Mechanical Engineering MCQs

Page No. 146

In vapor compression cycle, the condition of refrigerant is very wet vapor________________?


aafter passing through the condenser

✖


bbefore passing through the condenser

✖


cafter passing through the expansion or throttle valve

✖


dbefore entering the compressor

✓



Clapeyron equation is applicable for registration at___________________?


asaturation point of vapor

✓


bsaturation point of liquid

✖


csublimation temperature

✖


dtriple point

✖



The relative coefficient of performance is_____________________?


aactual COP/fheoretical COP

✓


btheoretical COP/actual COP

✖


cactual COP x theoretical COP

✖


d1-actual COP x theoretical COP

✖



Which of the following cycles uses air as the refrigerant__________________?


aEricsson

✖


bStirling

✖


cCarnot

✖


dBell-coleman

✓


View Answer Bell-coleman

Two coplanar couples having equal and opposite moments_________________?


abalance each other

✖


bproduce a couple and an unbalanced force

✖


care equivalent

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dcan not balance each other

✓



On a ladder resting on smooth ground and leaning against vertical wall, the force of friction will be___________________?


atowards the wall at its upper end

✖


baway from the wall at its upper end

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caway from the wall at its upper end

✓


ddownwards at its upper end

✖



The ratio of limiting friction and normal reaction is known as _____________________?


acoefficient of friction

✓


bangle of friction

✖


cangle of repose

✖


dsliding friction

✖



Angle of friction is the_______________________?


aangle between normal reaction and the resultant of normal reaction and the limiting friction

✓


bratio of limiting friction and normal reaction

✖


cthe ratio of minimum friction force to the friction force acting when the body is just about to move

✖


dthe ratio of minimum friction force to friction force acting when the body is in motion

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If a suspended body is struck at the center of percussion, then the pressure on die axis passing through the point of suspension will be_________________?


amaximum

✖


bminimum

✖


czero

✓


dinfinity

✖


View Answer zero

Least force required to draw a body up the inclined plane is W sin (plane inclination + friction angle) applied in the direction___________________?


aalong the plane

✖


bhorizontally

✖


cvertically

✖


dat an angle equal to the angle of friction to the inclined plane

✓



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