Thermodynamics MCQ Questions Answers Mechanical Engineering

21) For reversible adiabatic process, change in entropy is

a) maximum

b) minimum

c) zero

d) unpredictable

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Option – c)

22) Which of the following is not a conserved quantity ?

a) Mass

b) Energy

c) Momentum

d) Exergy

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Option – d)

23) Which of the following thermodynamic relation is Keenan function ?

a) U + PV

b) H – T0 S

c) E – T0 S

d) U – T0 S

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Option – b)

24) The slope of sublimation curve on P-T diagram for all substances is

a) zero

b) infinite

c) positive

d) negative

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Option – c)

25) Triple point is the point in

a) p-V diagram

b) p-T diagram

c) h-S diagram

d) T-S diagram

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Option – b)

26) A gas which obeys kinetic theory perfectly is known as

a) Perfect gas

b) Real gas

c) Monoatomic gas

d) Diatomic gas

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Option – a)

27) For an ideal gas the value of Joule Thomson coefficient is

a) zero

b) 0.5

c) unity

d) infinite

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Option – a)

28) In the van der Waal’s equation, the unit of constant a is

a) N m5

b) N m2

c) N m3

d) N m4

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Option – d)

29) Gibb’s free energy (G) is given by

a) G = H – TS

b) G =H/TS

c) G = U – TS

d) None of these

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Option – a)

30) The clausius-clapeyron equation gives the slope of a curve in

a) p-V diagram

b) P-h diagram

c) p-T diagram

d) T-s diagram

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Option – c)