Download PDF
Free download in PDF Thermodynamics Short Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like IIT-JEE, AIIMS etc. These short solved questions or quizzes are provided by Gkseries.
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
42
The unit’of universal gas constant is
[A]
watts/°K
[B]
dynes/°C
[C]
ergscm/°K
[D]
erg/°K
43
I kgf/cm2 is equal to
[A]
760 mm Hg
[B]
zero mm Hg
[C]
735.6 mm Hg
[D]
1 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
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
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
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
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
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
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
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
Please share this page