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Refrigeration & HVAC MCQ Marathon

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Refrigeration & HVAC MCQ Marathon

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HVAC tech MCQs for practice

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1 MeanIt
1 MeanIt
Philippines

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Refrigeration & HVAC MCQ Marathon
 

Refrigeration & HVAC MCQ MarathonOnline version

HVAC tech MCQs for practice

by 1 MeanIt
1

What is the form of energy that flows from a higher-temperature body to a lower-temperature body?

2

Which part of a refrigeration system compresses the refrigerant?

3

Which refrigerant is considered least harmful to the environment among the choices?

4

What is the approximate value of atmospheric pressure under the conventional metric system?

5

What should be done with the refrigerant before performing a repair on a refrigeration system?

6

If the compressor is sweating badly, what could be the possible trouble?

7

Which statement best describes how refrigerant moves through a refrigeration system?

8

Specialized clothing or equipment used for worker safety is called:

9

A technician lifts a 50-kg motor compressor using his back instead of his legs. What type of hazard is involved?

10

Which statement is correct regarding the proper handling of refrigerant cylinders?

11

Which among the following are biological hazards?

12

What does MSDS stand for?

13

What is the condition of refrigerant from Point 3–4 in the basic refrigeration cycle?

14

What type of gas should be passed through the pipe while brazing refrigeration tubing?

15

What is the purpose of using nitrogen while brazing refrigeration tubing?

16

A clogged filter drier can cause compressor short cycling due to the activation of the:

17

The green wire from the motor should be connected to the:

18

When troubleshooting an electronic circuit board, what should the technician check first?

19

Which statement about motor protection devices is true?

20

What does high superheat generally indicate?

21

Which type of compressor uses pistons to compress refrigerant gas?

22

Where is the bulb of a thermostatic expansion valve (TXV) normally mounted?

23

Jorix and Kriz are discussing the proper procedure before repairing a refrigeration system. Jorix suggests releasing the refrigerant directly into the atmosphere, while Kriz recommends recovering the refrigerant using a recovery machine. Who is correct?

24

Which component moves refrigerant vapor toward the condenser after compression?

25

What is the primary function of the evaporator in a refrigeration cycle?

26

Which statement best describes how refrigerant moves through a refrigeration system?

27

What is the main purpose of the expansion device in a refrigeration cycle?

28

Which of the following is an example of a safety precaution in refrigeration work?

29

Which of the following best describes the direction of heat flow in a condenser?

30

Which unit is used to measure atmospheric pressure in the document’s context?

31

What is the correct action for a technician to take with a refrigerant before repairs?

32

Which statement correctly describes a basic refrigeration cycle step?

33

Which item is NOT a common refrigerant safety acronym in the document?

34

What does this symbol represent in refrigeration and air-conditioning systems?

35

What does this symbol represent in refrigeration and air-conditioning systems?

36

What does this symbol represent in refrigeration and air-conditioning systems?

37

Which of the following symbols represents a FLAMMABLE hazard?

38

Which of the following symbols represents a SERIOUS HEALTH hazard?

39

Which of the following symbols represents a TOXIC hazard?

40

What hazard does this symbol represent?

41

What hazard does this symbol represent?

Choose one or more answers

42

What hazard does this symbol represent?

43

What hazard does this symbol represent?

44

What electrical symbol does this picture represent?

45

What electrical symbol does this picture represent?

Feedback

Heat naturally moves from hot to cold bodies in thermodynamics.

The compressor raises the refrigerant’s pressure and temperature.

R-600a is a hydrocarbon with lower environmental impact compared to common HFCs.

Atmospheric pressure is about 1.033 kgf/cm² at sea level.

Refrigerants must be recovered to prevent environmental harm.

Excess refrigerant can cause high pressure and sweating.

Cycle: evaporator (absorb heat) → compressor (compress) → condenser (release heat).

Safety gear is collectively PPE.

Improper lifting risks musculoskeletal injury.

Proper handling includes avoiding heat, proper storage, and safety precautions.

Biological hazards include microbes.

MSDS is the safety data sheet for chemicals.

In basic cycle, after condenser, refrigerant is high-pressure liquid.

Nitrogen prevents oxidation during brazing.

Inert nitrogen protects joints from oxidation.

Low-pressure switch can trip if drying impairs flow.

Green is typically the safety earth ground.

Power is the first check in troubleshooting.

Protection scales with motor size and risk.

High superheat often means insufficient evaporator heat transfer.

Reciprocating compressors use pistons.

TXV sensing bulb is typically on the evaporator outlet side.

The condenser rejects heat and condenses vapor to liquid.

Evaporator absorbs heat, causing refrigerant to vaporize.

Cycle: evaporator → compressor → condenser → expansion.

Expansion device drops pressure to enable evaporation.

Safety procedures protect technicians and environments.

Condenser rejects heat to the environment.

The document uses kgf/cm² for pressure values.

Proper recovery prevents environmental harm.

During evaporation, refrigerant absorbs heat and vaporizes.

 
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