Mechanical Engineering MCQs

Page No. 137

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


aideal materials

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buniform materials

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cisotropic materials

✓


dparactical materials

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View Answer isotropic materials

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


astrain

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blateral strain

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clinear strain

✓


dlinear stress

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View Answer linear strain

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


avolumetric stress and volumetric strain

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blateral stress and lateral strain

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clongitudinal stress and longitudinal strain

✓


dshear stress to shear strain

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


aliquid

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bsub-cooled liquid

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csaturated liquid

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dwet vapour

✓


View Answer wet vapour

Absorption system normally uses the following refrigerant___________________?


aFreon-11

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bFreon-22

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cC02

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dammonia

✓


View Answer ammonia

Highest temperature encountered in refrigeration cycle should be________________?


anear critical temperature of refrigerant

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babove critical temperature

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cat critica. temperature

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dat critica. temperature

✓



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


areduce compressor overheating

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breduce compressor discharge temperature

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cincrease cooling effect

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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

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bless

✓


csame

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dmore for small capacity and less for high capacity

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View Answer less

Formation of frost on evaporator in refrigerator ________________?


aresults in loss of heat due to poor heat transfer

✓


bincreases heat transfer rate

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cis immaterial

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dcan be avoided by proper design

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


adecreases

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bincreases

✓


cremains same

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ddepends on other factors

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View Answer increases

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