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Engineering Thermodynamics MCQs (Grade 13)

Total questions: 50

Worksheet time: 25mins

Name
Class
Date
1.

Zeroth Law of Thermodynamics states that

a)

Energy can neither be created nor destroyed

b)

Entropy of an isolated system always increases

c)

If two systems are in thermal equilibrium with a third, they are in equilibrium with each other

d)

Heat always flows from hot to cold

2.

Which property is independent of the path followed?

a)

Work

b)

Heat

c)

Internal energy

d)

Power

3.

Which of the following is an intensive property?

a)

Mass

b)

Volume

c)

Internal energy

d)

Temperature

4.

For a closed system, the first law of thermodynamics is

a)

δQ=dU+δW\delta Q = dU + \delta W

b)

dU=δQ−δWdU = \delta Q - \delta W

c)

dU=δW−δQdU = \delta W - \delta Q

d)

δW=dU+δQ\delta W = dU + \delta Q

5.

Which process occurs at constant entropy?

a)

Isothermal

b)

Isobaric

c)

Isochoric

d)

Isentropic

6.

Which cycle is used in steam power plants?

a)

Otto cycle

b)

Diesel cycle

c)

Rankine cycle

d)

Brayton cycle

7.

The efficiency of a Carnot engine depends on

a)

Working substance

b)

Pressure ratio

c)

Temperature limits

d)

Heat input

8.

Entropy is a measure of

a)

Energy

b)

Disorder

c)

Temperature

d)

Work

9.

Which statement of the second law is Kelvin–Planck statement?

a)

Heat cannot flow from cold to hot without work

b)

Impossible to convert all heat into work in a cycle

c)

Entropy always decreases

d)

PMM1 is impossible

10.

PMM of second kind violates

a)

Zeroth law

b)

First law

c)

Second law

d)

Third law

11.

In throttling process, which property remains constant?

a)

Temperature

b)

Pressure

c)

Entropy

d)

Enthalpy

12.

Which device works on Brayton cycle?

a)

Gas turbine

b)

Steam turbine

c)

Reciprocating engine

d)

Refrigerator

13.

A system in which mass and energy cross the boundary is called

a)

Isolated system

b)

Closed system

c)

Open system

d)

Adiabatic system

14.

What is the unit of entropy?

a)

kJ

b)

kJ/kg

c)

kJ/kg-K

d)

kJ/K

15.

Which process has zero work transfer?

a)

Isothermal

b)

Isobaric

c)

Isochoric

d)

Polytropic

16.

In an adiabatic process

a)

Temperature remains constant

b)

No heat transfer occurs

c)

Pressure remains constant

d)

Volume remains constant

17.

What does a T–S diagram represent?

a)

Work transfer

b)

Heat transfer

c)

Internal energy

d)

Power

18.

For ideal gas, internal energy is a function of

a)

Pressure only

b)

Volume only

c)

Temperature only

d)

Pressure and volume

19.

Which law introduces the concept of entropy?

a)

Zeroth law

b)

First law

c)

Second law

d)

Third law

20.

Which refrigerant has zero ozone depletion potential?

a)

R-12

b)

R-22

c)

R-134a

d)

R-11

21.

Which property is NOT a thermodynamic property?

a)

Pressure

b)

Volume

c)

Velocity

d)

Temperature

22.

The triple point of water corresponds to

a)

0°C and 1 atm

b)

100°C and 1 atm

c)

Condition where all three phases coexist

d)

Only solid and liquid phases

23.

Which of the following is an extensive property?

a)

Pressure

b)

Temperature

c)

Density

d)

Enthalpy

24.

A reversible process is one which

a)

Occurs very fast

b)

Cannot be reversed

c)

Occurs with finite temperature difference

d)

Can be reversed without leaving any change in surroundings

25.

Which thermodynamic process is represented by a vertical line on P–V diagram?

a)

Isothermal

b)

Isobaric

c)

Isochoric

d)

Isentropic

26.

Heat transfer occurs due to

a)

Pressure difference

b)

Velocity difference

c)

Temperature difference

d)

Density difference

27.

Which cycle is used in petrol engines?

a)

Diesel cycle

b)

Brayton cycle

c)

Otto cycle

d)

Rankine cycle

28.

The quality of steam is defined as

a)

Ratio of volume of vapor to total volume

b)

Ratio of mass of vapor to total mass

c)

Ratio of mass of liquid to total mass

d)

Ratio of heat added to heat rejected

29.

Which process follows the relation PVPV = constant?

a)

Isothermal

b)

Isentropic

c)

Isobaric

d)

Isochoric

30.

A gas compressed slowly in an insulated cylinder undergoes

a)

Isothermal process

b)

Isobaric process

c)

Adiabatic process

d)

Isochoric process

31.

Which of the following is NOT a cycle?

a)

Carnot

b)

Rankine

c)

Otto

d)

Polytropic

32.

The thermal efficiency of a heat engine is

a)

Work output / Heat input

b)

Heat input / Work output

c)

Heat rejected / Heat input

d)

Work output / Heat rejected

33.

Which statement is correct for an isolated system?

a)

Energy transfer only

b)

Mass transfer only

c)

No mass and energy transfer

d)

Only heat transfer

34.

Enthalpy is defined as

a)

U−PVU - PV

b)

U+PVU + PV

c)

P−VTP - VT

d)

U−VTU - VT

35.

Which property becomes zero at absolute zero temperature?

a)

Enthalpy

b)

Internal energy

c)

Entropy

d)

Pressure

36.

Which of the following devices is a heat engine?

a)

Refrigerator

b)

Heat pump

c)

Steam turbine

d)

Air conditioner

37.

Which law sets the upper limit on efficiency of heat engines?

a)

Zeroth law

b)

First law

c)

Second law

d)

Third law

38.

In a steady-flow process

a)

Properties vary with time

b)

Mass flow rate is constant

c)

Energy is stored

d)

No work is done

39.

The slope of T–S diagram gives

a)

Work transfer

b)

Pressure

c)

Heat transfer

d)

Specific volume

40.

Which refrigerant is commonly used in domestic refrigerators?

a)

Ammonia

b)

R-134a

c)

CO 2_2

d)

Water

41.

A process in which no work is done but heat is transferred is

a)

Isochoric

b)

Isothermal

c)

Isentropic

d)

Adiabatic

42.

Which thermodynamic cycle is ideal for gas turbines?

a)

Otto

b)

Diesel

c)

Rankine

d)

Brayton

43.

What is the SI unit of enthalpy?

a)

kJ

b)

kJ/kg

c)

kJ/kg-K

d)

kJ/K

44.

For an ideal gas, Cp−CvC_p - C_v equals

a)

Zero

b)

RR

c)

1

d)

γ\gamma

45.

Which process gives maximum work output?

a)

Irreversible process

b)

Reversible process

46.

A control volume refers to

a)

Closed system

b)

Isolated system

c)

Open system

d)

Adiabatic system

47.

Which process is represented by a horizontal line on a T–S diagram?

a)

Isothermal

b)

Isobaric

c)

Isochoric

d)

Isentropic

48.

The COP of a refrigerator is defined as

a)

Work input / Refrigeration effect

b)

Refrigeration effect / Work input

c)

Heat rejected / Work input

d)

Heat absorbed / Heat rejected

49.

Which of the following increases entropy?

a)

Reversible process

b)

Irreversible process

c)

Isentropic process

d)

Ideal process

50.

Which of the following best defines thermodynamics?

a)

Study of heat only

b)

Study of energy, heat, and work

c)

Study of temperature only

d)

Study of fluids

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