Thermodynamics MCQs | Thermodynamics Short Questions and Answers

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Questions
41 During throttling process
A heat exchange does not take place
B no work is done by expanding steam
C there is no change of internal energy of steam
D all of the above

Answer: all of the above
42 The unit’of universal gas constant is
A watts/°K
B dynes/°C
C ergscm/°K
D erg/°K

Answer: erg/°K
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43 I kgf/cm2 is equal to
A 760 mm Hg
B zero mm Hg
C 735.6 mm Hg
D 1 mm Hg

Answer: 735.6 mm Hg
44 A perpetual motion machine is
A a thermodynamic machine
B a non-thermodynamic machine
C a hypothetical machine
D a hypothetical machine whose opera-tion would violate the laws of thermodynamics

Answer: a hypothetical machine whose opera-tion would violate the laws of thermodynamics
45 Thermal power plant works on
A Carnot cycle
B Joule cycle
C Rankine cycle
D Otto cycle

Answer: Rankine cycle
46 The efficiency of a Carnot engine depends on
A working substance
B design of engine
C size of engine
D temperatures of source and sink

Answer: temperatures of source and sink
47 Stirling and Ericsson cycles are
A reversible cycles
B irreversible cycles
C quasi-static cycles
D semi-reversible cycles

Answer: reversible cycles
48 Which of the following cycles is not a reversible cycle
A Carnot
B Ericsson
C Stirling
D none of the above

Answer: more volume
49 The ideal efficiency of a Brayton cycle with regeneration, with increase in pressure ratio will
A increase
B decrease
C remain unchanged
D increase/decrease depending on ap-plication

Answer: decrease
50 If value of n is infinitely large in a polytropic process pV” = C, then the process is known as constant
A volume
B pressure
C temperature
D enthalpy

Answer: volume
51 The index of compression n tends to reach ratio of specific heats y when
A flow is uniform and steady
B process is isentropic
C process is isothermal
D process is isentropic and specific heat does not change with temperature

Answer: process is isentropic and specific heat does not change with temperature
52 Change in enthalpy of a system is the heat supplied at
A constant pressure
B constant temperature
C constant volume
D constant entropy

Answer: constant pressure
53 The term N.T.P. stands for
A nominal temperature and pressure
B natural temperature and pressure
C normal temperature and pressure
D normal thermodynamic practice

Answer: normal temperature and pressure
54 A heat exchange process in which the product of pressure and volume remains constant is known as
A heat exchange process
B throttling process
C isentropic process
D hyperbolic process

Answer: hyperbolic process
55 In an isothermal process, the internal energy of gas molecules
A increases
B decreases
C remains constant
D may increase/decrease depending on the properties of gas

Answer: remains constant
56 The basis for measuring thermodynamic property of temperature is given by
A zeroth law of thermodynamics
B first law of thermodynamics
C second law of thermodynamics
D third law of thermodynamics

Answer: zeroth law of thermodynamics
57 Work done is zero for the following process
A constant volume
B free expansion
C throttling
D all Of the above

Answer: all Of the above
58 For which of the following substances, the gas laws can be used with minimum error
A dry steam
B wet steam
C saturated steam
D superheated steam

Answer: superheated steam
59 In a non-flow reversible process for which p = (- 3V+ 15) x 105N/m2,V changes from 1 m to 2 m3. The work done will be about
A 100 xlOO5 joules
B lxlO5 joules
C 10 xlO5 joules
D 10 xlO5 kilo joules

Answer: 10 xlO5 joules
60 The value of the product of molecular weight and the gas characteristic constant for all the gases in M.K.S. unit is
A 29.27 kgfm/mol°K
B 8314kgfm/mol°K
C 848kgfm/mol°K
D 427kgfm/mol°K

Answer: 848kgfm/mol°K

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