# XE Engineering Science- 2016 GATE Paper (Practice Test)

## 155 Questions MCQ Test GATE Past Year Papers for Practice (All Branches) | XE Engineering Science- 2016 GATE Paper (Practice Test)

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Attempt XE Engineering Science- 2016 GATE Paper (Practice Test) | 155 questions in 180 minutes | Mock test for GATE preparation | Free important questions MCQ to study GATE Past Year Papers for Practice (All Branches) for GATE Exam | Download free PDF with solutions
QUESTION: 1

Solution:
QUESTION: 2

Solution:
QUESTION: 3

### Pick the odd one out in the following: 13, 23, 33, 43, 53

Solution:
QUESTION: 4

R2D2 is a robot. R2D2 can repair aeroplanes. No other robot can repair aeroplanes.
Which of the following can be logically inferred from the above statements?

Solution:
QUESTION: 5

If |9y−6| =3, then y2 −4y/3 is

Solution:
*Answer can only contain numeric values
QUESTION: 6

Q. 6 – Q. 10 carry two marks each.

Q.

The following graph represents the installed capacity for cement production (in tonnes) and the actual production (in tonnes) of nine cement plants of a cement company. Capacity utilization of a plant is defined as ratio of actual production of cement to installed capacity. A plant with installed capacity of at least 200 tonnes is called a large plant and a plant with lesser capacity is called a small plant. The difference between total production of large plants and small plants, in tonnes is ____________ (Important : you should answer only the numeric value)

Solution:
QUESTION: 7

A poll of students appearing for masters in engineering indicated that 60 % of the students believed that mechanical engineering is a profession unsuitable for women. A research study on women with masters or higher degrees in mechanical engineering found that 99 % of such women were successful in their professions.
Which of the following can be logically inferred from the above paragraph?

Solution:
QUESTION: 8

Sourya committee had proposed the establishment of Sourya Institutes of Technology (SITs) in line with Indian Institutes of Technology (IITs) to cater to the technological and industrial needs of a developing country.

Which of the following can be logically inferred from the above sentence?

Based on the proposal,
(i) In the initial years, SIT students will get degrees from IIT.
(ii) SITs will have a distinct national objective.
(iii) SIT like institutions can only be established in consultation with IIT.
(iv) SITs will serve technological needs of a developing country.

Solution:
QUESTION: 9

Shaquille O’ Neal is a 60% career free throw shooter, meaning that he successfully makes 60 free throws out of 100 attempts on average. What is the probability that he will successfully make exactly 6 free throws in 10 attempts?

Solution:
*Answer can only contain numeric values
QUESTION: 10

The numeral in the units position of 211870 + 146127 × 3424 is _____.

(Important : you should answer only the numeric value)

Solution:
QUESTION: 11

Q. 11 – Q. 17 carry one mark each.

Q.

A company records heights of all employees. Let X and Y denote the errors in the average height of
male and female employees respectively. Assume that X ~ N(0, 4) and Y ~ N(0, 9) and they are
independent. Then the distribution of Z = (X + Y)/2 is

Solution:
QUESTION: 12

The volume of the solid obtained by revolving the curve y2 = x , 0 ≤ x ≤ 1 around y-axis is

Solution:
*Answer can only contain numeric values
QUESTION: 13

Let y(x) be the solution of the initial value problem Find the value of (Important : you should answer only the numeric value)

Solution:
QUESTION: 14

Which of the following is a quasi-linear partial differential equation?

Solution:
QUESTION: 15

Let P(x) and Q(x) be the polynomials of degree 5, generated by Lagrange and Newton
interpolation methods respectively, both passing through given six distinct points on the xy-plane.
Which of the following is correct?

Solution:
QUESTION: 16

The Laurent series of f(z) = 1/(z3 − z4) with center at z = 0 in the region |z| > 1 is

Solution:
QUESTION: 17

The value of the surface integral given by x2 + y2 + z2 = 1, where denotes the outward unit normal, is

Solution:
*Answer can only contain numeric values
QUESTION: 18

Q. 18 – Q. 21 carry two marks each.

Q.

A diagnostic test for a certain disease is 90% accurate. That is, the probability of a person having
(respectively, not having) the disease tested positive (respectively, negative) is 0.9. Fifty percent of
the population has the disease. What is the probability that a randomly chosen person has the
disease given that the person tested negative?

Solution:
QUESTION: 19

Let Which of the following is correct?

Solution:
*Answer can only contain numeric values
QUESTION: 20

Let f(x) = 2x3 − 3x2 + 69, −5 ≤ x ≤ 5. Find the point at which f attains the global maximum.

(Important : you should answer only the numeric value)

Solution:
*Answer can only contain numeric values
QUESTION: 21

Calculate ???? varying from 0 to 1 and Solution:
*Answer can only contain numeric values
QUESTION: 22

Q. 22 – Q. 30 carry one mark each.

Q.

