Module 1 – Multiple Choice Questions – platform.re-energize.eu

1. What is the primary function of a heat pump?

To generate heat by combustion

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To transfer heat from a low-temperature source to a high-temperature sink

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To convert electrical energy directly into heat

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To store thermal energy

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2. Which component in a heat pump cycle is responsible for increasing refrigerant pressure and temperature?

Evaporator

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Condenser

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Compressor

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Expansion valve

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What happens to the refrigerant in the evaporator?

It condenses and releases heat

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It evaporates and absorbs heat

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It increases pressure

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It becomes subcooled liquid

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What is the main difference between a heat pump and a conventional boiler?

A heat pump uses combustion, while a boiler uses electricity

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A boiler transfers heat, while a heat pump generates heat

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A heat pump transfers heat, while a boiler generates heat

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There is no difference in operation

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What does the Coefficient of Performance (COP) represent in heating mode?

The ratio of heat output to electrical input

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The ratio of electrical input to heat losses

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The ratio of source temperature to sink temperature

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The ratio of pressure to temperature

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How does increasing the temperature lift affect heat pump performance?

It increases COP

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It has no effect

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It decreases COP

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It eliminates irreversibilities

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What does the Carnot cycle represent for heat pumps?

The minimum achievable efficiency

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The real operating condition

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The maximum theoretical efficiency

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The compressor efficiency

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What is a major source of irreversibility in real heat pump systems?

Constant temperature evaporation

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Isentropic compression

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Friction and heat transfer across temperature differences

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Zero pressure drop

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What is the primary role of a refrigerant in a heat pump system?

To store electrical energy

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To transfer heat through phase change

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To increase system pressure permanently

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To reduce system temperature only

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What does the ASHRAE safety classification of refrigerants indicate?

Compressor type and efficiency

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Pressure and temperature limits

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Toxicity and flammability

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Refrigerant color and odor

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Why is there a transition toward low-GWP refrigerants?

To increase compressor size

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To reduce environmental impact

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To eliminate heat exchangers

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To simplify installation

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Which type of compressor is commonly used for quiet and efficient operation in small
heat pumps?

Reciprocating compressor

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Scroll compressor

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Screw compressor

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Centrifugal compressor

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What is the function of the condenser in a heat pump?

To absorb heat from the source

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To reduce refrigerant pressure

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To release heat to the sink

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To increase refrigerant velocity

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What is a key advantage of water-cooled condensers compared to air-cooled ones?

Lower heat transfer performance

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Higher heat transfer efficiency

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No need for pumps

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Lower installation complexity

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What is the main purpose of an expansion device?

To increase refrigerant pressure

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To reduce refrigerant pressure and control flow

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To store refrigerant

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To compress refrigerant vapor

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What is the main function of a thermostatic expansion valve (TXV)?

To control compressor speed

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To regulate refrigerant flow based on superheat

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To increase condenser pressure

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To measure refrigerant charge

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What is the role of a four-way reversing valve in a heat pump?

To control refrigerant pressure

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To reverse the direction of heat flow between heating and cooling modes

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To filter refrigerant

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To store refrigerant

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What is the purpose of a filter-drier in the refrigeration circuit?

To increase refrigerant temperature

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To remove moisture and contaminants

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To regulate pressure

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To store excess refrigerant

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What is the function of a circulation pump in a heat pump system?

To compress refrigerant

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To circulate water or brine in the distribution system

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To control refrigerant phase change

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To regulate expansion

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What is the main purpose of a buffer tank in a heat pump system?

To increase refrigerant pressure

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To store electrical energy

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To prevent compressor short cycling

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To replace the expansion valve

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Module 1 – Multiple Choice Questions

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