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1 High- and Very-High-Pressure Refrigeration Systems Online Quiz Questions

Use this free practice quiz with 20 questions to review 1 High- and Very-High-Pressure Refrigeration Systems, test your knowledge, and prepare for your next test or exam.

20 questions
01
Choose one
1 point

In a vapor-compression refrigeration system, what does the expansion device do?

  1. A

    Rejects heat so refrigerant vapor condenses into liquid

  2. B

    Meters refrigerant and reduces its pressure before the evaporator

  3. C

    Raises the pressure and temperature of low-pressure vapor

  4. D

    Absorbs heat as refrigerant evaporates at lower pressure

02
Fill in the blank
1 point

A compressor draws in low-pressure vapor and raises its .

03
Written response
1 point

The EPA pressure thresholds are stated in psia. What type of pressure does psia measure?

04
Choose one
1 point

Under the EPA categories described, how is an appliance using R-410A classified?

  1. A

    Medium pressure

  2. B

    Low pressure

  3. C

    High pressure

  4. D

    Very high pressure

05
Written response
1 point

At what temperature is refrigerant liquid-phase saturation pressure evaluated for the EPA pressure categories? Enter the value in °F.

06
Choose one
1 point

Carbon dioxide (R-744) has a critical temperature below 104°F. Which EPA pressure category does that criterion place it in?

  1. A

    Very high pressure

  2. B

    High pressure

  3. C

    Medium pressure

  4. D

    The category cannot be determined from the stated criterion

07
Choose all
1 point

Which are pressure-related hazards described for refrigeration systems? Select all that apply.

  1. A

    A vessel or fitting can fail and release refrigerant violently

  2. B

    A pressurized leak can inject refrigerant through skin or eyes

  3. C

    A pressure category alone proves that a refrigerant is flammable

  4. D

    Expanding refrigerant can cause cold burns or frostbite

  5. E

    Escaping refrigerant can displace oxygen and cause asphyxiation

08
Choose all
1 point

Which four components are essential to a typical vapor-compression system? Select all that apply.

  1. A

    Compressor

  2. B

    Condenser

  3. C

    Expansion device

  4. D

    Evaporator

  5. E

    Oil separator

  6. F

    Receiver

09
True or false
1 point

True or false: A single operating-pressure reading is enough to determine an appliance’s EPA pressure category.

  1. A

    True

  2. B

    False

10
True or false
1 point

True or false: Knowing a refrigerant’s EPA pressure category tells you whether it is toxic or flammable.

  1. A

    True

  2. B

    False

11
Fill in the blank
1 point

Liquid refrigerant trapped between closed valves can expand as it warms, causing the in the isolated section to rise.

12
Open ended
1 point

Explain the EPA criteria for classifying refrigerants as high pressure versus very high pressure. Include the reference condition and explain why these categories should not be treated as fixed operating pressures.

13
Choose one
1 point

Two refrigeration systems are at the same temperature but use different refrigerants. Which conclusion about their pressures is supported?

  1. A

    Different refrigerants can have substantially different pressures at the same temperature

  2. B

    All refrigerants have the same pressure at the same temperature

  3. C

    Pressure is determined only by the appliance’s application

  4. D

    Pressure is determined only by compressor type

14
Choose one
1 point

During a vapor-compression cycle, which function is performed by the condenser?

  1. A

    It absorbs heat as refrigerant evaporates at lower pressure.

  2. B

    It rejects heat so refrigerant vapor condenses into liquid.

  3. C

    It draws in low-pressure vapor and raises its pressure and temperature.

  4. D

    It meters refrigerant and reduces its pressure before the evaporator.

15
True or false
1 point

A refrigerant's pressure category, by itself, establishes whether that refrigerant is toxic or flammable.

  1. A

    True

  2. B

    False

16
Written response
1 point

Which vapor-compression component meters refrigerant and reduces its pressure before the refrigerant enters the evaporator?

17
Choose one
1 point

Under the EPA pressure categories described in the material, how is R-134a classified?

  1. A

    Low pressure

  2. B

    High pressure

  3. C

    Medium pressure

  4. D

    Very high pressure

18
Choose one
1 point

Which measurement basis is used to determine whether a refrigerant meets the EPA high-pressure criterion?

  1. A

    Liquid-phase saturation pressure at 104°F (40°C), expressed in psia

  2. B

    The appliance's operating pressure at any temperature, expressed in psig

  3. C

    The compressor's discharge pressure at startup, regardless of refrigerant

  4. D

    The refrigerant's boiling temperature at the evaporator

19
Written response
1 point

What pressure-related hazard can occur when liquid refrigerant is isolated between closed valves and then warms?

20
Choose one
1 point

Why does carbon dioxide (R-744) meet the very-high-pressure criterion described in the material?

  1. A

    Its saturation pressure is always below 170 psia at 104°F.

  2. B

    Its critical temperature is below 104°F.

  3. C

    It is classified as very high pressure because it is flammable.

  4. D

    Its pressure category is determined by appliance size.