracta. The diameter ratio, Dt/D1, is 0.66. The flow area at vena contracta, A2 = 0.65At, where At is area of the orifice. The pressure difference between locations 2 and 3 in N/m2 is ____________.

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 44

The stress ratio for a completely reversed cyclic loading during a fatigue test is

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 45

Minimum symmetry that a cubic crystal must possess is

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 46

If a material is repelled in an external magnetic field then it is

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 47

An electron makes a transition from the valence band to the conduction band in an indirect band gap semiconductor. Which one of the following is true?

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 48

Which one of the following is the characteristic of a screw dislocation?

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 49

The number of vibrational degrees of freedom for a non-linear triatomic molecule are

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 50

An atom is restricted to move in one dimension by making unit jumps either to the left or right, as shown in the figure. Assuming that a jump to the left or right is equally probable, the probability of the atom returning back to the starting point after four jumps is

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 51

For a two-dimensional solid, the variation of lattice specific heat as a function of temperature T (in K, at low temperatures) is given as: ���� = ������, where b is a constant. The value of n is ____________.

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 52

If the cation (C) to anion (A) radius ratio, is 0.6, then the coordination number (i.e., number of A ions surrounding a C ion) is likely to be ____________.

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 53

Match the invariant reactions in Column I with the names in Column II (L is liquid phase, and α , β, γ are solid phases). All reactions proceed to the right on cooling.

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 54

Consider the following anodic (oxidation) reaction in an acidic solution:

If 48250 Coulomb charge is produced during this anodic reaction then the amount of Mg (in g) dissolved into the solution is (Given: Faraday Constant =96500 C/mole of electrons, Atomic weight of Mg = 24)

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 55

An intrinsic semiconductor has conduction electron concentration, n = 1012 cm-3. The mobility of both electrons and holes are identical = 4 x 104 cm2 V-1 s-1. If a voltage of  100 V is applied on two parallel end faces of the cube (edge length 1 cm) through Ohmic contacts, the current through the cube would be (in mA)
(Given: charge of electron = 1.6 x 10 -19 C)

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 56

An infinite plate with a through-thickness crack of length 2 mm is subjected to a tensile stress (as shown in the figure). Assuming the plate to be linear elastic, the fracture stress is ____________ MPa (round off to the nearest whole number)

(Given: Fracture toughness, = 25 $$\sqrt m$$

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 57

A unidirectionally aligned carbon fibre reinforced epoxy composite  is loaded as shown in the figure. The volume fraction of the fibre  is 0.6. The Young’s modulus of the composite is ____________ GPa.

(Given: Young’s Modulus of the fibre and the matrix are 200 GPa  and 10 GPa, respectively)

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 58

A sintered sample was weighed in air and water using an analytical balance. The mass of the sample in air is 2.67 g and its apparent mass in water is 1.67 g. The density of the sample is __________ g cm-3 (give answer up to 2 decimal places)

(Given: Density of water = 1.00 g cm -3

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 59

The atoms in a gas laser have two energy levels such that a transition from the higher to the lower level releases a photon of wavelength 500 nm. If 7 x 1020 atoms are pumped into the upper level with 4 x 1020 atoms in the lower level, the amount of energy released in a single pulse is ____________ Joules (give answer up to 2 decimal places)

(Given: Planck’s constant, h = 6.6 x 10-34 J s;  speed of light, c = 3 x 108 m s -1

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 60

The speed of an electron is measured to be 300 m s-1 with an uncertainty of 0.01%. The fundamental accuracy with which the position of the electron can be determined simultaneously with the speed in the same experiment is _________ mm (give answer up to 2 decimal places)

(Given: Planck’s constant, h = 6.6 x 10 -34 J s;  mass of electron = 9.1 x 10 -31 kg)

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 61

When 3 identical non-interacting spin ½ particles are put in an infinite potential well, the ground state energy of the system is 18 meV. If instead, seven particles are put inside the potential well, the new ground state energy is ________ meV.

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 62

If the value of the integral (I) is 4, the value of the constant b is ___________ (give answer up to 2 decimal places).