In the parallel-plate configuration shown, steady-flow of an incompressible Newtonian fluid is established by moving the top plate with a constant speed, U0 = 1m/s. If the force required on the top plate to support this motion is 0.5 N per unit area (in m2) of the plate then the viscosity of the fluid between the plates is __________ N-s/m2 Solution:
QUESTION: 23

For a newly designed vehicle by some students, volume of fuel consumed per unit distance travelled (qf in m3/m) depends upon the viscosity (μ) and density (ρ) of the fuel and, speed (U) and size (L) of the vehicle as where C is a constant. The dimensions of the constant C are

Solution:
*Answer can only contain numeric values
QUESTION: 24

A semi-circular gate of radius 1m is placed at the bottom of a water reservoir as shown in figure below. The hydrostatic force per unit width of the cylindrical gate in y-direction is _______ kN. The gravitational acceleration, g = 9.8 m/s2 and density of water = 1000 kg/m3. Solution:
*Answer can only contain numeric values
QUESTION: 25

Velocity vector in m/s for a 2-D flow is given in Cartesian coordinate Symbols bear usual meaning. At a point in the flow field, the x- and y-  components of the acceleration vector are given as m/s2 and -0.5 m/s2, respectively. The velocity magnitude at that point is ________ m/s.

Solution:
QUESTION: 26

If is velocity potential and is stream function for a 2-D, steady, incompressible and
irrotational flow, which one of the followings is incorrect?

Solution:
QUESTION: 27

The flow field shown over a bluff body has considerably curved streamlines. A student measures
pressures at points A, B, C, and D and denotes them as PA, PB, PC, and PD respectively. State which
one of the following statements is true. The arrow indicates the freestream flow direction. Solution:
*Answer can only contain numeric values
QUESTION: 28

A 2-D incompressible flow is defined by its velocity components in m/s as and If the value of the constant c is equal to 0.1 m2/s, the numerical value of vorticity at the point x=1 m and y=2 m is  ______________ s-1

Solution:
QUESTION: 29

T wo flow configurations are shown below for flow of incompressible, viscous flow. The inlet
velocity for the diverging nozzle (Fig (i)) and free-stream velocity for flow past the bluff body
(Fig(ii)) is constant. Points A and B are separation points and flow is laminar. The relation
regarding velocity gradients at point A and B is (y is the direction normal to the surface at the point
of separation) Solution:
*Answer can only contain numeric values
QUESTION: 30

Consider a fully developed, steady, incompressible, 2-D, viscous channel flow with uniform suction and blowing velocity v0 , as shown in the figure given below. The centerline velocity of the channel is 10 m/s along the x-direction. If the value of  vat both the walls is 1 m/s, the value of the y-component of velocity inside the flow field is __________ m/s. Solution:
*Answer can only contain numeric values
QUESTION: 31

Q. 31 – Q. 44 carry two marks each.

Q.

Exhaust from a kitchen goes into the atmosphere through a tapered chimney as shown. The area of cross-section of chimney at location-1 is twice of that at location-2. The flow can be assumed to be inviscid with constant exhaust density of 1 kg/m3 and acceleration due to gravity, g = 9.8 m/s2. If the steady, uniform exhaust velocity at location-1 is U = 1m/s, the pressure drop across the chimney is ________ Pa. Solution:
*Answer can only contain numeric values
QUESTION: 32

A jet of diameter 20 mm and velocity 6 m/s coming out of a water-tank standing on a frictionless cart hits a vane and gets deflected at an angle 45o as shown in the figure below. The density of water is 1000 kg/m3. Neglect all minor and viscous losses. If the cart remains stationary, the magnitude of tension in the supporting string connected to the wall is ________ N. Solution:
*Answer can only contain numeric values
QUESTION: 33

A block is floating at the oil-water interface as shown. The density of oil is two-thirds of that of water. Given that the density of the block is 800 kg/m3 and that of water is 1000 kg/m3, the fraction of the total height of block in oil is ________. Solution:
*Answer can only contain numeric values
QUESTION: 34

A horizontal pipe is feeding water into a reservoir from the top with a time-dependent volumetric flow-rate, Q (m3/h)= 1+0.1 x t where t is time in hours. The area of the base of the reservoir is 0.5 m2. Assuming that initially the reservoir was empty, the height of the water level in the reservoir after 60 minutes is __________ m.

Solution:
QUESTION: 35

Velocity field of a 2-D steady flow is provided as The equation of the streamlines of this flow is

Solution:
QUESTION: 36

Velocity potential and stream function in polar coordinates ( r, θ) for a potential flow over a cylinder with radius R is given as respectively. Here,  U denotes uniform freestream velocity, and θ is measured counter clockwise as shown in the figure. How does the velocity magnitude, , over the surface of the cylinder will vary? Solution:
*Answer can only contain numeric values
QUESTION: 37

Consider a laminar flow over a flat plate of length = 1m. The boundary layer thickness at the end of the plate is δfor water, and δa  for air for the same freestream velocity. If the kinematic viscosities of water and air are 1 x 10-6  m2/s and 1.6 x 10-5 m2/s.respectively, the numerical value of the ratio, δwa is _________.

Solution:
QUESTION: 38

Prototype of a dam spillway ( a structure used for controlled release of water from the dam) has characteristic length of 20m and characteristic velocity of 2 m/s. A small model is constructed by keeping Froude number same for dynamic similarity between the prototype and the model. What is the minimum length-scale ratio between prototype and the model such that the minimum Reynolds' number for the model is 100? The density of water is 1000 kg/m3 and viscosity is 10-3 Pa-s.

