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


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


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



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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