Electricity Unit 15 review Quiz

Which of the following terminals controls the compressor contactor on a typical heat pump thermostat?

• Y

• O

• W2

• C

A defrost thermostat used to control the defrost cycle on an air-to-air heat pump is an open on rise of temperature switch located on the ___________________.

• Indoor coil

• Outdoor coil

• Suction line

• Compressor

A device used to reverse the flow of refrigerant in a mechanical refrigeration system best describes a _____________________.

• Thermostatic expansion valve

• Reversing valve

• Check valve

• Solenoid valve

A residential fan-coil unit typically contains the __________________________.

• Blower and condenser coil

• Condenser fan and condenser coil

• Fan, evaporator coil, and compressor

• Blower and evaporator coil

A technician should give the appearance to the customer that they are ___________________.

• Well trained

• Professional and organized

• Competent

• All of the choices are correct

Air-to-air heat pumps must periodically defrost during the _____________ mode(s) of operation.

• Heating

• Cooling

• Heating and cooling

• Emergency heat

Improper field control wiring connections could result in ___________________.

• Damage to control devices

• Improper system operation

• Reduced equipment life

• All of the choices are correct

On a heating and cooling split-system with a condensing type gas furnace, the condensate overflow detection device is typically wired in series between the ___________________________.

• Thermostat Y terminal on the condensing unit contactor

• R terminal on the furnace and the R terminal on the thermostat

• R and Y terminals on the thermostat

• C terminal on the condensing unit and the Y terminal on the thermostat

The condenser fan motor on most residential air conditioning systems is controlled by the __________________.

• Blower relay

• Contactor

• Fan sequencer

• Control relay

The contactor coil on a residential condensing unit will be energized during the ______________ mode(s) of operation.

• Cooling

• Heating

• Heating and cooling

• Defrost