In this lecture we discuss the topic Thermodynamics MCQ Question and Answers, so lets see some important mcq questions 

Thermodynamics mcq question and answers

Thermodynamics MCQ Question and Answers

1) Internal combustion engine works on 

a) second law of thermodynamics 

b) first law of thermodynamics 

c) both (a) and (b)

d) none of above 

Ans:- (b)

2) Work done is zero in case of 

a) adiabatic process

b) adiabatic process

c) constant volume process

d) isothermal process

Ans:- (c)

3) In adiabatic process 

a) there is no flow of heat into and out of the system

b) pressure and volume remains constant 

c) temperature remains constant 

d) none of above

Ans:- (a)

4) During throttling process enthlpy 

a) remains constant

b) decrease

c) increase

d) none of above

Ans:- (a)

5) In refrigeration cycle, the heat is absorbed by a refrigerant in a

a) expansion valve 

b) compressor 

c) evaporator

d) condenser

Ans:- (c)

6) Refrigerant cycle, heat is rejected by a refrigerant in a 

a) compressor

b) condenser

c) compressor

d) expansion valve

Ans:- (b)

7) Temperature of air recorded by ordinary thermometer called 

a) wet bulb temperature

b) dry bulb temperature

c) saturation temperature

d) dew point temperature

Ans:- (b)

8) Mass of water vapour present in 1kg dryair is called  as 

a) humidity ratio

b) absolute humidity

c) both (a) and (b)

d) relative humidity

Ans:- (a)

9) Humidity ratio is also known as 

a) absolute humidity

b) specific humidity

c) humidity percentage 

d) none of above

Ans:- (b)

10) Wet bulb depression indicates

a) absolute humidity

b) relative humidity

c) percentage humidity

d) none of above

Ans:- (b)

11) In psychrometric chart, vertical lines indicates that

a) dry bulb temperature 

b) wet bulb temperature 

c) dew point temperature

d) both (a) and (b)

Ans:- (a)

12) psychrometric process is 

a) sensible heating 

b) humidification 

c) dehumidification 

d) all of these

Ans:- (d)

13) Dew point temperature lines in the psychrometric chart 

a) vertical

b) inclined

c) curved

d) horizontal

Ans:- (d)

14) In spray humidification process, total heat 

a) remain same

b) decreases

c) increases

d) none of these

Ans:- (a)

15) Air conditioning means 

a) cooling and heating

b) dehumidifying

c) remove air impurities

d) all of these

Ans:- (d)

16) Subcooling occurs when the vapour 

a) has high latent heat

b) remove sensible heat from refrigerant 

c) has low latent heat 

d) none of these

Ans:- (b) 

17) Carnot cycle, process is carried extremely slow speed is 

a) isothermal compression 

b) adiabatic compression

c) adiabatic expansion 

d) all of these

Ans:- (d)

18) Carnot cycle has maximum efficiency for 

a) petrol engine 

b) reversible engine 

c) diesel engine

d) irreversible engine

Ans:- (c)

19) In throttling process 

a) W=0

b) E=0

c) H=0

d) all of these

Ans:- (d)

20) Control volumes refers to 

a) specific mass

b) fix region in space

c) closed system

d) none of above

Ans:- (b)

21) An isothermal process, internal energy 

a) increases

b) remains constant

c) decreases

d) none of these

Ans:- (b)

22) Which of the following statements is true for a closed system?

A) Mass can enter or leave the system.

B)  Neither mass nor energy can enter or leave the system.

C) Both mass and energy can enter or leave the system.

D) None Of these.

Answer: B) Energy can enter or leave the system.

23) The Zeroth Law of Thermodynamics helps to define which fundamental concept?

A) Heat

B) Work

C) Temperature

D) Entropy

Answer: C) Temperature

24) The First Law of Thermodynamics is a statement of the conservation of which quantity?

A) Momentum

B) Mass

C) Energy

D) Charge

Answer: C) Energy

25) which of the following remains constant?

A) Pressure

B) Volume

C) Temperature

D) Internal energy

Answer: C) Temperature

26) Which law of thermodynamics states that the entropy of a perfect crystal at absolute zero is zero?

A) Zeroth Law

B) First Law

C) Second Law

D) Third Law

Answer: D) Third Law

27) Carnot engine efficiency depends on which of the following?

A) The working substance

B) The heat source and sink temperatures

C) The amount of work done

D) The type of fuel used

Answer: B) The heat source and sink temperatures

28) Unit of entropy in International System of Units (SI)?

A) Joule (J)

B) Watt (W)

C) Joule per Kelvin (J/K)

D) Kelvin (K)

Answer: C) Joule per Kelvin (J/K)

29) In an adiabatic process, which of the following is true?

A) No heat is transferred to or from the system.

B) No work is done on or by the system.

C) The temperature remains constant.

D) The internal energy remains constant.

Answer: A) No heat is transferred to or from the system.

30) Which of the following processes is non-reversible?

A) Isothermal expansion

B) Adiabatic compression

C) Free expansion

D) Quasi-static expansion

Answer: C) Free expansion

So in this lecture we study some Thermodynamics MCQ Question and Answers that helps for information to thermodynamics. Hope you understand well.

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