ESCO Employment Readiness Exam Review

Heat which causes a change in temperature of a substance is called

• sensible heat.

• heat capacity.

• latent heat.

• enthalpy change.

Heat added to a substance without a rise in temperature; (example: liquid refrigerant to gas) this process is called?

• sensible heat.

• superheat.

• latent heat.

• enthalpy change.

Heat added to the refrigerant in a vapor state after the evaporator process is called.

• sensible heat.

• superheat.

• latent heat.

• enthalpy change.

A scroll compressor moves refrigerant by means of.

• evaporator

• compressor

• involute spirals

• conduction

The movement of heat through a solid object is called.

• evaporator

• compressor

• involute spirals

• conduction

The movement of heat by way of fluid or is called air or gas.

• evaporator

• convection

• involute spirals

• conduction

A refrigerant gives up heat when it.

• it evaporates.

• it condenses.

• it compresses.

• it conducts.

The standard unit for measuring the QUANTITY of heat in a substance is (intensity would be temp)

• Newton
• Watt
• British thermal unit

• Kelvin

Why must refrigerant in the suction line be slightly warmer than the saturation temperature?

• To increase the efficiency of the compressor
• To prevent liquid refrigerant from entering the compressor.

• To prevent overheating of the refrigerant
• To reduce the overall system pressure

It is desirable for refrigerant in the suction line to be slightly superheated in order to.

• Prevent liquid refrigerant from entering the compressor
• Prevent overheating of the evaporator
• Reduce the cooling capacity of the system
• Increase the efficiency of the compressor