When a single metering device is used on a package heat pump system,

A$.$ the capillary tube is the most popular choice.

B$.$ it must be able to adjust refrigerant flow for the heating and cooling modes.

C$.$ it must be configured to meet the flow requirements for the heating mode.

D$.$ it must be configured to meet the flow requirements for the cooling mode.

Which of the following is true regarding package$-$type heat pump systems?

A$.$ All field$-$installed refrigerant lines must be insulated.

B$.$ They are charged at the factory and bench$-$tested before they are shipped.

C$.$ They are shipped with a holding charge of dry nitrogen.

D$.$ Only the larger of the two field$-$installed refrigerant lines must be insulated.

How can a system be easily identified as a heat pump by simply looking at the thermostat?

A$.$ Heat pump thermostats have both heating and cooling settings.

B$.$ Heat pump thermostats have a FAN$-$ON$,$ FAN$-$AUTO feature.

C$.$ Heat pump thermostats have an emergency heat setting.

D$.$ Heat pump thermostats have an automatic changeover feature.

Which of the following statements is true regarding the cooling cycle of a heat pump system?

A$.$ The compressor cycles on when the thermete's selector switch is set to the cooling mode and $r_{s\text{p}\text{r}\text{e}\text{v}\text{e}\text{r}\text{s}-}$ ing valve's coil energizes and deenergizes to sing on the space temperature.

B$.$ The coil on the reversing valve is energized thenen the thermostat's selector switch is set to the cooling mode and the compressor cycles on and off depending on the space temperature.

C$.$ Both the compressor and the reversing valve's coil are energized when the thermostat's selector switch is set to the cooling mode and the reversing valve's coil energizes and deenergizes depending on the space temperature.

D$.$ Neither the compressor nor the reversing valve's coil are energized when the thermostat's selector switch is set to the cooling mode, but they are both energized and deenergized depending on the space temperature.

Which of the following best describes the operation of second$-$stage heat on a heat pump system?

A$.$ First on$,$ first off

B$.$ First on$,$ last off

C$.$ Last on$,$ first off

D$.$ Last on$,$ last off