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Chemical Engineering- CH 2012 GATE Paper (Practice Test)


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Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 1

Q. 1 – Q. 5 carry one mark each.
Q. Which one of the following options is the closest in meaning to the word given below?
Mitigate

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 2

C hoose the most appropriate alternative from the options given below to complete the following
sentence:
Despite several ––––––––– the mission succeeded in its attempt to resolve the conflict.

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 3

The cost function for a product in a firm is given by 5q2, where q is the amount of production. The firm can sell the product at a market price of   50 per unit. The number of units to be produced by the firm such that the profit is maximized is

 

Detailed Solution for Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 3

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 4

C hoose the most appropriate alternative from the options given below to complete the following
sentence:
Suresh’s dog is the one ––––––––– was hurt in the stampede

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 5

C hoose the grammatically INCORRECT sentence:

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 6

Q. 6 - Q. 10 carry two marks each.

Q.

A n automobile plant contracted to buy shock absorbers from two suppliers X and Y. X supplies
60% and Y supplies 40% of the shock absorbers. All shock absorbers are subjected to a quality test.
The ones that pass the quality test are considered reliable. Of X’s shock absorbers, 96% are reliable.
Of Y’s shock absorbers, 72% are reliable.
The probability that a randomly chosen shock absorber, which is found to be reliable, is made by
Y is

Detailed Solution for Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 6

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 7

A political party orders an arch for the entrance to the ground in which the annual convention is
being held. The profile of the arch follows the equation y = 2x – 0.1x2 where y is the height of the
arch in meters. The maximum possible height of the arch is

Detailed Solution for Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 7

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 8

W anted Temporary, Part-time persons for the post of Field Interviewer to conduct personal
interviews to collect and collate economic data. Requirements: High School-pass, must be
available for Day, Evening and Saturday work. Transportation paid, expenses reimbursed.

Which one of the following is the best inference from the above advertisement?

Detailed Solution for Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 8

Gender is not mentioned  in the advertisement and B clearly eliminated

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 9

G iven the sequence of terms, AD CG FK JP, the next term is

Detailed Solution for Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 9

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 10

W hich of the following assertions are CORRECT?

P: Adding 7 to each entry in a list adds 7 to the mean of the list
Q: Adding 7 to each entry in a list adds 7 to the standard deviation of the list
R: Doubling each entry in a list doubles the mean of the list
S: Doubling each entry in a list leaves the standard deviation of the list unchanged

Detailed Solution for Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 10

P and R a;ways hold true

Else consider a sample ser {1,2,3,4} and  check accordingly

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 11

Q. 11 – Q. 35 carry one mark each.

Q.

Consider the following set of linear algebraic equations

The system has

Detailed Solution for Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 11

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 12

If a and b are arbitrary constants, then the solution to the ordinary differential equation

is

Detailed Solution for Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 12

Consider Option (D), y= a cosh 2x+b sinh 2x;

 dy/dx= 2sinh 2x + 2b cosh 2x;

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 13

F or the function the Taylor series approximation for  is.

Detailed Solution for Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 13

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 14

A box containing 10 identical compartments has 6 red balls and 2 blue balls. If each compartment
can hold only one ball, then the number of different possible arrangements are

Detailed Solution for Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 14

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 15

C onsider the following (2 x 2) matrix

Which one of the following vectors is NOT a valid eigenvector of the above matrix ?

Detailed Solution for Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 15

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 16

In a throttling process, the pressure of an ideal gas reduces by 50 %. If CP and CV are the heat
capacities at constant pressure and constant volume, respectively  the specific
volume will change by a factor of

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 17

I f the temperature of saturated water is increased infinitesimally at constant entropy, the resulting
state of water will be

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 18

In a parallel flow heat exchanger operating under steady state, hot liquid enters at a temperature
Th,in and leaves at a temperature Th,out . Cold liquid enters at a temperature Tc,in and leaves at a
temperature Tc,out . Neglect any heat loss from the heat exchanger to the surrounding. If
Th,in >> Tc,in , then for a given time interval, which ONE of the following statements is true?

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 19

F or an exothermic reversible reaction, which one of the following correctly describes the
dependence of the equilibrium constant ( K ) with temperature (T ) and pressure ( P ) ?

