Thermodynamics MCQs | Thermodynamics Multiple Choice Questions with Answers

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Questions
61 Universal gas constant is defined as equal to product of the molecular weight of the gas and
A specific heat at constant pressure
B specific heat at constant volume
C ratio of two specific heats
D gas constant

Answer: gas constant
62 The value of the product of molecular weight and the gas characteristic constant for all the gases in S.I. units is
A 29.27 J/kmol°K
B 83.14J/kmol°K
C 848J/kmol°K
D All J/kmol °K

Answer: 83.14J/kmol°K
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63 In a free expansion process
A work done is zero
B heat transfer is zero
C both (a) and (b) above
D work done is zero but heat increases

Answer: both (a) and (b) above
64 If a fluid expands suddenly into vacuum through an orifice of large dimension, then such a process is called
A free expansion
B hyperbolic expansion
C adiabatic expansion
D parabolic expansion

Answer: free expansion
65 Which of the following processes is irreversible process
A isothermal
B adiabatic
C throttling
D all of the above

Answer: throttling
66 For a thermodynamic process to be reversible, the temperature difference between hot body and working substance should be
A zero
B minimum
C maximum
D infinity

Answer: zero
67 Molecular volume of any perfect gas at 600 x 103 N/m2 and 27°C will be
A 4.17m3/kgmol
B 400 m3/kg mol
C 0.15 m3/kg mol
D 41.7 m3/kg mol

Answer: 4.17m3/kgmol
68 The more effective way of increasing efficiency of Carnot engine is to (a) (b) (c) (d) (e) keep lower temperature constant. Ans: d
A increase higher temperature
B decrease higher temperature
C increase lower temperature
D decrease lower temperature

Answer: decrease lower temperature
69 Entropy change depends on
A heat transfer
B mass transfer
C change of temperature
D thermodynamic state

Answer: heat transfer
70 According to first law of thermodynamics
A work done by a system is equal to heat transferred by the system
B total internal energy of a system during a process remains constant
C internal energy, enthalpy and entropy during a process remain constant
D total energy of a system remains constant

Answer: total energy of a system remains constant
71 Energy can neither be created nor destroyed but can be converted from one form to other is inferred from
A zeroth low of thermodynamic
B first law of thermodynamics
C second law to thermodynamics
D basic law of thermodynamics

Answer: first law of thermodynamics

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