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 63

X-ray diffraction pattern is obtained from FCC polycrystalline aluminium (lattice parameter = 0.405 nm) using Cr-Kα radiation of wavelength 0.229 nm. The maximum number of peaks that can be observed in the pattern is ____________.

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 64

The planar atomic density in the (110) plane of a BCC iron crystal is ____________ nm-2 (give answer up to 2 decimal places)   (Given: lattice parameter of iron is 0.287 nm)

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 65

Mild steel is carburized at 1300 K for 1 hour to obtain a certain case depth. Keeping the time as 1 hour, the case depth can be doubled by increasing the temperature to ______________K (round off to the nearest whole number)

(Given: Activation energy Q = 148 kJ mol -1,    Gas constant, R = 8.314 J mol -1 K -1

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 66

A thin cylinder (thickness, t and diameter, d) with closed ends is subjected to an internal pressure, p. The ratio of hoop stress to longitudinal stress developed in the wall of the cylinder is

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 67

A steel rod is fixed at one end and free at the other end. The coefficient of thermal expansion of the steel is α, and modulus of elasticity is E. If the temperature of the rod is increased by ∆T then the stress and strain developed in the rod are respectively

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 68

The effective lengths of the columns with ideal boundary conditions shown in Case-I, Case-II, and Case-III are respectively

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 69

At a point in a stressed body, sum of the normal stresses acting on perpendicular faces of an arbitrarily oriented plane stress element is always

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 70

The principal stresses on a plane stress element are shown in the figure. The maximum shear stress (in MPa) is

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 71

A rigid and thin L-shaped bracket is fixed to the wall at point B, and a force F is applied at point A as shown. For a given force F, the point B experiences the maximum clockwise moment when the inclination θ (in degrees) with the x-axis is……….[up to two decimal places].

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 72

A cantilever beam with length, L = 1 m, modulus of elasticity, E = 210 GPa, and area moment of inertia, I = 1.2 x 10-7m4 carries a concentrated mass m = 100 kg at its freeend. By idealizing it as a single degree-of-freedom system and neglecting the mass of the cantilever beam, the natural frequency (in rad/s) of small transverse oscillations of the mass m is …….. [up to two decimal places]

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 73

For a typical grade of steel, the value of modulus of elasticity (E) and Poisson’s ratio (ν) are 208 GPa and 0.3 respectively. The value of shear modulus (G) of the steel (in GPa) is …….

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 74

A tensile test is performed on a metallic specimen of diameter 8 mm and gauge length 50 mm. When the tensile load P reaches a value of 20 kN, the distance between the gauge marks increases by 0.09 mm. If the sample remains within the elastic limit, the modulus of elasticity (in GPa) of the test metal is………..[up to two decimal places]

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 75

A beam ABC is subjected to load P at its free end C as shown in the figure. The flexural rigidity of the beam is EI. The vertical support reaction at point B is

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 76

A horizontal effort P is applied to raise a block of weight W on a rough surface inclined at an angle θ with the horizontal. If μs is the coefficient of static friction between the block and the surface, the minimum effort P required to impend the upward motion of the block along the surface is

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 77

Three round bars of same material, equal lengths, and different cross-sectional dimensions are shown in the figures as Case-I, Case-II and Case-III. All the bars are clamped at the upper end, and a concentrated load P is applied at the lower end of each bar. If the elastic strain energy stored in the bar shown in Case-I is U1 then the elastic strain energy stored in Case-II and Case-III respectively is

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 78

A rigid uniform rod with mass m, length L and center of gravity G is freely suspended from a hinge as shown in the figure. The rod is given a small angular displacement θ in the counter-clockwise direction from the position in which it hangs vertically (θ = 0).  If g is the acceleration due to gravity, the natural frequency of oscillations (in rad/s) is

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 79

A cylindrical member, made up of ductile material, is subjected to pure torsion as shown in the figure. The failure plane (from Option-I to Option-IV) for ductile material as per maximum shear stress theory is represented by

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 80

A simply supported beam of span L is subjected to a couple Mo at a distance a from support A. Among the four options (Option-I to Option-IV) shown, the correct shear force diagram of the beam is

