Mechanical Engineering MCQs

A. Increase
B. Decrease
C. May increase or decrease depending on the type of refrigerant used
D. Remain unaffected

A. condenser
B. evaporator
C. absorber
D. condenser and absorber

A. 0.1 to 0.5 h.p. per ton of refrigeration
B. 0.5 to 0.8 h.p. per ton of refrigeration
C. 1 to 2 h.p. per ton of refrigeration
D. 2 to 5 h.p. per ton of refrigeration

A. Pressure lines
B. Temperature lines
C. Total heat lines
D. Entropy lines

A. Heat of compression
B. Work done by compressor
C. Enthalpy increase in compressor
D. All of the above

A. Increases cop
B. Decreases cof
C. Cop remains unaltered
D. Other factors decide cop

A. Bigger
B. Smaller
C. Equal
D. Smaller/bigger depending on capacity

A. It permits higher speeds to be used
B. It permits complete evaporation in the evaporator
C. It results in high volumetirc and mechanical efficiency
D. All of the above

A. Bigger cabinet should be used
B. Smaller cabinet should be used
C. Perfectly tight vapour seal should be used
D. Refrigerant with lower evaporation temperature should be used

A. The standard unit used in refrigeration problems
B. The cooling effect produced by melting 1 ton of ice
C. The refrigeration effect to freeze 1 ton of water at 0°c into ice at 0°c in 24 hours
D. The refrigeration effect to produce 1 ton of ice at ntp conditions