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 20

W ater is flowing under laminar conditions in a pipe of length L . If the diameter of the pipe is
doubled, for a constant volumetric flow rate, the pressure drop across the pipe

Detailed Solution for Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 20

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 21

The local velocity of a fluid along a streamline can be measured by

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 22

F or uniform laminar flow (in the x -direction) past a flat plate at high Reynolds number, the local
boundary layer thickness (δ ) varies with the distance along the plate ( x ) as

Detailed Solution for Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 22

For a flow over a flat plate, the local boundary thichness (δ) varies with x0.5  for laminar flow.

x0.8 for fully developed turbulent flow

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 23

I n a mixing tank operating at very high Reynolds number (> 104 ), if the diameter of the impeller is
doubled (other conditions remaining constant), the power required increases by a factor of

Detailed Solution for Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 23

For mixing tank

power required

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 24

F or heat transfer across a solid-fluid interface, which one of the following statements is NOT true
when the Biot number is very small compared to 1?

Detailed Solution for Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 24

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 25

A solid sphere with an initial temperature Ti is immersed in a large thermal reservoir of
temperature To . The sphere reaches a steady temperature after a certain time t1 . If the radius of the
sphere is doubled, the time required to reach steady-state will be

Detailed Solution for Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 25

 

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 26

I f the Nusselt number ( Nu ) for heat transfer in a pipe varies with Reynolds number (Re ) as 

 

then for constant average velocity in the pipe, the heat transfer coefficient varies with
the pipe diameter D as

Detailed Solution for Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 26

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 27

I n the McCabe-Thiele diagram, if the x -coordinate of the point of intersection of the q -line and
the vapor-liquid equilibrium curve is greater than the x -coordinate of the feed point, then the
quality of the feed is

Detailed Solution for Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 27

 The present case falls under the case of (1)

 

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 28

F or which of the following combinations, does the absorption operation become gas-film
controlled?
P. The solubility of gas in the liquid is very high
Q. The solubility of gas in the liquid is very low
R. The liquid-side mass transfer coefficient is much higher than the gas-side mass transfer
coefficient
S. The liquid-side mass transfer coefficient is much lower than the gas-side mass transfer
coefficient

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 29

The half-life of an nth order reaction in a batch reactor depends on

Detailed Solution for Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 29

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 30

C onsider the reaction scheme shown below

Both the reactions are first-order. The activation energies for k1 and k are 80 and 20 kJ/mol,
respectively. To maximize the yield of B, it is preferable to use

Detailed Solution for Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 30

  High Temprature and high concentration of CA is needed for maximum yield of B

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 31

I n petroleum refining, catalytic reforming is used to convert

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 32

T he final boiling points of gasoline, diesel, atmospheric gas oil (AGO) and lubricating oils vary as

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 33

T he main unit processes used for the production of hydrogen from natural gas are steam reforming
(SR), pressure swing adsorption (PSA), low temperature water gas shift reaction (LT WGS) and
high temperature water gas shift reaction (HT WGS). The correct sequence of these in the plant is

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 34

A thermometer initially at 100°C is dipped at t = 0 into an oil bath, maintained at 150°C. If the
recorded temperature is 130°C after 1 minute, then the time constant of thermometer (in min) is

Detailed Solution for Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 34

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 35

T he Bode stability criterion is applicable when

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 36

Q. 36 to Q. 65 carry two marks each.

Q.

The one - dimensional unsteady state heat conduction equation in a hollow cylinder with a constant
heat source q is

If A and B are arbitrary constants, then the steady state solution to the above equation is

Detailed Solution for Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 36

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 37

If a is a constant, then the value of the integral  is

Detailed Solution for Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 37

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 38

The Newton – Raphson method is used to find the roots of the equation

f(x)= x- cosπx                               0x1

If the initial guess for the root is 0.5, then the value of x after the first iteration is

Detailed Solution for Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 38

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 39

If i =  , the value of the integral 

using the Cauchy residue theorem is

Detailed Solution for Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 39

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 40

A n insulated, evacuated container is connected to a supply line of an ideal gas at pressure Ps , temperature Ts and specific volume vs . The container is filled with the gas until the pressure in the container reaches Ps . There is no heat transfer between the supply line to the container, and kinetic and potential energies are negligible. If CP and CV are the heat capacities at constant pressure and constant volume, respectively   then the final temperature of the gas in the container is