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 81

A circular shaft ABC of diameter, d and length, L is fixed at end A. It is subjected to the torsional moments at point B and point C as shown in the figure. The ratio of angle of twists at point B to point C is

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 82

A circular steel bar of diameter 10 mm is bent into the shape as shown in figure, and lies in x-z plane. A horizontal force P is applied along the positive z-direction as shown. The yield strength of the steel is 200 MPa. Neglecting the effect of transverse shear, the load P (in Newton) required to initiate yielding as per maximum shear stress theory of failure is…………[up to two decimal places]

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 83

Two sliders A and B, connected by a rigid link of length L, slide in two mutually perpendicular and frictionless guide-ways. At a particular instance, the slider A is moving in the downward direction with a speed of 0.05 m/s. At this instance, the magnitude of the velocity of slider B (in m/s) is ……[up to two decimal places]

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 84

A simply supported beam ABC is subjected to load as shown in the figure. The 20 kN load is applied at point B with the help of a welded bracket as shown. The beam has a rectangular cross-section of 15 mm width and 100 mm depth as shown. The maximum transverse shear stress developed in the beam (in MPa) is ……..[up to one decimal place]

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 85

A rigid rod ABC, in the form of a quarter-circular arc of radius R, is hinged at C and supported by a roller at B. A vertical force P is applied at the end A of the bar. For the reactions at B and C to be equal in magnitude, the value of the angle θ (in degrees) is ………. [up to two decimal places].

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 86

A marble of mass m slides along a frictionless linear slide AB kept in a vertical plane. The marble is released from point A with zero initial velocity, and it reaches point B under the action of gravity. Assuming the acceleration due to gravity to be 9.81 m/s2, the speed (in m/s) of the marble when it just reaches point B is………[up to two decimal places].

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 87

A horizontal force 10 N is applied at support B on the frame as shown in figure. Considering only bending deformation, the vertical reaction (in N) at support B is ………. [up to one decimal place]

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 88

Notation used: P : pressure, V : volume, T : temperature, s : specific entropy, h : specific enthalpy, Cp : molar heat capacity at constant pressure, Cv : molar heat capacity at constant volume, R : universal gas constant

Q. When a fixed mass of air-water vapour mixture is heated at constant pressure,

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 89

Notation used: P : pressure, V : volume, T : temperature, s : specific entropy, h : specific enthalpy, Cp : molar heat capacity at constant pressure, Cv : molar heat capacity at constant volume, R : universal gas constant

Q. For a reversible isothermal expansion of one mole of an ideal gas from state 1 to state 2, the magnitude of work done is

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 90

Notation used: P : pressure, V : volume, T : temperature, s : specific entropy, h : specific enthalpy, Cp : molar heat capacity at constant pressure, Cv : molar heat capacity at constant volume, R : universal gas constant

Q. The statement which is NOT a consequence of the first law of thermodynamics is

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 91

Notation used: P : pressure, V : volume, T : temperature, s : specific entropy, h : specific enthalpy, Cp : molar heat capacity at constant pressure, Cv : molar heat capacity at constant volume, R : universal gas constant

Q. For a refrigerator absorbing heat QL from a cold region and rejecting heat QH to a hot region, the coefficient of performance is written as

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 92

The value of the compressibility factor at the critical point evaluated using the vander Waals equation of state is

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 93

The vapour pressure of a liquid at 8 °C is 2.7 kPa. Its enthalpy of vaporization is constant and equal to 42700 kJ/kmol. Take R = 8.314 kJ/kmol.K. The temperature (in °C) at a vapour pressure of 13.5 kPa is

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 94

One kmol of an ideal gas (Cp = 21 kJ/kmol.K) undergoes a constant pressure process from 300 K to 500 K. The molar entropy of the gas at 300 K is 150 kJ/kmol.K. The molar entropy (in kJ/kmol.K) at 500 K (up to 1 decimal place) is ________.

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 95

A spring, having a spring constant of 350 kN/m, is initially compressed by 0.4 cm. The work required (in J) to compress it by another 0.6 cm (up to 1 decimal place) is ________.