Solution:
*Answer can only contain numeric values
QUESTION: 39

An orifice meter, having orifice diameter of is placed in a water pipeline having flow rate, Qoct = 3 x 10-4 m3/s. The ratio of orifice diameter to pipe diameter is 0.6. The contraction coefficient is also 0.6. The density of water is 1000 kg/m3.  If the pressure drop across the orifice plate is 43.5kPa, the discharge co-efficient of the orifice meter at this flow Reynolds number is ____________.

Solution:
QUESTION: 40

Consider the following figures shown below. The objects are marked as A1, A2, B1, B2 and C1, C2 and the flow directions over these objects are shown by the respective arrow placed to the left of the object. Freestream velocities are same for all the cases. Amongst these objects, A1, A2, B1 and C1 are having smooth surfaces while B2 and C2 are having rough surfaces. Reynolds number is such that flow over rough surfaces become turbulent and flow over smooth surfaces can be considered laminar. All the airfoils can be considered as thin slender airfoil. Among the statements (i) to (vi) made about the drag of these objects which is/are correct?

(i) Drag of object A1 is less than drag of object A2.

(ii) Drag of Object A1 and A2 are same.

(iii) Drag of Object B1 is more than drag of object B2.

(iv) Drag of object B2 is more than drag of object B1.

(v) Drag of Object C1 is more than drag of object C2.

(vi) Drag of object C2 is more than drag of object C1. Solution:
*Answer can only contain numeric values
QUESTION: 41

Consider 2-D, steady, incompressible, fully developed flow of viscous, Newtonian fluid through two stationary parallel plates, in Cartesian co-ordinate (x,y,z) system. Assume plates are very long in x-direction, wide in z-direction (also there is no variation of velocity in z direction) and distance between them is 2h. The velocity in such a channel is given as . The origin y = 0 is located at the center between the plates. If h = 48 mm and Umax  = 100mm/s difference between values of stream functions passing through y = 0 and y = h/2 is __________ mm2/s.

Solution:
*Answer can only contain numeric values
QUESTION: 42

Consider 2-D, steady, incompressible, fully developed flow of viscous, Newtonian fluid through two stationary parallel plates, in Cartesian co-ordinate (x,y,z) system. Assume plates are very long in x-direction, wide in z-direction (also there is no variation of velocity in z direction) and distance between them is 2h. The velocity in such a channel is given as . The origin y = 0 is located at the center between the plates. If h = 48 mm and Umax  = 100mm/s difference between values of stream functions passing through y = 0 and y = h/2 is __________ mm2/s.

Solution:
*Answer can only contain numeric values
QUESTION: 43

A pump is used to deliver water to an overhead tank at a flow rate of Q=4 x 10-3m3/s. The pump adds1.6 kW to water. If the density of water is 1000 kg/m3 and acceleration due to gravity is 10 m/s2, the pump head added to the flow is _________ m.

Solution:
*Answer can only contain numeric values
QUESTION: 44

Water is discharged at atmospheric pressure from a large reservoir through a long pipe of diameter d and length L. The height of the free surface of the reservoir from the discharge point is h meters. The Darcy's friction factor of the pipe is 0.002. Neglect the velocity inside the reservoir as the reservoir is very large. Given, L = 20m, d = 40mm, density of water = 1000kg/m3 and flow rate is Q=4π x 10-3m3/s. Assume gravitational acceleration, g = 10 m/s2. The value of h is _______m

Solution:
QUESTION: 45

Q. 45 – Q. 53 carry one mark each.

Q.

Energy Dispersive Spectroscopy (EDS) in a typical scanning electron microscope enables
elemental identification by collecting and examining which of the following:

Solution:
QUESTION: 46

Which of the following rotational symmetry is forbidden in a perfectly periodic 3-dimensional
lattice?

Solution:
QUESTION: 47

Which of the following thermodynamic properties shows a discontinuity during a second-order
phase transition?

Solution:
QUESTION: 48

Cross slip is easily promoted in metals having

Solution:
QUESTION: 49

For a typical metal at room temperature and atmospheric pressure, the Fermi energy is defined as
the energy level for which the probability of occupancy is:

Solution:
*Answer can only contain numeric values
QUESTION: 50

Number of elements in a tensor of rank 4 is _________________.

(Important : you should answer only the numeric value)

Solution:
QUESTION: 51

Which one of the following effects is the working principle of a thermocouple?

Solution:
*Answer can only contain numeric values
QUESTION: 52

At equilibrium, the maximum number of phases that can coexist in a ternary system at constant
pressure is ____________.

(Important : you should answer only the numeric value)

Solution:
QUESTION: 53

Defect-free single crystal alumina (sapphire) is

Solution:
QUESTION: 54

Q. 54 – Q. 65 carry two marks each.

Q.

Match the following processes and the products obtained: Solution:
*Answer can only contain numeric values
QUESTION: 55

In a diffraction experiment, monochromatic X-rays of wavelength 1.54 Å are used to examine a
material with a BCC structure. If the lattice parameter is 4.1 Å, the angular position θ of the first
diffraction peak is ________________ degrees.

