Chemical Engineering Thermodynamics MCQs

Question 1

A change in state involving a decrease in entropy can be spontaneous, only if

Accepted Answer

It is exothermic

Answer

It is isenthalpic

Answer

It takes place isothermally

Answer

It takes place at constant volume

Question 2

For water at 300°C, it has a vapour pressure 8592.7 kPa and fugacity 6738.9 kPa Under these conditions, one mole of water in liquid phase has a volume of 25.28 cm3 and that in vapour phase in 391.1 cm3. Fugacity of water (in kPa) at 9000 kPa will be

Accepted Answer

6753.5

Answer

6738.9

Answer

7058.3

Answer

9000

Question 3

The equation, Cp - Cv = R, is true for __________ gas.

Accepted Answer

Only ideal

Answer

No

Answer

Any real

Answer

Both B and C

Question 4

Duringthe phase transition, __________ changes.

Accepted Answer

Volume

Answer

Pressure

Answer

Temperature

Answer

All of the above

Question 5

The specific heat of saturated water vapour at 100°C is

Accepted Answer

-ve

Answer

∞

Answer

0

Answer

+ve

Question 6

Efficiency of a heat engine working on Carnot cycle between two temperature levels depends upon the

Accepted Answer

Two temperatures only

Answer

Pressure of working fluid

Answer

Mass of the working fluid

Answer

Mass and pressure both of the working fluid

Question 7

Efficiency of a Carnot engine working between temperatures T1 and T2 (T1 < T2) is

Accepted Answer

$$\frac{{{{	ext{T}}_2} - {{	ext{T}}_1}}}{{{{	ext{T}}_2}}}$$

Answer

$$\frac{{{{	ext{T}}_2} - {{	ext{T}}_1}}}{{{{	ext{T}}_1}}}$$

Answer

$$\frac{{{{	ext{T}}_1} - {{	ext{T}}_2}}}{{{{	ext{T}}_2}}}$$

Answer

$$\frac{{{{	ext{T}}_1} - {{	ext{T}}_2}}}{{{{	ext{T}}_1}}}$$

Question 8

Co-efficient of performance for a reversed Carnot cycle working between temperatures T1 and T2 (T1 > T2) is

Accepted Answer

$$\frac{{{{	ext{T}}_2}}}{{{{	ext{T}}_1} - {{	ext{T}}_2}}}$$

Answer

$$\frac{{{{	ext{T}}_1}}}{{{{	ext{T}}_1} - {{	ext{T}}_2}}}$$

Answer

$$\frac{{{{	ext{T}}_1} - {{	ext{T}}_2}}}{{{{	ext{T}}_1}}}$$

Answer

$$\frac{{{{	ext{T}}_1} - {{	ext{T}}_2}}}{{{{	ext{T}}_2}}}$$

Question 9

The following heat engine produces power of 100000 kW. The heat engine operates between 800 K and 300 K. It has a thermal efficiency equal to 50% of that of the Carnot engine for the same temperature. The rate at which heat is absorbed from the hot reservoir is

Accepted Answer

320, 000 kW

Answer

100, 000 kW

Answer

160, 000 kW

Answer

200, 000 kW