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 96

An ideal gas has a molar mass of 40 kg/kmol. Take R = 8.314 kJ/kmol.K. At a pressure of 2 bar and a temperature of 300 K, the volume (in m3) of 1 kg of this gas (up to 2 decimal places) is ________.

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 97

Consider the following statements for an ideal gas undergoing a reversible non-flow process: P. If the process is adiabatic, the change in enthalpy of the gas is necessarily zero.
Q. If the process is adiabatic, the change in entropy of the gas is necessarily zero.
R. If the process is isothermal, the change in enthalpy of the gas is necessarily zero.
S. If the process is isothermal, the change in entropy of the gas is necessarily zero.
Which one of the following options is valid?

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 98

An ideal Otto cycle (O) and an ideal diesel cycle (D) have the same maximum temperature and reject equal amount of heat. Also, the working fluid enters at the same state before compression. One of the following statements always true about their efficiencies (��) is

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 99

A reversible engine receives 75 kJ/s of energy from a reservoir at 750 K and does 12 kJ/s of work. The heat is rejected to two reservoirs at 650 K and 550 K. The rate of heat rejection (in kJ/s) to the reservoir at 650 K is

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 100

A gas obeys the following equation of state:

where is molar volume, and a, b are constants with values a = 10-5 J.K/Pa2.kmol and 2b = 8x10- 2m3/kmol. Take Cp = 30 kJ/kmol.K. At 10 bar and 500 K, the value of the Joule-Thomson coefficient (in K/Pa) is

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 101

In an ideal Rankine cycle, steam enters the turbine at 10 MPa and 500 °C (ℎ = 3375.1 kJ/kg, �� = 6.5995 kJ/kg.K). It is cooled in the condenser at a pressure of 10 kPa. At 10 kPa, ℎf = 191.81 kJ/kg, ��f = 0.6492 kJ/kg.K, ℎg = 2583.9 kJ/kg and ��g = 8.1488 kJ/kg.K. The heat rejected in the condenser (in kJ/kg) is

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 102

Methane has compressibility factor value of 0.9 at reduced pressure of 1.0 and reduced temperature of 1.5. For propane, the critical temperature and pressure are 369.8 K and 42.48 bar, respectively. Take R = 8.314 kJ/kmol.K. Applying the principle of corresponding states, the molar volume of propane (in m3/kmol) at the same reduced pressure and temperature is

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 103

A rigid insulated vessel is divided into two compartments by a partition. One compartment contains 12 kg of oxygen at 200 kPa and 280 K. The other compartment contains 26 kg of carbon dioxide at 400 kPa and 360 K. The specific heats at constant volume in kJ/kg.K for oxygen and carbon dioxide are 0.662 and 0.653, respectively. The partition is removed and the gases are allowed to mix. Considering both gases are ideal, the final temperature (in K) of the mixture (up to 1 decimal place) is ________.

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 104

Moist air having 60% relative humidity, enters a steady-flow air-conditioning unit at 102 kPa and 30 °C. The volume flow rate of the moist air entering the unit is 0.1 m3/s. The moist air leaves the unit at 95 kPa and 15 °C with a relative humidity of 100%. Liquid condensate leaves the unit at 15 °C.

For air, specific heat at constant pressure is 1.004 kJ/kg.K and the specific gas constant is 0.287 kJ/kg.K.
Neglecting heat leakage to the surrounding, the magnitude of heat extracted (in kW) from the air stream (up to 2 decimal places) is __________.

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 105

Air at 150 kPa and 323 K is filled in a rigid vessel of 0.05 m3 capacity. For air, assumed as an ideal gas, specific heat at constant volume is 0.7163 kJ/kg.K and the specific gas constant is 0.287 kJ/kg.K. Neglect kinetic and potential energy changes. If 30 kJ of heat is added, the final temperature (in K) of air (up to 1 decimal place) is __________.

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 106

Superheated steam at 2 bar and 300 °C, with an enthalpy of 3072.1 kJ/kg, enters a horizontal adiabatic nozzle with negligible velocity and leaves at 0.2 bar as saturated vapour with an enthalpy of 2609.9 kJ/kg. Assuming steady flow and neglecting the potential energy changes, the exit velocity (in m/s) of the steam (up to 1 decimal place) is __________.

