165) Short horizontal lines on pressure-enthalpy chart show

constant pressure lines

constant temperature lines

constant total heat lines

constant entropy lines

Answer is:

constant pressure lines

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166) On the pressure-enthalpy diagram, condensation and desuperheating is represented by a horizontal line because the process

involves no change in volume

takes place at constant temperature

takes place at constant entropy

takes place at constant pressure.

Answer is:

takes place at constant pressure.

167) One ton of the refrigeration is

the standard unit used in refrigeration problems

the cooling effect produced by melting 1 ton of ice

the refrigeration effect to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours

the refrigeration effect to produce 1 ton of ice at NTP conditions

Answer is:

the refrigeration effect to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours

168) Superheating in a refrigeration cycle

increases COP

decreases COP

COP remains unaltered

other factors decide COP

Answer is:

decreases COP

169) For proper refrigeration in a cabinet, if the temperature and vapour pressure difference between cabinet and atmosphere is high, then

bigger cabinet should be used

smaller cabinet should be used

perfectly tight vapour seal should be used

refrigerant with lower evaporation temperature should be used

Answer is:

perfectly tight vapour seal should be used

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165) Short horizontal lines on pressure-enthalpy chart show

constant pressure lines

Heat transfer MCQ with Answers

Related Heat transfer MCQ with Answers

166) On the pressure-enthalpy diagram, condensation and desuperheating is represented by a horizontal line because the process

takes place at constant pressure.

167) One ton of the refrigeration is

the refrigeration effect to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours

168) Superheating in a refrigeration cycle

decreases COP

169) For proper refrigeration in a cabinet, if the temperature and vapour pressure difference between cabinet and atmosphere is high, then

perfectly tight vapour seal should be used

Heat transfer MCQ with Answers