GATE CH year:2019 PYQs & Answers — Page 4

Questions 31–40 of 65. Imported answers require independent review unless marked reviewed.

The combination that correctly matches the polymer in Group-1 with the polymerization reaction type in Group-2 is

Group-1: P) Nylon 6; Q) Polypropylene; R) Polyester

Group-2: I) Condensation polymerization; II) Ring opening polymerization; III) Addition polymerization

Your answerChoose one option.

P-II, Q-I, R-III

P-I, Q-III, R-II

P-III, Q-II, R-I

P-II, Q-III, R-I

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The product of the eigenvalues of the matrix

is ______ (rounded off to one decimal place).

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For a hydraulic lift with dimensions shown in figure, assuming

, the maximum diameter

(in m) that lifts a vehicle of mass 1000 kg using a force of 100 N is ______ (rounded off to two decimal places).

Diagram for Chemical Engineering question 23

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The liquid flow rate through an equal percentage control valve, when fully open, is 150 gal/min and the corresponding pressure drop is 50 psi. If the specific gravity of the liquid is 0.8, then the valve coefficient,

(in gal/(min psi

)) is ______ (rounded off to two decimal places).

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Consider a sealed rigid bottle containing CO

and H

O at 10 bar and ambient temperature. Assume that the gas phase in the bottle is pure CO

and follows the ideal gas law. The liquid phase in the bottle contains CO

dissolved in H

O and is an ideal solution. The Henry’s constant at the system pressure and temperature is

bar. The equilibrium mole fraction of CO

dissolved in H

O is ______ (rounded off to three decimal places).

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The solution of the ordinary differential equation

, subject to the initial condition

, is

Your answerChoose one option.

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The value of the complex number

(where

) is

Your answerChoose one option.

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An incompressible Newtonian fluid flows in a pipe of diameter

at volumetric flow rate

. Fluid with same properties flows in another pipe of diameter

at the same flow rate

. The transition length required for achieving fully-developed flow is

for the tube of diameter

, while it is

for the tube of diameter

. Assuming steady laminar flow in both cases, the ratio

is:

Your answerChoose one option.

1/4

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A disk turbine is used to stir a liquid in a baffled tank. To design the agitator, experiments are performed in a lab-scale model with a turbine diameter of 0.05 m and a turbine impeller speed of 600 rpm. The liquid viscosity is 0.01 Pa s while the liquid density is 1000 kg/m

. The actual application has a turbine diameter of 0.5 m, an impeller speed of 600 rpm, a liquid viscosity of 0.1 Pa s and a liquid density of 1000 kg/m

. The effect of gravity is negligible. If the power required in the lab-scale model is

and the estimated power for the actual application is

, then the ratio

Your answerChoose one option.

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Consider two non-interacting tanks-in-series as shown in figure. Water enters TANK 1 at

/s and drains down to TANK 2 by gravity at a rate

(cm

/s). Similarly, water drains from TANK 2 by gravity at a rate

(cm

/s) where

and

represent levels of TANK 1 and TANK 2, respectively (see figure). Drain valve constant

/s and cross-sectional areas of the two tanks are

. At steady state operation, the water inlet flow rate is

/s. The transfer function relating the deviation variables

(cm) to flow rate

(cm

/s) is,

Diagram for Chemical Engineering question 30

Your answerChoose one option.

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GATE CH year:2019 PYQs

Question 21

Question 22

Question 23

Question 24

Question 25

Question 26

Question 27

Question 28

Question 29

Question 30