Mechanical Engineering MCQs

Page No. 137

The materials having same elastic properties in all directions are called________________?


aideal materials


buniform materials


cisotropic materials


dparactical materials


View Answer isotropic materials

Deformation per unit length in the direction of force is known as_________________?


astrain


blateral strain


clinear strain


dlinear stress


View Answer linear strain

Young’s modulus is defined as the ratio of ___________________?


avolumetric stress and volumetric strain


blateral stress and lateral strain


clongitudinal stress and longitudinal strain


dshear stress to shear strain



In a vapor compression cycle, the refrigerant immediately after expansion valve is___________________?


aliquid


bsub-cooled liquid


csaturated liquid


dwet vapour


View Answer wet vapour

Absorption system normally uses the following refrigerant___________________?


aFreon-11


bFreon-22


cC02


dammonia


View Answer ammonia

Highest temperature encountered in refrigeration cycle should be________________?


anear critical temperature of refrigerant


babove critical temperature


cat critica. temperature


dat critica. temperature



One of the purposes of sub-cooling the liquid refrigerant is to________________?


areduce compressor overheating


breduce compressor discharge temperature


cincrease cooling effect


densure that only liquid and not the vapour enters the expansion (throttling) valve



In a refrigeration system, heat absorbed in comparison to heat rejected is_________________?


amore


bless


csame


dmore for small capacity and less for high capacity


View Answer less

Formation of frost on evaporator in refrigerator ________________?


aresults in loss of heat due to poor heat transfer


bincreases heat transfer rate


cis immaterial


dcan be avoided by proper design



At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant_________________?


adecreases


bincreases


cremains same


ddepends on other factors


View Answer increases

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