thermodynamics MCQs – Page 6

Practise focused thermodynamics questions with marked answers for exam preparation and subject revision.

thermodynamics Mcqs
101. The term N.T.P. stands for________________________?
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A. natural temperature and pressure

B. normal thermodynamic pressure

C. normal thermodynamic practice

D. nominal temperature and pressure

E. normal temperature and pressure
102. An engine operates between temperatures of 900Kandr2 and another engine between T2 and 400K For both to do equal work, value of T2 will be________________?
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A. 750K

B. 625K

C. 600K

D. 700K

E. 650K
103. Thermal power plant works on______________?
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A. Rankine cycle

B. Carnot cycle

C. Joule cycle

D. Brayton cycle

E. Otto cycle

104. The unit of time in S.I. units is__________________?
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A. day

B. second

C. minute

D. hour

E. year.

105. Superheated vapour behaves___________________?
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A. approximately as a gas

B. as average of gas and vapour

C. exactly as gas

D. as steam

E. as ordinary vapour

106. Gases have___________________?
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A. under some conditions one value and sometimes two values of specific heat

B. two values of specific heat

C. three values of specific heat

D. no value of specific heat

E. only one value of specific heat

107. To convert volumetric analysis to gravimetric analysis, the relative volume of each constituent of the flue gases is____________________?
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A. multiplied by its specific weight

B. divided by its molecular weight

C. divided by its specific weight

D. multiplied by its molecular weight

E. multiplied by its density

108. On weight basis, air contains following parts of oxygen_________________?
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A. 21

B. 25

C. 23

D. 73

E. 79

109. The unit of mass in S.I. units is ____________________?
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A. kilogram

B. tonne

C. gram

D. quintal

E. newton

110. If value of n is infinitely large in a polytropic process pV = C, then the process is known as constant_____________________?
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A. entropy

B. volume

C. enthalpy

D. temperature

E. pressure

111. On volume basis, air contains following parts of oxygen _____________________?
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A. 79

B. 21

C. 23

D. 77

E. 25

112. Entropy change depends on___________________?
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A. mass transfer

B. change of temperature

C. change of pressure and volume

D. thermodynamic state

E. heat transfer
113. The unit of length in S.I. units is________________?
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A. kilometer

B. meter

C. centimeter

D. millimeter

114. The unitof universal gas constant is___________________?
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A. erg/K

B. watts/K

C. ergscm/K

D. dynes/C

E. none of the above

115. The efficiency of a Carnot engine depends on_______________________?
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A. type of fuel fired

B. design of engine

C. working substance

D. size of engine

E. temperatures of source and sink
116. Diesel cycle consists of following four processes_________________?
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A. two isentropics and two constant pressures

B. two isentropics, one constant volume and one constant pressure

C. two isentropics, and two constant volumes.

D. two isothermals and two isentropics

E. none of the above

117. If heat be exchanged in a reversible manner, which of the following property of the working substance will change accordingly_________________?
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A. internal energy

B. enthalpy

C. temperature

D. all of the above

E. entropy
118. No liquid can exist as liquid at____________________?
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A. in space

B. centre of earth

C. vacuum

D. 273 K

E. zero pressure
119. If a certain amount of dry ice is mixed with same amount of water at 80C, the final temperature of mixture will be__________________?
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A. 0C

B. 80C

C. 20C

D. 40C

E. 60C

120. The efficiency of Carnot cycle is maximum for_____________________?
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A. well lubricated engine

B. steam engine

C. gas engine

D. petrol engine

E. reversible engine