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 107

A given mass of a simple compressible substance undergoes a reversible cycle, as shown in the P-V diagram. The magnitude of the net work done during the cycle is 3 kJ. The pressure (in bar) at point C (up to 1 decimal place) is ________

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 108

One kmol of an ideal gas at 300 K and 10 bar is reversibly heated in a constant volume process to 500 K. It is then reversibly and isothermally expanded to 2 bar. Take Cv = 20.8 kJ/kmol.K and R = 8.314 kJ/kmol.K. The total heat supplied (in kJ) to the gas (up to 1 decimal place) is ________.

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 109

A rigid container is completely filled with a liquid having a constant isothermal compressibility of 1.09 x10-4 bar-1 and a constant coefficient of volume expansion of  1.12 x10-3 K-1

The liquid is initially at 300 K and 1 bar. Heat is supplied to the liquid to raise its temperature to 350 K. Assuming that no phase change occurs, the final pressure (in bar) of the liquid (up to 1 decimal place) is ________.

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 110

Which one of the following polymers occurs naturally?

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 111

The order of average molecular weights of a polymer is

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 112

Rubbers are a class of polymer known for

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 113

Nylon 6 is manufactured from

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 114

Storage modulus and tan δ of a polymer are experimentally measured by

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 115

A plastic bucket is manufactured by

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 116

The monomers, A and B with reactivity ratios rA and rB, form alternate copolymers when,

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 117

The degree of polymerization of a poly(methyl methacrylate) sample having number average molecular weight of 1,50,000 g/mol is___________. (C = 12, H = 1, O = 16 g/mol).

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 118

If the heat of fusion of 100 % crystalline polyethylene is 290 mJ/mg, a sample of polyethylene with heat of fusion of 141 mJ/mg will have_______ % crystallinity.

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 119

Match the following:

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 120

Match the following:

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 121

Flexible PVC tubes are used for watering. If some organic solvents are passed through this tube, it becomes stiff. This is due to the fact that the organic solvents

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 122

Match the following:

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 123

Match the following:

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 124

A plot of strain (%) versus time of a polymer is given below. Based on this plot and the properties as mentioned below, find out the correct combination.

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 125

The plot shows apparent viscosity versus shear rate of Newtonian, Dilatent and Pseudoplastic fluids. Based on this plot and the fluid behaviour as mentioned below, find out the correct combination.

1 = Dilatent fluid; 2 = Newtonian fluid, 3 = Pseudoplastic fluid

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 126

Plot of the modulus versus temperature of different types of polymers is given below. Based on this plot and the nature of the polymers as mentioned below, find out the correct combination.

1 = An amorphous polymer of high molecular weight having entanglements
2 = An amorphous polymer of moderate molecular weight
​4 = Semi-crystalline polymer

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 127

The Tg of homopolymers of A and B are +100 oC and  -70 oC respectively. The Tg of a random copolymer of A and B having 40 wt% A and 60 wt% B is _________oC.

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 128

The number average molecular weight of a polymer prepared from HO(CH2)14COOH  is 24,000 g/mol. The conversion of the monomer required to reach the above molecular weight is__________%. (C = 12, H = 1, O = 16 g/mol).

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 129

Glass fibers in nylon provide reinforcement. The modulus of elasticity for each component of the composite is; Eglass = 10.5 x 106 psi; Enylon = 0.4 x 106 psi. If the nylon contains   30 vol % E-glass, the fraction of the applied force is carried by the glass fiber is__________. (Assume that both glass fiber and nylon have equal strain).

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 130

The solubility parameter of a polymer having cohesive energy density (Ecoh) 43870 J/mol and molar volume (V) 136 cm3/mol is _________ (J/cm3)1/2.

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 131

The heat of polymerization of styrene is 20 Kcal/mol. Heat of 5 x105 Kcal will be released on polymerization of __________ Kg of styrene (C = 12 and H = 1 g/mol).

