Question 1

What is R-134a chemically? It is referred to as what?

Accepted Answer

The answer of What is R-134a chemically? It is referred...

Question 2

What is the heart of the refrigerant system?

Accepted Answer

The refrigerant compressor is the heart ...

Question 3

When relative humidity is high,the air conditioner must work harder than when relative humidity is low.

Accepted Answer

A) True 
 B)False

Question 4

What state is the refrigerant in the condenser?

Accepted Answer

Refrigerant enters a...

Question 5

Where is the refrigerant system desiccant located?

Accepted Answer

Accumator/...

Question 6

Performance testing on air conditioning is being discussed.Technician A  says the engine should be operated at speeds over 3,000 rpm during the test.Technician B  says a fan should be used to force air through the condenser and radiator.Who is correct?

Accepted Answer

A)   Technician A only
B)   Technician B only
C)   Both A and B
D)   Neither A nor BE) A) and B)
F) All of the above

Question 7

Technician A   says the CFC-12 (R-12) service manifold hose fitting must be 1/2-inch male refrigerant flare nut at each end. Technician A says HFC-134a (R-134a) service manifold hoses use an ACME female nut.Who is correct?

Accepted Answer

A)   Technician A only
B)   Technician B only
C)   Both A and B
D)   Neither A nor BE) C) and D)
F) A) and D)

Question 8

A modern air conditioner system will have either an accumulator or a receiver-drier but not both.

Accepted Answer

A) True 
 B)False

Question 9

Under normal operating conditions all of the following occurs inside the evaporator,EXCEPT:

Accepted Answer

A)   The refrigerant removes heat from the outside air drawn across the evaporator core.
B)   The refrigerant changes from a vapor to a liquid.
C)   Heat entering the refrigerant causes it to change state.
D)   The refrigerant absorbs heat.E) B) and D)
F) All of the above

Question 10

Where in the system is the receiver dryer located?

Accepted Answer

A)   on the inlet to the condenser.
B)   on the outlet of the evaporator.
C)   on the outlet of the condenser.
D)   none of the above.E) C) and D)
F) B) and D) C

Question 11

Technician A  says the Schrader-type service valve is automatically opened when the service hose is installed.Technician B  says the Schrader-type service valve is automatically closed when the service hose is removed.Who is correct?

Accepted Answer

A)   Technician A only
B)   Technician B only
C)   Both A and B
D)   Neither A nor BE) A) and C)
F) A) and D) C

Question 12

Explain why high pressure must be maintained in the condenser.

Accepted Answer

High pressure is nec...

Question 13

The refrigerant entering the condenser is in the liquid state.

Accepted Answer

A) True 
 B)False

Question 14

What is the basic function of the automotive air conditioning system?

Accepted Answer

The basic function of the automotive air...

Question 15

All of the following statements about the hand valves in an air conditioning gauge manifold are true,EXCEPT:

Accepted Answer

A)   When both hand valves are closed, both the low- and high-side hose ports are connected only to the low- and high-side gauges.
B)   If either hand valve is cracked open and the center hose is opened, refrigerant pressure will equalize across the system.
C)   The gauges show respective system pressures when the manifold hand valves are closed.
D)   If both manifold hand valves are cracked, the pressures will equalize in the manifold and neither of the gauges will accurately indicate system pressure.E) A) and B)
F) A) and C)

Question 16

What does the term relative humidity mean?

Accepted Answer

Relative humidity is...

Question 17

What is the heart of the refrigerant system?

Accepted Answer

The refrigerant comp...

Question 18

What is one of the dividing points between the high and low sides of the refrigerant system?

Accepted Answer

The compressor and the expansi...

Question 19

Technician A  says there is a common passage on a manifold and gauge set.Technician B  says both hand valves on a manifold and gauge set must be closed to read service pressures.Who is correct?

Accepted Answer

A)   Technician A only
B)   Technician B only
C)   Both A and B
D)   Neither A nor BE) A) and B)
F) A) and C)

Question 20

Explain why low pressure must be maintained in the evaporator.

Accepted Answer

Low pressure is necessary to cause the refrigerant to vaporize and absorb heat.

Exam 4: Air-Conditioning System Operating Principlesthe Manifold and Gauge Set

What is R-134a chemically? It is referred to as what?

Correct AnswerverifiedShow Answer

What is the heart of the refrigerant system?

Correct AnswerverifiedThe refrigerant compressor is the heart ...View AnswerShow Answer

When relative humidity is high,the air conditioner must work harder than when relative humidity is low.

Correct AnswerverifiedShow Answer

What state is the refrigerant in the condenser?

Correct AnswerverifiedRefrigerant enters a...View AnswerShow Answer

Where is the refrigerant system desiccant located?

Correct AnswerverifiedAccumator/...View AnswerShow Answer

Performance testing on air conditioning is being discussed.Technician A says the engine should be operated at speeds over 3,000 rpm during the test.Technician B says a fan should be used to force air through the condenser and radiator.Who is correct?

Correct AnswerverifiedShow Answer

Technician A says the CFC-12 (R-12) service manifold hose fitting must be 1/2-inch male refrigerant flare nut at each end. Technician A says HFC-134a (R-134a) service manifold hoses use an ACME female nut.Who is correct?

Correct AnswerverifiedShow Answer

A modern air conditioner system will have either an accumulator or a receiver-drier but not both.

Correct AnswerverifiedShow Answer

Under normal operating conditions all of the following occurs inside the evaporator,EXCEPT:

Correct AnswerverifiedShow Answer

Where in the system is the receiver dryer located?

Correct AnswerverifiedC

Technician A says the Schrader-type service valve is automatically opened when the service hose is installed.Technician B says the Schrader-type service valve is automatically closed when the service hose is removed.Who is correct?

Correct AnswerverifiedC

Explain why high pressure must be maintained in the condenser.

Correct AnswerverifiedHigh pressure is nec...View AnswerShow Answer

The refrigerant entering the condenser is in the liquid state.

Correct AnswerverifiedShow Answer

What is the basic function of the automotive air conditioning system?

Correct AnswerverifiedThe basic function of the automotive air...View AnswerShow Answer

All of the following statements about the hand valves in an air conditioning gauge manifold are true,EXCEPT:

Correct AnswerverifiedShow Answer

What does the term relative humidity mean?

Correct AnswerverifiedRelative humidity is...View AnswerShow Answer

What is the heart of the refrigerant system?

Correct AnswerverifiedThe refrigerant comp...View AnswerShow Answer

What is one of the dividing points between the high and low sides of the refrigerant system?

Correct AnswerverifiedThe compressor and the expansi...View AnswerShow Answer

Technician A says there is a common passage on a manifold and gauge set.Technician B says both hand valves on a manifold and gauge set must be closed to read service pressures.Who is correct?

Correct AnswerverifiedShow Answer

Explain why low pressure must be maintained in the evaporator.

Correct AnswerverifiedLow pressure is necessary to cause the refrigerant to vaporize and absorb heat.

Correct Answer
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The refrigerant compressor is the heart ...
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Correct Answer
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Correct Answer
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Refrigerant enters a...
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Accumator/...
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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C

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C

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High pressure is nec...
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Correct Answer
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The basic function of the automotive air...
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Correct Answer
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Correct Answer
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Relative humidity is...
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Correct Answer
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The refrigerant comp...
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Correct Answer
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The compressor and the expansi...
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Correct Answer
verified

Correct Answer
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Low pressure is necessary to cause the refrigerant to vaporize and absorb heat.