REFRIGERATION AND AIR CONDITIONING QUIZ

Temperature and enthalpy

Temperature, pressure, specific volume and enthalpy

Specific volume and enthalpy

Temperature, pressure and enthalpy

All of these

It permits complete evaporation in the evaporator

It results in high volumetric and mechanical efficiency

It permits higher speeds to be used

Before passing through the condenser

After passing through the condenser

Before entering the expansion valve

After passing through the expansion or throttle valve

Humidification

Cooling and dehumidification

Dehumidification

Heating and humidification

Compressor

Evaporator

Condenser

Expansion valve

0.67

0.376

0.4

0.6

420 kJ/min

21 kJ/min

620 kJ/min

210 kJ/min

Zero work input

Maximum work input

Nearly same work input as for vapour compression cycle

Very little work input

High latent heat of vaporisation

All of these

Low boiling point

High critical temperature

All of these

Increases power required per ton of refrigeration

Lowers evaporation temperature

Lowers compressor capacity because vapour is lighter