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Evaporators and Condensers, Objective 3

Authored by Andgel Thomas

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Professional Development

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Evaporators and Condensers, Objective 3
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15 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What occurs when an evaporator operates below the dew point and below the freezing point of the evaporator air entering temperature?

Moisture is precipitated out of the air.

The refrigeration cycle starts.

The compressor shuts down.

The evaporator fan stops.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which defrost method is the most economical and does not require additional components like timers or solenoids?

Off-cycle defrost

Electric defrost

Manual defrost

Hot-gas defrost

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the primary fault that causes excessive run time in off-cycle defrost systems?

Low refrigerated space heat load

High ambient humidity

Fouled condenser

Short-cycled condenser air flow

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which defrost method uses resistance heaters embedded in the evaporator fins?

Manual defrost

Hot-gas defrost

Electric defrost

Reverse cycle defrost

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does the hot-gas defrost method use to defrost the evaporator?

Superheated refrigerant vapour

Warm air

Brine spray

Water spray

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does the evaporator fan do during the defrost cycle in a hot-gas defrost system?

Reverses direction

Runs at a lower speed

Shuts off

Runs at maximum speed

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the purpose of a re-evaporator coil in a hot-gas defrost system?

To increase the pressure

To cool down the evaporator

To heat the refrigerant

To evaporate condensed liquid

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