Mechanical Engineering MCQs

Page No. 110

In order that a cycle be reversible, following must be satisfied ________________?


afree expansion or friction resisted expansion/compression process should not be encountered

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bwhen heat is being absorbed, temperature of hot source and working sub¬stance should be same

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cwhen beat is being rejected, temperature of cold source and working sub-stance should be same

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dall of the above

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View Answer all of the above

Which of the following processes are thermodynamically reversible___________________?


athrottling

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bfree expansion

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cconstant volume and constant pressure

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disothermal and adiabatic

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The specific heat of air increases with increase in __________________?


atemperature

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bpressure

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cboth pressure and temperature

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dvariation of its constituents

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View Answer temperature

In a free expansion process___________________?


awork done is zero

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bheat transfer is zero

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cboth A. and B. above

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dwork done is zero but heat increases

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View Answer both A. and B. above

The value of the product of molecular weight and the gas characteristic constant for all the gases in S.I. units is________________?


a29.27 J/kmol°K

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b83.14J/kmol°K

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c848J/kmol°K

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dAll J/kmol °K

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View Answer 83.14J/kmol°K

On volume basis, air contains following parts of oxygen _____________________?


a21

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b23

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c25

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d77

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View Answer 21

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_______________?


a100 xlOO5 joules

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blxlO5 joules

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c10 xlO5 joules

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d10 xlO5 kilo joules

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View Answer 10 xlO5 joules

Work done is zero for the following process_________________?


aconstant volume

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bfree expansion

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cthrottling

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dall Of the above

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View Answer all Of the above

The basis for measuring thermodynamic property of temperature is given by___________________?


azeroth law of thermodynamics

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bfirst law of thermodynamics

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csecond law of thermodynamics

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dthird law of thermodynamics

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Zeroth law of thermodynamics________________?


adeals with conversion of mass and energy

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bdeals with reversibility and irreversibility of process

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cstates that if two systems are both in equilibrium with a third system, they are in thermal equilibrium with each other

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ddeals with heat engines

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