Solution:
*Answer can only contain numeric values
QUESTION: 56

The yield strength of a ferritic steel increases from 120 MPa to 150 MPa when the grain size is
decreased from 256 μm to 64 μm. When the grain size is further reduced to 16 μm, the expected
yield strength is __________________ MPa

(Important : you should answer only the numeric value)

Solution:
*Answer can only contain numeric values
QUESTION: 57

A direct bandgap semiconductor has a bandgap of 1.8 eV. The threshold value of the wavelength
BELOW which this material will absorb radiation is__________________ Å.
(Given: Planck’s constant, h = 6.626 × 10−34 J s, the charge of an electron, e = 1.6 × 10−19 C, and
speed of light, c = 3 × 108 m s−1)

Solution:
*Answer can only contain numeric values
QUESTION: 58

A half cell consisting of pure Ni immersed in an aqueous solution containing Ni2+ ions of unknown
concentration, is galvanically coupled with another half cell consisting of pure Cd immersed in a
1M aqueous solution of Cd2+ ions. The temperature is 25 oC and pressure is 1 atm. The standard
electrode reduction potentials of Ni and Cd are −0.250 V and −0.403 V, respectively. The voltage
of the cell is found to be zero. The concentration of Ni2+ in the solution is ____________ × 10−6 M.
(Given: Universal gas constant, R = 8.31 J mol−1K−1, Faraday’s constant, F = 96500 C mol−1)

Solution:
QUESTION: 59

Match the type of magnetism given in Group 1 with the material given in Group 2: Solution:
*Answer can only contain numeric values
QUESTION: 60

Gallium is to be diffused into pure silicon wafer such that its concentration at a depth of 10−3 cm
will be one half the surface concentration. Given that the diffusion coefficient (D) of gallium in
silicon at 1355 °C is 6×10−11 cm2 s−1, the time the silicon wafer should be heated in contact with
gallium vapour at 1355 °C is _______________ s.
(Given: erf(0.5) ≅ 0.5)

Solution:
*Answer can only contain numeric values
QUESTION: 61

A batch of spherical titania nanoparticles, uniform in size, has a specific surface area of 125 m2 g−1.
If the density of titania is 4.23 g cm−3, the diameter of the particles is _______________ nm.

Solution:
*Answer can only contain numeric values
QUESTION: 62

Given the probability distribution function The probability that the random variable x takes a value between 1 and √5 is _______________.

(Important : you should answer only the numeric value)

Solution:
*Answer can only contain numeric values
QUESTION: 63

In the vulcanization of 50 g of natural rubber, 10 g of sulfur is added. Assuming the mer to S ratio
is 1:1, the maximum percentage of cross-linked sites that could be connected is ___________%.
(Given: atomic weight of S is 32 amu and molecular weight of a mer of natural rubber is 68 amu)

Solution:
QUESTION: 64

Match the heat treatment process of steels given in Group 1 with the microstructural feature given
in Group 2: Solution:
QUESTION: 65

Match the heat treatment process of steels given in Group 1 with the microstructural feature given
in Group 2: Solution:
QUESTION: 66

In the photoelectric effect, electrons are ejected

Solution:
*Answer can only contain numeric values
QUESTION: 67

The angle between  and  directions in the cubic system is ______________ degrees

Solution:
QUESTION: 68

Q. 68 – Q. 76 carry one mark each.

Q.

A single degree of freedom vibrating system has mass of 5 kg, stiffness of 500 N/m and damping
coefficient of 100 N-s/m. To make the system critically damped

Solution:
QUESTION: 69

A “L” shaped robotic arm AB is connected to a motor at end A and a magnetic gripper at B as
shown in the figure. If the arm is rotating with an angular velocity of 2 rad/s and an angular
acceleration of 3 rad/s2, the magnitude of the acceleration (in m/s2) of the end B is Solution:
*Answer can only contain numeric values
QUESTION: 70

A block of weight 100 N is in static equilibrium on an inclined plane which makes an angle 15º
with the horizontal. The coefficient of friction between the inclined plane and the block is 0.3. The
magnitude of friction force (in N) acting on the block is __________ Solution:
QUESTION: 71

The lower end A of the rigid bar AB is moving horizontally on the floor towards right with a
constant velocity of 5 m/s and the point B is sliding down the wall. The magnitude of the velocity of point B at the instant θ = 30º is Solution:
*Answer can only contain numeric values
QUESTION: 72

The state of plane stress at a point in a body is shown in the figure. The allowable shear stress of the
material of the body is 200 MPa. According to the maximum shear stress theory of failure the
maximum permissible value of σ (in MPa) is __________ (Important : you should answer only the numeric value)

Solution:
QUESTION: 73

For a slender steel column of circular cross-section the critical buckling load is Pcr . If the diameter
of the column is doubled (keeping other material and geometrical parameters same), then the
critical buckling load of the column is

Solution:
*Answer can only contain numeric values
QUESTION: 74

A closed thin cylindrical pressure vessel having an internal diameter of 1000 mm and a thickness of 10 mm is subjected to an internal pressure of 4 MPa. The maximum shear stress (in MPa) induced
in the cylinder is __________ (neglect the radial stress).

