Neil Revollo
Quiz by , created more than 1 year ago

Unit 62 - Heat Pump System Fundamentals

590
0
0
Neil Revollo
Created by Neil Revollo over 8 years ago
Close

Unit 62 - Exam

Question 1 of 22

1

How does the heating-cycle charge compensator aid the heating cycle?

Select one of the following:

  • It makes the gas line cold.

  • It raises the temperature of the refrigerant.

  • It stores the unneeded refrigerant.

  • It fills with hot air.

Explanation

Question 2 of 22

1

How is the COP rating different from the HSPF?

Select one of the following:

  • HSPF takes data from multiple weather conditions.

  • Only the HSPF measures heating and cooling units.

  • Only the COP measures defrost.

  • COP takes data from multiple weather conditions.

Explanation

Question 3 of 22

1

Because air source heat pumps circulate less refrigerant at low ambient temperatures, the refrigerant not being used is stored

Select one of the following:

  • In a liquid receiver

  • In the compressor crankcase

  • In a suction accumulator or charge compensator

  • In the metering device

Explanation

Question 4 of 22

1

How is heat pump Coefficient of Performance, COP, calculated?

Select one of the following:

  • COP is the ratio of heat output divided by heat input measured at one particular condition

  • COP is a measure of heating BTUs per watt averaged for the entire heating season

  • COP is a measure of heating BTUs per watt measured at one particular condition

  • COP is the ratio of heat output divided by heat input averaged for the entire heating season

Explanation

Question 5 of 22

1

How is heat pump Heating Seasonal Performance Factor, HSPF, calculated?

Select one of the following:

  • HSPF is the ratio of heat output divided by heat input measured at one particular condition.

  • HSPF is a measure of heating BTUs per watt measured at one particular condition

  • HSPF is the ratio of heat output divided by heat input averaged for the entire heating season

  • HSPF is a measure of heating BTUs per watt averaged for the entire heating season

Explanation

Question 6 of 22

1

What prevents the refrigerant from flowing through the indoor metering device during the heating cycle?

Select one of the following:

  • The outdoor check valve

  • The heating shutoff valve

  • The indoor check valve

  • The reversing valve

Explanation

Question 7 of 22

1

Heat pump A has a SEER rating of 16 and an HSPF rating of 7. Heat pump B has a SEER rating of 14 and an HSPF rating of 9. Which heat pump cools more efficiently?

Select one of the following:

  • Heat pump A

  • Heat pump B

  • They are about the same heating efficiency by the time both the SEER and HSPF are considered

  • Neither the SEER nor the HSPF can determine which heat pump heats more efficiently

Explanation

Question 8 of 22

1

What is the main difference between a heat pump and a fossil fuel furnace?

Select one of the following:

  • Fossil fuel furnaces have been around longer.

  • Fossil fuel furnaces are hotter.

  • Heat pumps are easier to install.

  • Heat pumps move heat instead of creating it.

Explanation

Question 9 of 22

1

How can an air source heat pump heat when the outdoor temperature is cold?

Select one of the following:

  • The friction of the air passing over the outdoor coil raises the temperature

  • All molecules contain some heat until they reach absolute 0 (-460ºF)

  • Air source heat pumps only use the outdoor air in the cooling season

  • All heating is accomplished with electrical resistance heaters, so the air temperature is irrelevant

Explanation

Question 10 of 22

1

How can you lower the temperature at which evaporation takes place?

Select one of the following:

  • Reduce the pressure on the low side of the system

  • Raise the pressure on the low side of the pump

  • Decrease the pressure on the high side of the pump

  • Add more refrigerant into the pump

Explanation

Question 11 of 22

1

Which of the following is the correct order of the flow in the heating cycle of an air source heat pump?

Select one of the following:

  • compressor, reversing valve, indoor coil, outdoor TEV, outdoor coil, reversing valve

  • reversing valve, indoor coil, outdoor coil, outdoor TEV, compressor

  • Indoor TEV, indoor coil, reversing valve, compressor, reversing valve, outdoor coil

  • compressor, reversing valve, outdoor coil, indoor TEV, indoor coil, reversing valve

Explanation

Question 12 of 22

1

When are most heat pump reversing valves energized?

Select one of the following:

  • During both the defrost and cooling cycles

  • During the cooling cycle

  • During the defrost cycle

  • During the heating cycle

Explanation

Question 13 of 22

1

What makes the main valve in the reversing valve shift from one side to the other?

Select one of the following:

  • A small gear motor that is operated on 24 volts engages gears on the back of the valve core

  • An electronic stepper motor mounted on one end of the reversing valve

  • Pressure difference from one side of the valve to the other

  • A solenoid coil creates a magnetic field that pulls the valve to one end and repels it to the other

Explanation

Question 14 of 22

1

Which of the following is responsible for shifting the position of the sliding cylinder?

Select one of the following:

  • condensation

  • pressure

  • refrigerant

  • gravity

Explanation

Question 15 of 22

1

The heat source for an air source heat pump is

Select one of the following:

  • the air inside the house

  • the air outside the house

  • the water in the water loop

  • electric strip heat

Explanation

Question 16 of 22

1

How are heat pumps classified?

Select one of the following:

  • by their cooling source and cooling sink

  • by their air intake pump

  • by their heat source and heat sink

  • by their refrigerant type

Explanation

Question 17 of 22

1

How can a heat pump filter drier be differentiated from a standard filter drier?

Select one of the following:

  • By the shiny, polished appearance of the stainless steel core

  • By the two copper lines on each end of the drier

  • By the 600 psig pressure rating

  • By the directional arrows pointing towards both ends of the drier

Explanation

Question 18 of 22

1

When is the outdoor metering device bypassed?

Select one of the following:

  • The cooling cycle

  • The heating cycle

  • Both the cooling and defrost cycles

  • Both the heating and defrost cycles

Explanation

Question 19 of 22

1

When is the indoor metering device bypassed?

Select one of the following:

  • The heating cycle

  • The cooling cycle

  • Both the cooling and defrost cycles

  • Both the heating and cooling cycles

Explanation

Question 20 of 22

1

A bi-flow thermostatic expansion valve

Select one of the following:

  • can be used with two different refrigerants by selecting the correct flow

  • can be used for creating two stages of heating or cooling

  • allows refrigerant flow in both directions

  • can be used with two different capacity units by selecting the correct flow

Explanation

Question 21 of 22

1

Liquid floodback commonly occurs on air source heat pumps

Select one of the following:

  • when the defrost cycle is terminated and the cycle reverses

  • when the heat pump is operated in cooling with a low charge

  • when the liquid filter drier is stopped up

  • when the heat pump is operated in heating on a warm day

Explanation

Question 22 of 22

1

Heat pump A has a SEER rating of 16 and an HSPF rating of 7. Heat pump B has a SEER rating of 14 and an HSPF rating of 9. Which heat pump heats more efficiently?

Select one of the following:

  • Heat pump A

  • Heat pump B

  • They are about the same heating efficiency by the time both the SEER and HSPF are considered

  • Neither the SEER nor the HSPF can determine which heat pump heats more efficiently

Explanation

Previous
Next