Chemical Engineering Thermodynamics MCQs

Question 1

Pick out the wrong statement pertaining to the decomposition of PCl5 represented by, PCl5 ⇋ PCl3 + Cl2. Degree of dissociation of PCl5 will

Accepted Answer

None of these

Answer

Decrease on addition of Cl2

Answer

Increase on addition of an inert gas at constant pressure

Answer

Decrease on increasing the pressure of the system

Question 2

A gas mixture of three components is brought in contact with a dispersion of an organic phase in water. The degree of freedom of the system are

Accepted Answer

3

Answer

4

Answer

5

Answer

6

Question 3

The compressibility factor of a gas is given by (where, V1 = actual volume of the gas V2 = gas volume predicted by ideal gas law)

Accepted Answer

$$\frac{{{{	ext{V}}_1}}}{{{{	ext{V}}_2}}}$$

Answer

$$\frac{{{{	ext{V}}_2}}}{{{{	ext{V}}_1}}}$$

Answer

V1 - V2

Answer

V1 × V2

Question 4

Air enters an adiabatic compressor at 300 K. The exit temperature for a compression ratio of 3, assuming air to be an ideal gas $$\left( {\gamma = \frac{{{{	ext{C}}_{	ext{p}}}}}{{{{	ext{C}}_{	ext{v}}}}} = \frac{7}{5}} ight)$$ and the process to be reversible, is

Accepted Answer

$$300\left( {{3^{\frac{2}{7}}}} \right)$$

Answer

$$300\left( {{3^{\frac{3}{5}}}} \right)$$

Answer

$$300\left( {{3^{\frac{3}{7}}}} \right)$$

Answer

$$300\left( {{3^{\frac{5}{7}}}} \right)$$

Question 5

As the temperature is lowered towards the absolute zero, the value of the quantity $$\left( {\frac{{\partial \Delta {	ext{F}}}}{{\partial {	ext{T}}}}} ight)$$ approaches

Accepted Answer

Zero

Answer

Unity

Answer

Infinity

Answer

None of these

Question 6

Refrigeration capacity of a household refrigerator may be round about __________ tons.

Accepted Answer

0.15

Answer

1.5

Answer

4.5

Answer

6.5

Question 7

All gases during throttling process at atmospheric temperature and pressure show a cooling effect except

Accepted Answer

H2

Answer

CO2

Answer

O2

Answer

N2

Question 8

On opening the door of an operating refrigerator kept in a closed room, the temperature of the room will

Accepted Answer

Increase

Answer

Decrease

Answer

Remain same

Answer

Increase in summer and will decrease in winter

Question 9

The value of gas constant 'R' is

Accepted Answer

Both A and B

Answer

1.987 cal/gm mole °K

Answer

1.987 BTU/lb. mole °R

Answer

Neither A nor B