(Important : you should answer only the numeric value)

Solution:
*Answer can only contain numeric values
QUESTION: 75

A solid circular shaft subjected to pure torsion develops a maximum torsional shear stress of
120MPa. Keeping the torsional moment same, if the diameter of the shaft is doubled then the
maximum shear stress (in MPa) induced in the shaft is __________

(Important : you should answer only the numeric value)

Solution:
*Answer can only contain numeric values
QUESTION: 76

On a single straight track, a vehicle of mass 500 kg moving with a velocity of 25 m/s strikes
another vehicle of mass 250 kg moving with a velocity 10 m/s in the same direction. After the
impact, if both the vehicles stick together, the common velocity (in m/s) with which both the
vehicles will move together is __________

(Important : you should answer only the numeric value)

Solution:
*Answer can only contain numeric values
QUESTION: 77

Q. 77 – Q. 89 carry two marks each.

Q.

A system with three forces and a concentrated moment at A is shown in the figure. The system is replaced by an equivalent force system with a single force and a single couple at point ‘O’. The
magnitude (in N-m) of the equivalent couple at ‘O’ is __________ (Important : you should answer only the numeric value)

Solution:
*Answer can only contain numeric values
QUESTION: 78

A block A on a smooth inclined plane is connected to block B as shown in the figure using an inextensible cord which pass over a mass-less and friction-less pulley. Initially, the block B is
constrained to be at rest. If the constraint on block B is released, the magnitude of velocity (in m/s) of the block ‘B’ after 2 seconds from its release is __________ (assume g =10 m/s2). (Important : you should answer only the numeric value)

Solution:
QUESTION: 79

The vibrating system shown in the figure carries a mass of 10 kg at the free end, where the static deflection is 1 mm. This system is to be replaced by an equivalent vibrating spring mass system having equivalent mass of 2 kg (assume g =10 m/s2). The natural frequency (in rad/s) and the stiffness (in kN/m) of the equivalent system respectively are Solution:
QUESTION: 80

A beam having flexural rigidity EI and length L is subjected to a concentrated end moment 0 M as
shown in the figure. For , the strain energy stored
(in kN-m) in the beam and the rotation (in rad) at the free end respectively are Solution:
QUESTION: 81

At a point ‘O’ on a metal sheet a square OABC of a unit side length is drawn. The square
undergoes a small uniform elastic deformation and deforms to OA*B*C* (dashed lines) as shown
in the figure. All dimensions are in mm and the figure is not to scale. The normal strains εx ,  εy
and shear strain γxy developed in the square respectively are Solution:
QUESTION: 82

Mohr’s circle for the state of plane stress at a point is shown in the figure. Unit of stress is MPa and
the circle is drawn not to scale. Which one of the following options (stress values in MPa) is true? Solution:
*Answer can only contain numeric values
QUESTION: 83

As shown in the figure, links AB and CD support the rigid member BD. Links AB and CD are
made of aluminum alloy (E= 100GPa) and each has a cross-sectional area of 100mm2. All the
members are pin connected and all the dimensions are in mm. Neglecting the weights of the
members, the elongation (in mm) of the link AB is __________ (Important : you should answer only the numeric value)

Solution:
*Answer can only contain numeric values
QUESTION: 84

Figure shows an elastic beam of constant flexural rigidity EI and length L.The transverse deflection v(x) for the beam is represented by the equation where M0 is the applied couple. If L= 100mm  and M0=  100N-mm  , then the magnitude of the shear force (in N) at the middle of the beam (at  x = L/ 2)  is _______________ (Important : you should answer only the numeric value)

Solution:
QUESTION: 85

Which one of the following represents the correct bending moment diagram of the beam PQR
loaded as shown in the figure? Solution:
QUESTION: 86

A point in a body is subjected to plane state of stress in XY plane. If σ= 140MPa, σ= 60MPa    and the major principal stress is 150 MPa, the magnitude of the in-plane shear stress (in MPa) is

Solution:
*Answer can only contain numeric values
QUESTION: 87

A 40 mm diameter rotor shaft of a helicopter transmits a torque T = 0.16 π kN-m and a tensile force
P = 24 π kN. The maximum tensile stress (in MPa) induced in the shaft is __________. Use the
value of π = 3.1416. (Important : you should answer only the numeric value)

Solution:
*Answer can only contain numeric values
QUESTION: 88

wooden block of length 400 mm, width 50 mm and depth 100 mm is subjected to uniaxial load as shown in the figure. An inclined plane ABCD is shown which makes an angle θ with the XZ
plane and the line CD is parallel to the Z-axis. The normal stress on the plane ABCD is σn1  when θ =30o and the normal stress on the plane ABCD is σn2 when θ =120o . The value of σn2n1 is _______________ (Important : you should answer only the numeric value)

Solution:
QUESTION: 89

For the truss shown in the figure, which one of the following statements is true? Solution:
QUESTION: 90

Notation used:
P - pressure, V - volume, T - temperature, S - entropy, H - enthalpy, U - internal energy, A - Helmholtz free
energy, Cp - specific heat capacity at constant pressure.
Specific properties are designated by lower case symbols.