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 41

Consider a binary liquid mixture at constant temperature T and pressure P . If the enthalpy change
of mixing,  ΔH = 5x1x2 , where x1 and x2 are the mole fraction of species 1 and 2 respectively, and
the entropy change of mixing ΔS =-R[x1 in x1+x2 in x2](with R = 8.314 J/mol.K), then the minimum value of the Gibbs free energy change of mixing at 300 K occurs when

Detailed Solution for Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 41

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 42

A bed of spherical glass beads (density 3000 kg/m3, diameter 1 mm, bed porosity 0.5) is to be
fluidized by a liquid of density 1000 kg/m3 and viscosity 0.1 Pa.s. Assume that the Reynolds
number based on particle diameter is very small compared to one. If g = 10 m/s2, then the
minimum velocity (in m/s) required to fluidize the bed is

Detailed Solution for Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 42

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 43

F or the enclosure formed between two concentric spheres as shown below ( R2 = 2R1 ), the fraction
of radiation leaving the surface area A2 that strikes itself is

 

Detailed Solution for Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 43

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 44

H eat is generated at a steady rate of 100 W due to resistance heating in a long wire (length = 5 m, diameter = 2 mm). This wire is wrapped with an insulation of thickness 1 mm that has a thermal conductivity of 0.1 W/m.K. The insulated wire is exposed to air at 30°C. The convective heat transfer between the wire and surrounding air is characterized by a heat transfer coefficient of 10 W/m2.K. The temperature (in °C) at the interface between the wire and the insulation is

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 45

I n a counter-flow double pipe heat exchanger, oil (m = 2 kg/s, P C = 2.1 kJ/kg.°C) is cooled from
90 °C to 40 °C by water ( m = 1 kg/s, P C = 4.2 kJ/kg.°C) which enters the inner tube at 10 °C. The
radius of the inner tube is 3 cm and its length is 5 m. Neglecting the wall resistance, the overall heat
transfer coefficient based on the inner radius, in kW/ m2.K, is

Detailed Solution for Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 45

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 46

T he rate-controlling step for the solid-catalyzed irreversible reaction

A+B → C

is known to be the reaction of adsorbed A with adsorbed B to give adsorbed C . If i P is the partial
pressure of component i and Ki is the adsorption equilibrium constant of component i , then the
form of the Langmuir-Hinshelwood rate expression will be

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 47

C onsider the drying operation shown in the figure below for a solid loading (dry basis) of 50 kg/m2
with a constant drying rate of 5 kg/m2.h. The falling rate of drying is linear with moisture content.

The drying time (in hrs) required to reduce an initial moisture content of 25% to a final moisture
content of 2% is

Detailed Solution for Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 47

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 48

A n equimolar mixture of A and B (A being more volatile) is flash distilled continuously at a feed
rate of 100 kmol/h, such that the liquid product contains 40 mol % of A. If the relative volatility
is 6, then the vapor product, in kmol/h, is

Detailed Solution for Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 48

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 49

A thermocouple having a linear relationship between 0oC and 350 oC shows an emf of zero and
30.5 mV, respectively at these two temperatures. If the cold junction temperature is shifted from
0 oC to 30 oC, then the emf correction (in mV) is

Detailed Solution for Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 49

since, the releationship is linear

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 50

The characteristic equation for a system is

s3+9s2 +26s +12(2+kc) =0

Using the Routh test, the value of Kc that will keep the system on the verge of instability is

Detailed Solution for Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 50

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 51

The elementary reversible exothermic gas-phase reaction

a+3B ⇔ 2C

is to be conducted in a non-isothermal, non-adiabatic plug flow reactor. The maximum allowable
reactor temperature is Tmax . To minimize the total reactor volume, the variation of reactor
temperature (T ) with axial distance from the inlet ( z ) should be

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 52

The block diagram of a system with a proportional controller is shown below

A unit step input is introduced in the set point. The value of Kc to provide a critically damped
response for  

Detailed Solution for Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 52

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 53

A batch reactor produces 1x105 kg of a product per year. The total batch time (in hours) of the reactor is , where PB is the product per batch in kg and  . The operating cost
of the reactor is Rs. 200/h. The total annual fixed charges are Rs. 340 × PB and the annual raw
material cost is Rs. 2 x106 . The optimum size (in kg) of each batch (adjusted to the nearest
integer) is

