GATE CH exam:gate PYQs & Answers — Page 5

Questions 41–50 of 650. Imported answers require independent review unless marked reviewed.

Consider the following curve in polar coordinates.

Which one of the following is the area enclosed by the curve for

Your answerChoose one option.

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Consider the following homogeneous isothermal liquid-phase parallel reactions carried out in three reactor configurations (having identical volumes and same operating temperatures), as shown in the figure.

where D is the desired product and U is the undesired product. The inlet concentrations of A and B are the same in all three configurations (

mol L

). The total molar feed flow rate of A (

) and that of B (

) are the same in all three configurations (

mol min

). In configuration I,

is equally distributed among all the inlets. Similarly, in configuration III,

is equally distributed among all the inlets. Assuming plug flow behavior at steady state, which one of the following statements is CORRECT?

Diagram for Chemical Engineering question 42

Your answerChoose one option.

Configuration I and Configuration III give the same selectivity of the desired product.

Configuration I gives the highest selectivity of the desired product.

Configuration II gives the highest selectivity of the desired product.

Configuration III gives the highest selectivity of the desired product.

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The reaction rate constants of two reactions follow Arrhenius’ law. The activation energies of Reaction 1 and Reaction 2 are

and

, respectively, and

. Assuming same value for the frequency factor for both the reactions, which one of the following statements is CORRECT?

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Reaction 1 and Reaction 2 are less temperature sensitive at lower temperature than at higher temperature.

Reaction 1 and Reaction 2 have the same temperature sensitivity at all temperatures.

Reaction 1 is more temperature sensitive than Reaction 2 at all temperatures.

Reaction 2 is more temperature sensitive than Reaction 1 at all temperatures.

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A control valve with hyperbolic characteristics has a turndown rate (ratio of maximum flow to minimum controllable flow) of 50. The flow rate through the valve at 70% open is 5 m

. Assuming constant fluid density and pressure drop across the valve, which one of the following is the flow rate (in m

) through the valve at 30% open?

Your answerChoose one option.

1.1

2.2

3.3

4.4

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The gross energy requirement, to reduce a very large feed of coal to such a size that 80% of the product passes through a 100

m screen, is 13 kWh per ton of feed. In a process, 250 ton h

of coal is crushed. The feed size is such that 80% of the feed passes through an opening of 100 mm. The product size range is to be such that 80% of the product passes through an opening of 25 mm. According to Bond’s law, which one of the following is the power consumption (in kW)?

Your answerChoose one option.

12.8

25.7

51.4

102.7

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In a certain project, 15% of the total investment is the working capital. The minimum acceptable rate of return is 4.95% and the period of evaluation is 15 years. Which one of the following is the maximum acceptable project payback period (in years)?

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A continuous distillation column is used to separate an equimolar mixture of diethylamine (DEA) and methanol. The feed enters the column as saturated liquid at a flow rate of 30 mol s

. It is desired to obtain 92 mol% DEA as distillate. The rate of withdrawal of the distillate from the column is 10 mol s

. The equilibrium curve for the conditions in the column is given below. The latent heat of vaporization of the reboiler contents is 35 kJ mol

. Neglect heat loss to the surroundings and assume constant molal overflow. Which one of the following is the minimum reboiler heat duty (in kW)?

Diagram for Chemical Engineering question 47

Your answerChoose one option.

350

700

1120

1470

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A gas stream with 2.01 mol % ammonia is to be scrubbed in a counter-current isothermal packed bed absorber using pure water to reduce its concentration to 0.01 mol %. Assume that dilute conditions apply, operating line is linear and the mass transfer coefficients are constant throughout the column. The liquid and the gas flows inside the absorber (in kmol m

) are 1000 and 200, respectively. The equilibrium relationship is

, where,

is the mole-fraction of ammonia in the gas phase and

is that in the liquid. Under these conditions, the height of overall gas transfer unit (

) is 0.8 m and the number of overall transfer units (

) is given by the following integral.

The integration is performed between the two ends of the column, and

is the equilibrium mole fraction in the gas phase, corresponding to the composition of the liquid at corresponding location. Which one of the following is the minimum length of the packing (in m) necessary to achieve the desired scrubbing?

Your answerChoose one option.

4.2

5.0

6.2

7.7

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Laboratory filtration is conducted at constant pressure drop of 200 kPa on a slurry of CaCO

in water at room temperature. The time taken to collect filtrate is shown in the table.

Filtrate volume collected (in m )	Time (in s)
	40
	100

The filter area is 0.05 m

and viscosity of filtrate is

Pa s. Which one of the following is the filter medium resistance (in m

Your answerChoose one option.

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Consider three identical non-interacting first order processes in series, each having unit gain and a time constant of 2 min. Tuning of proportional controller using closed loop Ziegler-Nichols technique is considered. Which one of the following is the ultimate period of sustained cycling (in min per cycle)?

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GATE CH exam:gate PYQs

Question 41

Question 42

Question 43

Question 44

Question 45

Question 46

Question 47

Question 48

Question 49

Question 50