Useful data:
Universal gas constant R = 8.314 kJ/(kmol.K)
Cp of air = 1.005 kJ/(kg.K)
Ratio of ideal gas specific heats for air: γ = 1.4
Molecular mass of hydrogen: 2 kg/kmol

Q. 90 – Q. 98 carry one mark each.

Q.

Which of the following thermodynamic properties is NOT an intensive property of a
thermodynamic system:

Solution:
QUESTION: 91

An U-tube manometer shows a height difference of z1 between the two columns for a known gauge
pressure P1 (both z1 and P1 in appropriate units). If the height difference between the two columns
is 2z1, then the corresponding gauge pressure will be:

Solution:
QUESTION: 92

Water vapour can be treated as an ideal gas,

Solution:
QUESTION: 93

The thermal efficiency of a Carnot engine is 0.5. If the temperature of the cold reservoir is 300 K,
then the temperature of the hot reservoir is:

Solution:
QUESTION: 94

In a reversible, constant-pressure, non-flow process, heat input is given by

Solution:
QUESTION: 95

Moist air undergoes an adiabatic saturation process such that the relative humidity of air increases.
For this process,

Solution:
QUESTION: 96

T1: temperature before throttling
T2: temperature after throttling
Assuming no change in kinetic and potential energy due to throttling, which of the following is
correct:

Solution:
QUESTION: 97

For irreversible heat transfer from a hot body to a cold body, if Δ denotes the property change of
both hot and cold bodies (i.e. difference between its final and initial values), then

Solution:
QUESTION: 98

A closed system undergoes a cyclic process. For the net work done by the system on the
surroundings, which of the following statements is FALSE:

Solution:
QUESTION: 99

Q. 99 – Q. 111 carry two marks each.

Q.

Consider the following statements related to the second law of thermodynamics:
P. A cyclic heat engine cannot produce net work by exchanging heat only with one reservoir.
Q. The efficiency of a reversible heat engine is dependent on the nature and amount of working
substance undergoing the cycle.
R. It is impossible to have a cyclic device which will produce no effect other than the transfer of
heat from a cold body to a hot body.
S. It is impossible to have heat engines operating between a heat source and sink to have a lower
efficiency than that of a reversible heat engine operating between the same source and sink.
For which of the following options, BOTH the statements are inconsistent with the second law of
thermodynamics:

Solution:
QUESTION: 100

Consider the following statements related to air-standard Otto, Diesel, and Brayton cycles:
P. Brayton cycle has at least one isentropic and one isobaric process.
Q. Otto cycle has at least one isentropic and one isochoric process.
R. Diesel cycle has at least one isentropic and one isothermal process.
S. At least one of the cycles has an isothermal process.
For which of the following options, BOTH the statements are consistent with the operation of the
above cycles:

Solution:
*Answer can only contain numeric values
QUESTION: 101

Volumetric analysis of a hydrocarbon combustion product shows 8% CO2, 15% H2O (vapour),
5.5% O2 and 71.5% N2. The combustion product flows steadily through a heat exchanger at 200
kPa pressure. Assume each component in the mixture to be an ideal gas. In order to avoid the
condensation of H2O in the heat exchanger, the minimum allowable temperature (in oC) is ______. Solution:
*Answer can only contain numeric values
QUESTION: 102

An equimolar mixture of two ideal gases (A, B) expands isentropically in a nozzle. The gas mixture
enters the nozzle at 300 kPa, 400 K and exits at 100 kPa. Assuming the mixture to be an ideal gas,
the exit temperature of the gas mixture (in K) is _________. Solution:
*Answer can only contain numeric values
QUESTION: 103

A rigid vessel of volume 10 m3 is filled with hydrogen at 25oC and 500 kPa. Due to leakage, some
gas has escaped from the vessel until the pressure in the vessel drops down to 200 kPa, and the
corresponding temperature of the gas inside the vessel is found to be 15oC. The amount of gas
leaked (in kg) from the vessel is _________.

Solution:
*Answer can only contain numeric values
QUESTION: 104

A hot ideal gas (Cp = 1.2 kJ/(kg.K)) steadily flows through a turbine with inlet and exit
temperatures of 1500 K and 500 K respectively. The minimum mass flow rate (in kg/s) of the hot
gas to achieve a power output of 12 MW is ____________.

Solution:
*Answer can only contain numeric values
QUESTION: 105

Air pressure inside a spherical balloon is proportional to its diameter. The balloon undergoes a
reversible, isothermal, non-flow process. During the process, the balloon maintains its spherical
shape, and the air inside the balloon consumes 2 kJ of heat. Initial air pressure inside the balloon
was 120 kPa, while the initial balloon diameter was 20 cm. Assuming air to be an ideal gas, the
final diameter of the balloon (in cm) is _____________.

Solution:
*Answer can only contain numeric values
QUESTION: 106

An air-standard diesel engine has a compression ratio of 18 (the ratio of the volume at the
beginning of the compression process to that at the end of the compression process), and a cut-off
ratio of 2 (the ratio of the volume at the end of the heat addition process to that at the beginning of
the heat addition process). The thermal efficiency (in %) of the engine is ____________________.

