Free Practice Quiz Question List

2 Refrigeration Systems and Components Online Quiz Questions

Use this free practice quiz with 20 questions to review 2 Refrigeration Systems and Components, test your knowledge, and prepare for your next test or exam.

20 questions

True or false

1 point

True or false: A capillary tube automatically changes its opening to adjust refrigerant flow when operating conditions change.

A
True
B
False

Choose one

1 point

A refrigerator’s evaporator operates at lower pressure than the condenser. What does the lower pressure allow the refrigerant to do in the evaporator?

A
It raises the refrigerant’s boiling temperature.
B
It allows refrigerant to boil at a lower temperature.
C
It turns all refrigerant into high-pressure liquid.
D
It stops refrigerant from absorbing heat.

Written response

1 point

At the evaporator outlet, what phase of refrigerant returns toward the compressor?

Choose one

1 point

When refrigerant leaves the compressor in a vapor-compression refrigerator, which state should you expect?

A
Low-pressure, cold liquid
B
Low-pressure vapor
C
High-pressure, hot vapor
D
High-pressure liquid

Choose all

1 point

Which statements accurately describe appliance controls or protection? Select all that apply.

A
A thermostat or temperature sensor can call for cooling when needed.
B
A defrost control raises the refrigerant pressure to condense it.
C
A defrost control can periodically manage a defrost cycle.
D
Electrical overload protection helps protect the compressor motor from excessive current or temperature.
E
Electrical overload protection adjusts the refrigerant feed to maintain superheat.

Written response

1 point

What component varies refrigerant flow to help maintain appropriate superheat at the evaporator outlet?

True or false

1 point

The evaporator cools an appliance by absorbing heat from its interior, rather than by creating cold.

A
True
B
False

Choose all

1 point

As refrigerant passes through a metering device, which changes or effects are expected? Select all that apply.

A
It restricts refrigerant flow from the high-pressure side to the low-pressure side.
B
The pressure drop causes some liquid refrigerant to flash into vapor.
C
It compresses the refrigerant into hot, high-pressure vapor.
D
A cold liquid-vapor mixture leaves it and enters the evaporator.
E
It releases heat to the surroundings as refrigerant condenses.

Choose one

1 point

A refrigerator reaches its thermostat’s target temperature. What does the control typically do next?

A
The control keeps the compressor running continuously.
B
The control typically stops the compressor.
C
The metering device opens fully and remains open.
D
The condenser begins absorbing heat from the refrigerator interior.

Open ended

1 point

Explain how pressure changes in a vapor-compression system allow refrigerant to absorb heat from a refrigerator’s interior and release heat to the warmer room. Refer to the evaporator, compressor, condenser, and metering device.

Choose one

1 point

A refrigerator cools its interior using an evaporator. Which statement about air movement across the evaporator is accurate?

A
Air must always be moved across the evaporator by a fan.
B
Fans may move air across the evaporator, or air may circulate naturally.
C
The evaporator blocks air movement to prevent heat transfer.
D
Only water can carry heat away from the evaporator.

True or false

1 point

The evaporator creates cold inside the appliance and the refrigerant carries that cold away.

A
True
B
False

Choose one

1 point

Why is the refrigerant at low pressure as it enters the evaporator?

A
It raises the refrigerant's boiling temperature so it releases heat inside the appliance.
B
It allows the refrigerant to boil at a lower temperature and absorb heat from the appliance interior.
C
It turns the refrigerant into a high-pressure liquid before it enters the appliance.
D
It prevents the refrigerant from changing phase inside the evaporator.

Choose one

1 point

A technician checks the refrigerant immediately after it leaves the compressor. Which state should the technician expect?

A
Low-pressure liquid
B
High-pressure liquid
C
High-pressure, hot vapor
D
Low-pressure, cold liquid-vapor mixture

Written response

1 point

What protection helps guard the compressor motor against excessive current or temperature?

Choose one

1 point

A household refrigerator's condenser feels warm while the system is running. Which explanation best accounts for this?

A
It releases heat absorbed in the evaporator and energy added by the compressor.
B
It absorbs heat from the surroundings and adds it to the refrigerant.
C
It removes compressor energy from the system without transferring heat.
D
It cools the refrigerant by lowering its pressure before it reaches the evaporator.

Written response

1 point

What condition at the evaporator outlet does a thermostatic expansion valve help maintain by varying refrigerant flow?

Choose one

1 point

The refrigerated space reaches its set temperature. What does the temperature control typically do?

A
The condenser fan stops permanently.
B
The metering device changes into a compressor.
C
The refrigerant stops circulating because it has all become liquid.
D
The control typically stops the compressor.

Fill in the blank

1 point

A technician traces the refrigerant line returning from an evaporator to the component that draws in the vapor and drives circulation through the system. That component is the .

Fill in the blank

1 point

A refrigerator has no coil mounted at the back, but its design includes a heat exchanger built into the cabinet walls. The component installed this way is the .

2 Refrigeration Systems and Components Online Quiz Questions

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