Chemical Engineering Gate Yearwise 


Chemical Engineering Gate 2016 Questions with Answer

Ques 40 GATE 2016

Steam at 100oC is condensing on a vertical steel plate. The condensate flow is laminar. The average Nusselt numbers are Nu1 and Nu2, when the plate temperatures are 10oC and 55oC, respectively. Assume the physical properties of the fluid and steel to remain constant within the temperature range of interest. Using Nusselt equations for film-type condensation, what is the value of the ratio Nu2/Nu1?

A

(A) 0.5

B

(B) 0.84

C

(C) 1.19

D

(D) 1.41


(c) is the correct answer.

Ques 41 GATE 2016

In an experimental setup, mineral oil is filled in between the narrow gap of two horizontal smooth plates. The setup has arrangements to maintain the plates at desired uniform temperatures. At these temperatures, ONLY the radiative heat flux is negligible. The thermal conductivity of the oil does not vary perceptibly in this temperature range. Consider four experiments at steady state under different experimental conditions, as shown in the figure below. The figure shows plate temperatures and the heat fluxes in the vertical direction. What is the steady state heat flux (in W m^{-2}) with the top plate at 70oC and the bottom plate at 40oC?

A

(A) 26

B

(B) 39

C

(C) 42

D

(D) 63


(a) is the correct answer.

Ques 42 GATE 2016

The space between two hollow concentric spheres of radii 0.1 m and 0.2 m is under vacuum. Exchange of radiation (uniform in all directions) occurs only between the outer surface (S1) of the smaller sphere and the inner surface (S2) of the larger sphere. The fraction (rounded off to the second decimal place) of the radiation energy leaving S2, which reaches S1 is _______


(0.25) is the correct answer.

Ques 43 GATE 2016

A binary liquid mixture of benzene and toluene contains 20 mol% of benzene. At 350 K the vapour pressures of pure benzene and pure toluene are 92 kPa and 35 kPa, respectively. The mixture follows Raoult’s law. The equilibrium vapour phase mole fraction (rounded off to the second decimal place) of benzene in contact with this liquid mixture at 350 K is _______


(0.40) is the correct answer.

Ques 44 GATE 2016

For what value of Lewis number, the wet-bulb temperature and adiabatic saturation temperature are nearly equal?

A

(A) 0.33

B

(B) 0.5

C

(C) 1

D

(D) 2


(c) is the correct answer.

Ques 45 GATE 2016

A binary distillation column is to be designed using McCabe Thiele method. The distillate contains 90 mol% of the more volatile component. The point of intersection of the q-line with the equilibrium curve is (0.5, 0.7). The minimum reflux ratio (rounded off to the first decimal place) for this operation is _______


(1.0) is the correct answer.

Ques 46 GATE 2016

Solute C is extracted in a batch process from a binary mixture (F) of A and C using solvent B. Pure solvent B is recovered from the raffinate R by distillation, as shown in the schematic diagram below. Locations of different mixtures for this process are indicated on the triangular diagram below. P is the solvent-free raffinate, E is the extract, F is the feed and Δ is the difference point from which the mass balance lines originate. The line PB intersects the binodal curve at U and T. The lines PA and FB intersect the binodal at V and W respectively.

The raffinate coming out of the extractor is represented in the diagram by the point:

A

(A) T

B

(B) U

C

(C) V

D

(D) W


(b) is the correct answer.

Ques 47 GATE 2016

At 30oC, the amounts of acetone adsorbed at partial pressures of 10 and 100 mmHg are 0.1 and 0.4 kg acetone/kg activated carbon, respectively. What is the amount of acetone adsorbed (in kg per kg of activated carbon) at a partial pressure of 50 mmHg and 30oC according to Freundlich isotherm?

A

(A) 0.23

B

(B) 0.25

C

(C) 0.30

D

(D) 0.35


(c) is the correct answer.

Ques 48 GATE 2016

In a cyclone separator used for separation of solid particles from a dust laden gas, the separation factor is defined as the ratio of the centrifugal force to the gravitational force acting on the particle. Sr denotes the separation factor at a location (near the wall) that is at a radial distance r from the centre of the cyclone. Which one of the following statements is INCORRECT?

A

(A) Sr depends on mass of the particle

B

(B) Sr depends on the acceleration due to gravity

C

(C) Sr depends on tangential velocity of the particle

D

(D) Sr depends on the radial location (r) of the particle


(a) is the correct answer.

Ques 49 GATE 2016

A liquid mixture of ethanol and water is flowing as inlet stream P into a stream splitter. It is split into two streams, Q and R, as shown in the figure below.

The flowrate of P, containing 30 mass% of ethanol, is 100 kg/h. What is the least number of additional specification(s) required to determine the mass flowrates and compositions (mass%) of the two exit streams?

A

(A) 0

B

(B) 1

C

(C) 2

D

(D) 3


(b) is the correct answer.

Ques 50 GATE 2016

Match the instruments in Group-1 with process variables in

Group-1 Group-2
P) Conductivity meter I) Flow
Q) Turbine meter II) Pressure
R) Piezoresistivity element III) Composition

A

(A) P-II, Q-I, R-III

B

(B) P-II, Q-III, R-I

C

(C) P-III, Q-I, R-II

D

(D) P-III, Q-I, R-II


(d) is the correct answer.

Ques 51 GATE 2016

What is the order of response exhibited by a U-tube manometer?

A

(A) Zero order

B

(B) First order

C

(C) Second order

D

(D) Third order


(c) is the correct answer.

Ques 52 GATE 2016

A system exhibits inverse response for a unit step change in the input. Which one of the following statement must necessarily be satisfied?

A

(A) The transfer function of the system has at least one negative pole

B

(B) The transfer function of the system has at least one positive pole

C

(C) The transfer function of the system has at least one negative zero

D

(D) The transfer function of the system has at least one positive zero


(d) is the correct answer.

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