Solution:
*Answer can only contain numeric values
QUESTION: 107

Compressed air, at 1 MPa pressure, 400 K temperature flows through a large pipe. An evacuated,
insulated rigid tank of 0.5 m3 volume is connected to the pipe through a valve. The valve is opened
to fill the tank and the valve closes automatically when the tank pressure reaches 1 MPa. Assuming
ideal gas behaviour, the final air temperature in the tank (in K) is __________.

Solution:
*Answer can only contain numeric values
QUESTION: 108

A 40 kg metal block (Cp = 0.5 kJ/(kg.K)) at T = 450oC is quenched in 150 kg oil (Cp = 2.5 kJ/(kg. K)) at T = 25oC. If the combined (metal block and oil) system is fully isolated from its surroundings, then the net change in the entropy (in kJ/K) of the combined system is _______________

Solution:
QUESTION: 109

For phase change from solid (sol) to liquid (liq) state, if the slope of the solid-liquid coexistence
line in the P-T diagram is negative, then:

Solution:
*Answer can only contain numeric values
QUESTION: 110

A house-hold refrigerator operates under steady state condition between an evaporator temperature of 263 K and a condenser temperature of 323 K. The heat load to the refrigerator is 3 kW. The actual COP of the refrigerator is half of that of a Carnot refrigerator operating between the same condenser and evaporator temperatures. The power required (in kW) to run the refrigerator is ___________.

Solution:
QUESTION: 111

The Maxwell relation that results from the expression for the Helmholtz free energy A=U-TS, is:

Solution:
QUESTION: 112

Q. 112 – Q. 120 carry one mark each.

Q.

The polymer with minimum number of branches is

Solution:
QUESTION: 113

Nitrile rubber is a copolymer of

Solution:
QUESTION: 114

The functionality of 1,4-divinylbenzene in reactions involving addition across carbon-carbon
double bond is

Solution:
QUESTION: 115

The comonomer common to Nylon 66 and Nylon 46 is

Solution:
QUESTION: 116

Polyethylene and polypropylene form an immiscible blend mainly due to

Solution:
QUESTION: 117

Rubber modulus is

Solution:
QUESTION: 118

The solubility parameter is determined by using

Solution:
QUESTION: 119

'Roller die' consists of a combination of

Solution:
QUESTION: 120

Resole is an example of

Solution:
QUESTION: 121

Q. 121 – Q. 133 carry two marks each.

Q.

Match the processing technique to the appropriate product listed below: Solution:
*Answer can only contain numeric values
QUESTION: 122

For a high molecular weight polymer sample with a viscosity of 6 x 1011 Poise and a stress
relaxation modulus of 3 x 106 dyne cm-2 at a given temperature, the relaxation time will be _____
hours.

Solution:
QUESTION: 123

Match the following polymer additives to their function: Solution:
*Answer can only contain numeric values
QUESTION: 124

Tensile force of 165 N is applied to a piece of vulcanized rubber of dimension 4 mm x 4 mm x 30
mm. If the sample is elongated by 50% of its original length under the same applied force, the true
stress will be _______ MPa.

Solution:
QUESTION: 125

The order of glass transition temperature for the given polymers is
[NR=natural rubber; PP=polypropylene; PE=polyethylene; PMMA=poly(methyl methacrylate)]

Solution:
QUESTION: 126

Dynamic mechanical analysis of polystyrene (Tg = 100 ºC) measured at a frequency of 1 Hz shows
the damping peak at 110 ºC. If the measurement is made at 104 Hz, then the peak temperature (ºC)
will be

Solution:
QUESTION: 127

Match the product to the most suitable plastic listed below: Solution:
*Answer can only contain numeric values
QUESTION: 128

The number average molecular weight for the polymerization of adipic acid and ethylene glycol
(feed ratio 1:1) at 99 percent conversion is ________ g mol-1.

Solution:
*Answer can only contain numeric values
QUESTION: 129

A composite material contains 30 % by volume of uniaxially aligned glass fibres in a matrix of
alkyd resin. The tensile moduli of the glass fibre and alkyd resin are 76 GPa and 3 GPa,
respectively. If a tensile stress of 100 MPa is applied parallel to the fibres, the percentage
longitudinal strain is _____

Solution:
QUESTION: 130

Match the elastomers listed below to the appropriate curing agent: Solution:
*Answer can only contain numeric values
QUESTION: 131

The weight of graphite fiber (density = 1800 kg m-3) that should be added to 1.00 kg of vinyl ester
resin (density = 1250 kg m-3) to produce a composite with a density of 1600 kg m-3 is _______ kg.

Solution:
*Answer can only contain numeric values
QUESTION: 132

If the values of K and a in the Mark-Houwink equation are 1.5 x 10-4 dL g-1 and 0.60, respectively,
the viscosity average molecular weight of a polymer having an intrinsic viscosity of 0.05 dL g-1 is
_____ kg mol-1.

