Mechanical Engineering MCQs

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

A. High
B. Low
C. Optimum
D. Any value

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

A. Vapour compression
B. Vapour absorption
C. Carnot cycle
D. Electrolux refrigerator

A. lowers evaporation temperature
B. increases power required per ton of refrigeration
C. lowers compressor capacity because vapour is lighter
D. reduces weight displaced by piston

A. Same
B. More
C. Less
D. More or less depending on ambient conditions

A. Freon-12
B. Nh3
C. C02
D. Freon-22

A. More
B. Less
C. Equally.
D. Unpredictable

A. More
B. Less
C. Same
D. More/less depending on size of plant

A. Ammonia vapour goes into solution
B. Ammonia vapour is driven out of solution
C. Lithium bromide mixes with ammonia
D. Weak solution mixes with strong solution