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 132

Which of the following is oil soluble pigment present in fruits and vegetables?

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 133

Which of the following represent the group of saturated fatty acids?

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 134

The anti-nutritional factor present in fava bean is

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 135

Irradiation carried out to reduce viable non-spore forming pathogenic bacteria using a dose between 3 to 10 kGy is called

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 136

Identify the correct statement related to the viscosity of Newtonian fluids from the following

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 137

Adult male Wistar rats were fed with a protein based diet. Total 150 g of protein was ingested per animal. If the average weight increased from 110 g to 350 g after the end of the experiment, the Protein efficiency ratio of the given protein would be _______. (up to two decimal points)

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 138

The initial moisture content of a food on wet basis is 50.76%. Its moisture content (%) on dry basis is _______.(up to two decimal points)

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 139

The oxygen transmission rate through a 2.54 x 10-3 cm thick low density polyethylene film with air on one side and inert gas on the other side is 3.5 x 10-6 mL cm-2 s-1. Oxygen partial pressure difference across the film is 0.21 atm. The permeability coefficient of the film to oxygen is _______ x 10-11 mL (STP) cm cm-2 s-1 (cm Hg)-1.

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 140

Ambient air at 30◦C dry bulb temperature and 80% relative humidity was heated to a dry bulb temperature of 80◦C in a heat exchanger by indirect heating. The amount of moisture gain (g kg-1 dry air) during the process would be _______.

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 141

Match the commodity in Group I with the bioactive constituent in Group II

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 142

Match the process operation in Group I with the separated constituent  in Group II

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 143

Match the spoilage symptom in Group I  with the causative microorganism in Group II

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 144

Match the fermented product in Group I with the base  material in Group II

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 145

Match the operation  in Group I with the process in Group II

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 146

Out of 7 principles of HACCP system, 4 are listed below. Arrange these principles in the order in which they are applied.
(P) Conduct a hazard analysis
(Q) Establish monitoring process
(R) Establish critical limit
(S) Establish record keeping and documentation process

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 147

Apple juice of 10% total solids (TS) is being concentrated in a single effect evaporator working with a surface condenser to 40% TS under a vacuum of 20 kPa. After some time the vacuum pump stops but the evaporation process continued. Choose the combination of possible implications from the following.
(P) Product quality is affected
(Q) Substantial increase in thermal energy requirement
(R) Decrease in the rate of evaporation

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 148

Identify an example of a classical diffusional mass transfer process without involving heat, among the following.

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 149

For an enzyme catalyzed reaction  S  →  P , the kinetic parameters are:

The Km of the enzyme in µM will be _______.(up to one decimal points)

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 150

A microbial sample taken at 10 AM contained 1x105 CFU/mL. The count reached to 1x1010 CFU/mL at 8 PM of the same day. The growth rate (h-1) of the microorganism would be _______.(up to two decimal points)

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 151

Black pepper is ground from an equivalent particle size of 6 mm to 0.12 mm using a 10 hp motor. Assuming Rittinger’s equation and that 1 hp = 745.7 W, the power (hp) of motor required to fine grind black pepper to 0.08 mm would be _______.(up to two decimal points)

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 152

Green pea (average diameter 0.8 cm) is frozen in a blast freezer operating at -40◦C and  with a surface heat transfer coefficient of  30 W m-2 K-1. The thermal conductivity of pea is 2.5 W m-1K-1, and latent heat of crystallization is 2.74 x 102 kJ kg-1. If the freezing point of pea is -1◦C and the density is 1160 kg m-3, the freezing time in minutes will be _______.(up to two decimal points)

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 153

The rate of heat transfer from a metal plate is 1000 W m-2. The surface temperature of the plate is 120C and ambient temperature is 20C. The convective heat transfer coefficient (W m-2 C-1) using the Newton’s law of cooling will be _______.

