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Unit 62 - Exam

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Unit 62 - Heat Pump System Fundamentals
Neil Revollo
Quiz by Neil Revollo, updated more than 1 year ago
Neil Revollo
Created by Neil Revollo almost 9 years ago
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Question 1

Question
How does the heating-cycle charge compensator aid the heating cycle?
Answer
  • It makes the gas line cold.
  • It raises the temperature of the refrigerant.
  • It stores the unneeded refrigerant.
  • It fills with hot air.

Question 2

Question
How is the COP rating different from the HSPF?
Answer
  • 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.

Question 3

Question
Because air source heat pumps circulate less refrigerant at low ambient temperatures, the refrigerant not being used is stored
Answer
  • In a liquid receiver
  • In the compressor crankcase
  • In a suction accumulator or charge compensator
  • In the metering device

Question 4

Question
How is heat pump Coefficient of Performance, COP, calculated?
Answer
  • 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

Question 5

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

Question 6

Question
What prevents the refrigerant from flowing through the indoor metering device during the heating cycle?
Answer
  • The outdoor check valve
  • The heating shutoff valve
  • The indoor check valve
  • The reversing valve

Question 7

Question
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?
Answer
  • 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

Question 8

Question
What is the main difference between a heat pump and a fossil fuel furnace?
Answer
  • 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.

Question 9

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

Question 10

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

Question 11

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

Question 12

Question
When are most heat pump reversing valves energized?
Answer
  • During both the defrost and cooling cycles
  • During the cooling cycle
  • During the defrost cycle
  • During the heating cycle

Question 13

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

Question 14

Question
Which of the following is responsible for shifting the position of the sliding cylinder?
Answer
  • condensation
  • pressure
  • refrigerant
  • gravity

Question 15

Question
The heat source for an air source heat pump is
Answer
  • the air inside the house
  • the air outside the house
  • the water in the water loop
  • electric strip heat

Question 16

Question
How are heat pumps classified?
Answer
  • by their cooling source and cooling sink
  • by their air intake pump
  • by their heat source and heat sink
  • by their refrigerant type

Question 17

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

Question 18

Question
When is the outdoor metering device bypassed?
Answer
  • The cooling cycle
  • The heating cycle
  • Both the cooling and defrost cycles
  • Both the heating and defrost cycles

Question 19

Question
When is the indoor metering device bypassed?
Answer
  • The heating cycle
  • The cooling cycle
  • Both the cooling and defrost cycles
  • Both the heating and cooling cycles

Question 20

Question
A bi-flow thermostatic expansion valve
Answer
  • 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

Question 21

Question
Liquid floodback commonly occurs on air source heat pumps
Answer
  • 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

Question 22

Question
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?
Answer
  • 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
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