Solution:
*Answer can only contain numeric values
QUESTION: 133

A rectangular polymer bar of length 40 mm fits exactly into a steel mold cavity and the entire assembly was heated from 20 to 100 ºC. The linear thermal expansion coefficients of the polymer and steel are

80 x 10-6 ºC-1 and 11 x 10-6 ºC-1, respectively. The strain encountered by the polymer sample along the length will be _____ %.

Solution:
QUESTION: 134

Q. 134 – Q. 142 carry one mark each.

Q.

Bread staling is caused by _________.

Solution:
QUESTION: 135

Arrange the grades of tea in the increasing order of their leaf size _____, _______ and ______.

Solution:
*Answer can only contain numeric values
QUESTION: 136

Fruit juice is being pasteurized in a tubular heat exchanger. The retention time in holding tube of
0.2 m² cross sectional area is 3 seconds. If the flow rate of juice is 0.4 m3 s-1, the length of the
holding tube in m, is _____.

Solution:
QUESTION: 137

The oil, which experiences flavor reversion even at the lower peroxide value is _______.

Solution:
*Answer can only contain numeric values
QUESTION: 138

80 kg of wheat containing 10 kg of moisture has been dried to a moisture content of 8% wet basis in 3 hours under constant rate period of drying. The drying rate in kg h-1 is _____

Solution:
QUESTION: 139

The rate of cream separation in a disc bowl centrifuge can be increased by ______

Solution:
QUESTION: 140

Which one of the following is not used in mass transfer analysis?

Solution:
QUESTION: 141

Oxygen is permeating through an EVOH film of thickness ‘t’ and solubility coefficient ‘S’. If
diffusivity of oxygen through the film is ‘D’, then permeability of oxygen through the film will be ______.

Solution:
QUESTION: 142

Condensing steam is used to heat vegetable oil in a double pipe co-current heat exchanger. If the
inlet and outlet temperature of steam are Thi and Tho, and for vegetable oil Tci and Tco, respectively, the log mean temperature difference (ΔTLM ) will be _______

Solution:
QUESTION: 143

Q. 143 – Q. 155 carry two marks each.

Q.

Match the food spoilage organisms given in Column I with the associated foods given in Column II Solution:
QUESTION: 144

Fluid is flowing inside a pipe of radius ‘R’ in fully developed laminar flow. If the velocity of the
fluid at the centre at a distance ‘L’ is ‘vmax’, velocity at radial distance of ¾ (R) will be __times vmax

Solution:
*Answer can only contain numeric values
QUESTION: 145

A meat ball with a radius of 25.4 mm at a temperature of 700 K, is suddenly plunged into a medium whose temperature is held at 395 K. Assume a convective heat transfer coefficient of 11.5 W m-2 K-1 and take the average physical properties as: K = 44 W m-1 K-1, ρ = 7850 kg m-3 and
cp = 0.4606 kJ kg-1K-1. The temperature (K) of the meat ball after one hour is _____

Solution:
QUESTION: 146

a) Assertion: Acidulates are added in soft drinks to provide a buffering action. r) Reason: Buffers tend to prevent changes in pH and prevent excessive tartness. Choose the correct answer from the following

Solution:
*Answer can only contain numeric values
QUESTION: 147

The D121 and Z values for C. botulinum spores in canned food are 0.2 min and 10 oC respectively. Total time required in min, to reduce the spores from 102 to 10-6 at 111 oC is _______

Solution:
QUESTION: 148

a) Assertion: Olestra is used as a zero calorie fat replacer r) Reason: It is a sucrose polyester with 6-8 acyl group and is not absorbed in the human
digestive system. Choose the correct answer from the following

Solution:
QUESTION: 149

Match the enzymes in Column I with their functions in Column II Solution:
QUESTION: 150

Match the terms in Column I with their most appropriate description in Column II Solution:
QUESTION: 151

Match the products in Column I with their Original Phase in Column II Solution:
QUESTION: 152

a) Assertion: Presence of low sulphur containing amino acids make casein in milk to boil, sterilize
and concentrate without coagulation even at higher temperature. r) Reason: This is due to the restricted formation of di-sulphide bonds resulting in increased stability. Choose the correct answer from the following

Solution:
QUESTION: 153

In a typical Psychrometric Chart shown below, the processes OP, OQ and OR related to air water vapor mixture are _____, _______ and __________. Solution:
*Answer can only contain numeric values
QUESTION: 154

A fruit juice with a negligible boiling point rise is being evaporated using saturated steam at 121.1 °C in a triple effect evaporator having equal area in each effect. The pressure of the vapor in the last effect is 25.6 kPa absolute and the corresponding saturation temperature is 65.7 °C. The
heat transfer coefficients are U1 = 2760, U2 =1875 and U3 = 1350 W m-2 K-1. The boiling point (°C) in the first effect is __ .

Solution:
*Answer can only contain numeric values
QUESTION: 155

In an aeration system, 520 kg of wheat grains having average size of 0.15 mm, shape factor of 0.88
and density of 1040 kg m-3 are fluidized using air at 2 atm absolute and 25 °C. If the cross section
of empty bed is 0.4 m2, the minimum height (m) of the fluidized bed, with voidage of 0.45 will be
_____ .

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