Detailed Solution for Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 53

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 54

Heat integration is planned in a process plant at an investment Rs. 2x106 . This would result in a
net energy savings of 20 GJ per year. If the nominal rate of interest is 15% and the plant life is
3 years, then the breakeven cost of energy, in Rs. per GJ (adjusted to the nearest hundred), is

Detailed Solution for Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 54

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 55

In a 1-1 pass floating head type shell and tube heat exchanger, the tubes (od = 25 mm; id = 21 mm)
are arranged in a square pitch. The tube pitch is 32 mm. The thermal conductivity of the shell side
fluid is 0.19 W/m.K, and the Nusselt number is 200. The shell-side heat transfer coefficient
(in W/m2.K), rounded off to the nearest integer, is

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 56

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

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 57

M atch the polymer in Group I to the polymer characteristic in Group II

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 58

Common Data for Questions 58 and 59:

A counter-current extraction column is designed to remove 99% of solute C from a solution of solvent A and solute C using pure solvent B. The initial concentration of solute in the solution of A + C is 20 wt % and the total flow of solution is 1000 kg/h. If the equilibrium relationship is Y = 2X , where
Y = mass of C/mass of A and X = mass of C/mass of B.

Q.

The minimum flow rate of solvent B required (in kg/h) is

Detailed Solution for Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 58

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 59

A counter-current extraction column is designed to remove 99% of solute C from a solution of solvent A and solute C using pure solvent B. The initial concentration of solute in the solution of A + C is 20 wt % and the total flow of solution is 1000 kg/h. If the equilibrium relationship is Y = 2X , where
Y = mass of C/mass of A and X = mass of C/mass of B.

Q.

If the flow rate of B is 2400 kg/h, then the theoretical number of stages in the column, using
Kremser’s equation (adjusted to the next integer) is

 

Correct answer will be updated soon

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 60

Common Data for Questions

The reaction  is carried out in a reactor followed by a separator as shown
below

Notation:
Molar flow rate of fresh B is FB F
Molar flow rate of A is A F
Molar flow rate of recycle gas is RG F
Mole fraction of B in recycle gas is RB Y
Molar flow rate of purge gas is PG F
Molar flow rate of C is C F
Here, FFB = 2 mol/s; FA = 1 mol/s, F/ FA = 5 and A is completely converted.

Q.If YRB = 0.3, the ratio of recycle gas to purge gas (   FRG /FPG) is

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 61

The reaction  is carried out in a reactor followed by a separator as shown
below

Notation:
Molar flow rate of fresh B is FB F
Molar flow rate of A is A F
Molar flow rate of recycle gas is RG F
Mole fraction of B in recycle gas is RB Y
Molar flow rate of purge gas is PG F
Molar flow rate of C is C F
Here, FFB = 2 mol/s; FA = 1 mol/s, F/ FA = 5 and A is completely converted.

Q.

I f the ratio of recycle gas to purge gas (  FRG/ FPG ) is 4 then YRB is

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 62

A Newtonian fluid of viscosity μ flows between two parallel plates due to the motion of the bottom plate
(as shown below), which is moved with a velocity V . The top plate is stationary.

Q.

The steady, laminar velocity profile in the x -direction is

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 63

A Newtonian fluid of viscosity μ flows between two parallel plates due to the motion of the bottom plate
(as shown below), which is moved with a velocity V . The top plate is stationary.

Q.

T he force per unit area (in the x -direction) that must be exerted on the bottom plate to maintain the
flow is

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 64

The first order liquid phase reaction A→P is conducted isothermally in a plug flow reactor of 5 liter
volume. The inlet volumetric flow rate is 1 liter/min and the inlet concentration of A is 2 mole/liter.

Q.

If the exit concentration of A is 0.5 mole /liter, then the rate constant, in min−1, is

Detailed Solution for Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 64

Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 65

The first order liquid phase reaction A→P is conducted isothermally in a plug flow reactor of 5 liter
volume. The inlet volumetric flow rate is 1 liter/min and the inlet concentration of A is 2 mole/liter.

Q.

T he plug flow reactor is replaced by 3 mixed flow reactors in series, each of 2.0 liters volume. The
exact conversion of A (in %) is

Detailed Solution for Chemical Engineering- CH 2012 GATE Paper (Practice Test) - Question 65

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