Chemical Engineering Thermodynamics MCQs

Question 1

Isentropic process means a constant __________ process.

Accepted Answer

Entropy

Answer

Enthalpy

Answer

Pressure

Answer

None of these

Question 2

Joule-Thomson effect i.e., a throttling process is a constant __________ process.

Accepted Answer

Enthalpy

Answer

Entropy

Answer

Temperature

Answer

Internal energy

Question 3

Throttling (Joule-Thomson effect) process is a constant __________ process.

Accepted Answer

Enthalpy

Answer

Entropy

Answer

Pressure

Answer

None of these

Question 4

A refrigeration cycle is a reversed heat engine. Which of the following has the maximum value of the co-efficient of performance (COP) for a given refrigeration effect?

Accepted Answer

Carnot refrigeration cycle

Answer

Vapor compression cycle using expansion valve

Answer

Air refrigeration cycle

Answer

Vapor compression cycle using expansion engine

Question 5

A nozzle is a device, which

Accepted Answer

Increases kinetic energy and decreases pressure

Answer

Reduces kinetic energy and increases pressure

Answer

Reduces both kinetic energy and pressure

Answer

Increases both kinetic energy and pressure

Question 6

The first law of thermodynamics is a statement of conservation of

Accepted Answer

Energy

Answer

Heat

Answer

Momentum

Answer

Work

Question 7

The total change in the enthalpy of a system is independent of the

Accepted Answer

Number of intermediate chemical reactions involved

Answer

Pressure and temperature

Answer

State of combination and aggregation in the beginning and at the end of the reaction

Answer

None of these

Question 8

All gases above its inversion temperature, in a throttling process will show

Accepted Answer

A heating effect

Answer

No change in temperature

Answer

A cooling effect

Answer

Either A or C

Question 9

Which of the following is an undesirable characteristics of a refrigerant ?

Accepted Answer

It should have a sub-atmospheric vapor pressure at the temperature in refrigerator coils

Answer

It should be non-explosive

Answer

Its vapor pressure at the condenser temperature should be very high

Answer

None of these