thermodynamics MCQs – Page 7

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

thermodynamics Mcqs

121. Isochoric process is one in which___________________?
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A. free expansion takes place

B. very little mechanical work is done by the system

C. no mechanical work is done by the system

D. mass and energy transfer do not take place

E. all parameters remain constant

122. Total heat of a substance is also known as __________________?
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A. thermal capacity

B. enthalpy

C. thermal conductance

D. entropy

E. internal energy

123. Extensive property of a system is one whose value______________________?
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A. is dependent on the path followed and not on the state

B. is not dependent on the path followed but on the state

C. depends on the mass of the system like volume

D. does not depend on the mass of the system, like temperature, pressure, etc.

E. is always constant

124. A manufacturer claims to have a heat engine capable of developing 20 h.p. by receiving heat input of 400 kcal/mt and working between the temperature limits of 227 C and 27 C. His claim is__________________?
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A. may be possible with lot of sophistications

B. theroretically possible

C. cost will be very high

D. not possible

E. justified

125. Calorie is a measure of
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A. work

B. thermal capacity

C. entropy

D. specific heat

E. quantity of heat

126. Which of the following is the property of a system___________________?
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A. enthalpy and entropy

B. pressure and temperature

C. volume and density

D. all of the above

E. internal energy

127. For which of the following substances, the gas laws can be used with minimum error_________________?
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A. wet steam

B. dry steam

C. saturated steam

D. superheated steam

E. steam at atmospheric pressure

128. In an isothermal process, the internal energy of gas molecules________________?
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A. decreases

B. increases

C. remains constant

D. may increase/decrease depending on the properties of gas

E. shows unpredictable behaviour

129. A cycle consisting of two adiabatics and two constant pressure processes is known as___________________?
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A. Stirling cycle

B. Ericsson cycle

C. Atkinson cycle

D. Joule cycle

E. Otto cycle

130. The more effective way of increasing efficiency of Carnot engine is to____________________?
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A. increase higher temperature

B. keep lower temperature constant

C. increase lower temperature

D. decrease lower temperature

E. decrease higher temperature

131. Stirling and Ericsson cycles are__________________?
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A. reversible cycles

B. semi-reversible cycles

C. adiabatic irreversible cycles

D. quasi-static cycles

E. irreversible cycles

132. According to kinetic theory of gases, the absolute zero temperature is attained when___________________?
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A. kinetic energy of the molecules is zero

B. specific heat of gas is zero

C. mass is zero

D. pressure of the gas is zero

E. volume of the gas is zero

133. Work done in an adiabatic process between a given pair of end states depends on__________________?
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A. particular adiabatic process

B. the value of index n

C. the end states only

D. the value of heattransferred

E. mass of the system

134. The value of the product of molecular weight and the gas characteristic constant for all the gases in S.I. units is________________?
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A. All J/kmol K

B. 83.14J/kmolK

C. 29.27 J/kmolK

D. 848J/kmolK

E. 735 J/kmol K

135. Work done in a free expansion process is___________________?
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A. zero

B. #NAME?

C. #NAME?

D. minimum

E. maximum

136. The value of the product of molecular weight and the gas characteristic constant for all the gases in M.K.S. unit is______________________?
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A. 848kgfm/molK

B. 735 kgfm/molK

C. 8314kgfm/molK

D. 29.27 kgfm/molK

E. 427kgfm/molK

137. The energy of molecular motion appears as________________?
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A. potential energy

B. heat

C. surface tension

D. increase in pressure

E. friction

138. Which of the following cycles has maximum efficiency_____________?
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A. Rankine

B. Carnot

C. Brayton

D. Stirling

E. Joule

139. Kelvin Plancks law deals with___________________?
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A. conservation of mass

B. conversion of heat into work

C. conservation of work

D. conversion fo work into heat

E. conservation of heat

140. The thermodynamic difference between a Rankine cycle working with saturated steam and the Carnot cycle is that___________________?
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A. none of the above

B. heat is supplied to water at temperature below the maximum temperature of the cycle

C. carnot cycle cant work with saturated steam

D. a rankine cycle receives heat at two places

E. rankine cycle is hypothetical

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