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 154

The most abundant gas in the atmosphere among inert gases is

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 155

The pair of variables that always exhibit monotonic decrease with height in the atmosphere is

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 156

Correct order of the maximum vertical extent of atmospheric circulation cells is

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 157

Analysis of an atmospheric variable shows prominent modes at 5, 40 and 1460 days. These modes correspond respectively to

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 158

Atmospheric vertical profile of temperature is measured by radiosonde. Equivalent instruments for measuring ocean temperature profile among the following are:
(P) drifting buoy
(Q) ARGO float
(R) current mooring
(S) XBT

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 159

When deep water sinks in the North Atlantic and moves away from where it formed, it gets

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 160

The speed of sound in the ocean depends on

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 161

In a numerical weather prediction model with a horizontal grid resolution of 50 km, convective cloud processes are parameterized, because

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 162

Figure below shows SST anomaly (in °C). It is associated with the phenomenon known as

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 163

For an inviscid and barotropic ocean of constant depth (D), a water parcel with initial vorticity 2Ω is displaced from the equator to the north pole. Latitudinal variation of the parcel vorticity (ζ ) is well represented by the curve

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 164

A wave progresses up an estuary of decreasing water depth. If friction is neglected, then

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 165

In the Ekman flow limit, directions of ocean surface current and the geostrophic wind are

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 166

P and Q respectively describe flow fields corresponding to

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 167

On the summer solstice day, the maximum incident shortwave radiation at the top of the atmosphere over the equator (up to one decimal place) is __________ W m–2. (Take solar constant as 1368 W m–2).

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 168

In an isothermal atmosphere having a temperature of 15oC, the height at which pressure decreases to 1/10 of its value at the surface is __________ km. (Give the answer to two decimal places.) Take g = 9.8 m s–2, gas constant R = 287 J kg–1 K–1

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 169

At 30°N and 700 hPa pressure level, wind field is in gradient balance. If the gradient wind speed is 50 m s–1 and radius of curvature of the flow is 50 km, the corresponding geostrophic wind speed is __________ m s–1. (Give the answer to one decimal place.) Take the angular velocity of the Earth as 7.3x10–5 s–1

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 170

In a tropical cyclone over the Pacific Ocean, surface pressure at 500 km from the cyclone centre is 1000 hPa. Surface pressure at the centre is 900 hPa. Sea surface temperature and surface air temperature remain constant at 28oC and 27oC, respectively. Difference in potential temperature between 500 km and cyclone centre is __________ K. (Give the answer to two decimal places.) Take g = 9.8 m s–2, Cp = 1005 J kg–1 K–1, gas constant R = 287 J kg–1 K–1

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 171

A cloud forms by the lifting of moist air from the surface with the initial conditions To = 30oC, RH = 80% and Po = 1005 hPa. If the vapour pressure of this parcel at 500 hPa is 6.5 hPa, the liquid water content of the parcel if no precipitation takes place is __________ gm kg –1. (Give the answer to one decimal place.) Saturation vapour pressure of water at 30oC is 42.43 hPa.

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 172

A numerical model of the atmosphere uses sigma (��) coordinate system in vertical. At  locations P and Q, surface pressures are 1005 hPa and 500 hPa, respectively. Absolute difference in the heights of �� = 0.9 level between these locations is __________ meters. (Give the answer to one decimal place.) Layer mean temperatures at P and Q are 300 K and 270 K, respectively. (Take g = 9.8 m s–2 gas constant R = 287 J kg –1 K–1)

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 173

If difference in sea surface elevation is 1 m in 100 km at 30° N latitude, the corresponding geostrophic current is __________ m s–1. (Give the answer to one decimal place.) Take g = 9.8 m s–2 and angular velocity of the Earth = 7.3x10–5 s–1.

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 174

If wind speed over ocean surface is 10 m s–1, air-sea interface momentum flux is __________ N m–2. (Give the answer to two decimal places.) Surface air temperature and pressure are 27°C and 1000 hPa, respectively. Take drag coefficient as 0.001 and gas constant R = 287 J kg –1 K–1.

Engineering Sciences - (XE) 2018 GATE Paper (Practice Test) - Question 175

Let Lx, Ly be length scales in x- and y-directions and corresponding mass transports are Mx and My. The ratio of Mx and My (to nearest integer) is __________ , if the ratio of Lx and Ly is 10 and vertical velocity is zero.

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