Mechanical Engineering MCQs

Page No. 105

The energy of molecular motion appears as________________?


aheat

✓


bpotential energy

✖


csurface tension

✖


dfriction

✖


View Answer heat

The unit’of universal gas constant is___________________?


awatts/°K

✖


bdynes/°C

✖


cergscm/°K

✖


derg/°K

✓


View Answer erg/°K

I kgf/cm2 is equal to________________?


a760 mm Hg

✖


bzero mm Hg

✖


c735.6 mm Hg

✓


d1 mm Hg

✖


View Answer 735.6 mm Hg

One barometric pressure or 1 atmospheric pressure is equal to___________________?


a1 kgf/cnr2

✖


b1.033 kgf/cm2

✓


c0 kgf/cm2

✖


d1.0197 kgf/cm2

✖


View Answer 1.033 kgf/cm2

A perpetual motion machine is___________________?


aa thermodynamic machine

✖


ba non-thermodynamic machine

✖


ca hypothetical machine

✖


da hypothetical machine whose opera-tion would violate the laws of thermodynamics

✓



According to Clausis statement of second law of thermodynamics___________________?


aheat can’t be transferred from low temperature source to high temperature source

✖


bheat can be transferred for low temperature to high temperature source by using refrigeration cycle.

✖


cheat can be transferred from low temperature to high temperature source if COP of process is more than unity

✖


dheat can’t be transferred from low temperature to high temperature source without the aid of external energy

✓



Which of the following is an irreversible cycle_____________________?


acarnot

✖


bStirling

✖


cericsson

✖


dnone of the above

✓


View Answer none of the above

The efficiency of a Carnot engine depends on_______________________?


aworking substance

✖


bdesign of engine

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csize of engine

✖


dtemperatures of source and sink

✓



The efficiency of Carnot cycle is maximum for_____________________?


agas engine

✖


bwell lubricated engine

✖


cpetrol engine

✖


dreversible engine

✓


View Answer reversible engine

Diesel cycle consists of following four processes_________________?


atwo isothermals and two isentropics

✖


btwo isentropics, and two constant volumes.

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ctwo isentropics, one constant volume and one constant pressure

✓


dtwo isentropics and two constant pressures

✖



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