# Applied thermodynamics multiple choice questions with answers

Get important and free Applied thermodynamics multiple choice questions with answers. In this blog post, you will get multiple-choice questions on Applied thermodynamics. In the previous post (Set 1), we posted 28 MCQs. This is set 2.

Set 1: Applied Thermodynamics MCQ

## Set 2: Applied thermodynamics multiple-choice questions

1. Among the following statements, which one is FALSE for a closed system undergoing an irreversible process?

Its entropy always increases during a heating process.

Its entropy always decreases during a cooling process

Its entropy can decrease or increase during a cooling process, depending on the magnitude of heat transfer involved

Its entropy always increases during an adiabatic process

2. A system is maintained at a temperature lower than its immediate surrounding. Its exergy is

positive

negative

zero

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3. Irreversibility for a heat pump can be defined as

reversible work – useful work

useful work – reversible work

useful work – surrounding work

actual work – surrounding work

4. Joule-Thomson coefficient for an ideal gas is

positive

negative

zero

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5.A substance can be used as a refrigerant when

its temperature is greater than the maximum inversion temperature and the Joule-Thomson coefficient is positive.

its temperature is greater than the maximum inversion temperature and the Joule-Thomson coefficient is negative.

its temperature is lesser than the maximum inversion temperature and the Joule-Thomson coefficient is positive.

its temperature is lesser than the maximum inversion temperature and the Joule-Thomson coefficient is negative.

6. Among the followings, which conclusion can be drawn from the Mayer relation?

Isobaric specific heat is always greater than isochoric specific heat.

Difference between isobaric and isochoric specific heats vanishes at absolute zero temperature.

Both specific heats are identical for a purely incompressible substance.

All of the above.

7. Among the following statements, which one is TRUE for a substance which expands on freezing?

It can stay as liquid below its triple point temperature.

It can stay as liquid below its triple point pressure.

It can stay as solid above its triple point temperature.

It cannot stay as vapor below its triple point pressure.

8. Compressibility factor for an ideal gas is

zero

positive, but less than one

one

greater than one

9. A real gas is likely to resemble the ideal gas behavior at

low temperature and low pressure

low temperature and high pressure

high temperature and low pressure

high temperature and high pressure

10. Density of a sample of water is found to be greater than the density of saturated liquid water at the same temperature. Then the thermodynamic state of this sample is

compressed liquid

saturated liquid

saturated liquid-vapor mixture

superheated vapor

11. Some quantity of water is supplied with 10 MPa pressure and 0.003 m3/kg specific volume. The thermodynamic state of this particular sample can be identified as

compressed liquid

saturated liquid

saturated liquid-vapor mixture

superheated vapor

12. Compression ratio of a reciprocating engine is defined as the ratio of

maximum to minimum pressure

maximum to minimum volume

maximum to minimum temperature

expansion to compression work

13. An Otto cycle is characterized by

isochoric heat addition and isochoric heat rejection

isobaric heat addition and isochoric heat rejection

isochoric heat addition and isobaric heat rejection

isobaric heat addition and isobaric heat rejection

14. Thermal efficiency of an Otto cycle is

inversely proportional to the compression ratio, but directly proportional to the ratio of specific heat

inversely proportional to the ratio of specific heat, but directly proportional to the compression ratio

inversely proportional to both the compression ratio and the ratio of specific heat

directly proportional to both the compression ratio and the ratio of specific heat

15. An Ericsson cycle comprises of

two isothermal and two isentropic processes

two isothermal and two isochoric processes

two isothermal and two isobaric processes

two isochoric and two isobaric processes

16. Among the followings, which one is not considered in fuel-air cycle?

chemical composition of gas

chemical non-equilibrium

dissociation

change in gas volume

17. Effect of dissociation is

to reduce cycle thermal efficiency

to reduce specific power output of the cycle

to reduce maximum cycle temperature

all of the above

18. With dissociation, the peak temperature is obtained

at the stoichiometric fuel-air ratio

when the mixture is slightly lean

when the mixture is slightly rich

none of the above

19. With dissociation, the exhaust gas temperature

decreases

increases

remains unchanged

increases till certain A/F and then decreases

20. The practical efficiency of a good engine is ________ of the estimated fuel-air efficiency.

100%

85%

50%

37%

21. For a compression process with variable specific heat, the peak temperature and pressure are

lower

higher

unchanged

inversely proportional

22. When the spark is advanced, work output is less as

the peak pressure is low

the peak temperature is low

additional work is required to compress the burning gas

frictional losses increases

23. The major source of loss in a CI engine is

direct heat loss

incomplete combustion loss

rubbing friction loss

pump

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