Formation of frost on evaporator in refrigerator ________________?

A. Results in loss of heat due to poor heat transfer
B. Increases heat transfer rate
C. Is immaterial
D. Can be avoided by proper design

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

A. More
B. Less
C. Same
D. More for small capacity and less for high capacity

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

A. Reduce compressor overheating
B. Reduce compressor discharge temperature
C. Increase cooling effect
D. Ensure that only liquid and not the vapour enters the expansion (throttling) valve

Highest temperature encountered in refrigeration cycle should be________________?

A. Near critical temperature of refrigerant
B. Above critical temperature
C. At critica. temperature
D. Much below critical temperature

Absorption system normally uses the following refrigerant___________________?

A. freon-11
B. freon-22
C. c02
D. s02

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

A. Liquid
B. Sub-cooled liquid
C. Saturated liquid
D. Wet vapour

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

A. Volumetric stress and volumetric strain
B. Lateral stress and lateral strain
C. Longitudinal stress and longitudinal strain
D. Shear stress to shear strain

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

A. Strain
B. Lateral strain
C. Linear strain
D. Linear stress

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

A. Ideal materials
B. Uniform materials
C. Isotropic materials
D. Paractical materials

Strain is defined as the ratio of__________________?

A. Change in volume to original volume
B. Change in length to original length
C. Change in cross-sectional area to original cross-sectional area
D. Any one of the above