Question 1

If an air conditioning system must be pressurized of service work it can be safely done with:

Accepted Answer

A)   Oxygen
B)   Nitrogen
C)   Polyalkylene
D)   Acetylene B

Question 2

During a gauge test of the air conditioning system you find both the suction pressure and the discharge pressure to be low. Which of the following could be the cause?

Accepted Answer

A)   Refrigerant pressure low
B)   Refrigerant pressure very low
C)   Expansion valve or orifice tube blockage
D)   Any of the above could be the cause D

Question 3

During a performance test of an air conditioning system the discharge line from the compressor should be:

Accepted Answer

A)   Cool to the touch
B)   Cold to the touch
C)   Warm to the touch
D)   Hot to the touch D

Question 4

Before opening any part of the air conditioning system refrigerant must:

Accepted Answer

A)   Be evacuated
B)   Be allowed to cool down to relieve system pressure
C)   Be vented to the atmosphere
D)   Recovered

Question 5

Identify the incorrect statement in regards to PAG (polyalkylene glycol) oil:

Accepted Answer

A)   PAG oil is hygroscopic.
B)   PAG oil is easily mixed with any other refrigerant oil.
C)   PAG oil can easily damage paint surfaces.
D)   PAG oil should be kept in a clean container to prevent contamination.

Question 6

During a gauge test of an air condition system your fine the suction pressure high and the discharge pressure low to normal. Which of the following could produce these gauge readings?

Accepted Answer

A)   Defective thermostatic switch
B)   Expansion valve held open
C)   Expansion valve not opening enough
D)   Refrigerant charge low

Question 7

What cleaning method would be used for an air conditioning system that is extremely contaminated?

Accepted Answer

A)   Purging
B)   Flushing
C)   Evacuating
D)   Ejecting

Question 8

When performance testing and air conditioning system the engine should be run at:

Accepted Answer

A)   800 RPM's
B)   1,000 RPM's
C)   1,200 RPM's
D)   1,500 RPM's

Question 9

During a performance test of an air conditioning system the liquid line from the condenser to the receiver-drier should be?

Accepted Answer

A)   Cool to the touch
B)   Cold to the touch
C)   Warm to the touch
D)   Hot to the touch

Question 10

Any time an air conditioning system is opened it must have the __________ replaced before evacuating the system.

Accepted Answer

A)   Orifice tube
B)   Thermostatic expansion valve
C)   Receiver drier
D)   Compressor oil

Question 11

You are gauge testing an air condition system and the pressures are normal but the driver complains that is not cooling effectively. What could cause this type of complaint?

Accepted Answer

A)   Some air and moisture in the system
B)   Low refrigerant charge
C)   Slipping compressor belt
D)   Frozen expansion valve

Question 12

During a performance test of an air conditioning system how long should you let the unit run and stabilize before taking a vent temperature reading?

Accepted Answer

A)   2 to 3 minutes
B)   3 to 4 minutes
C)   5 to 10 minutes
D)   15 to 20 minutes

Question 13

During a performance test of an air conditioning system the suction line from the evaporator outlet to the compressor inlet should be:

Accepted Answer

A)   Cool to the touch
B)   Cold to the touch
C)   Warm to the touch
D)   Hot to the touch

Question 14

During a gauge test of the air conditioning system you find both the suction and discharge pressure to be high. What could be the possible cause?

Accepted Answer

A)   Some air and moisture in the system
B)   Excessive air and moisture in the system
C)   Restriction in the high pressure side
D)   Refrigerant charge very low

Question 15

What kind of pressures would you suspect would be the result of a defective compressor?

Accepted Answer

A)   High suction pressure
B)   Low suction pressure
C)   High discharge pressure
D)   Normal discharge pressure

Exam 10: Trouble Shooting

If an air conditioning system must be pressurized of service work it can be safely done with:

During a gauge test of the air conditioning system you find both the suction pressure and the discharge pressure to be low. Which of the following could be the cause?

During a performance test of an air conditioning system the discharge line from the compressor should be:

Before opening any part of the air conditioning system refrigerant must:

Identify the incorrect statement in regards to PAG (polyalkylene glycol) oil:

During a gauge test of an air condition system your fine the suction pressure high and the discharge pressure low to normal. Which of the following could produce these gauge readings?

What cleaning method would be used for an air conditioning system that is extremely contaminated?

When performance testing and air conditioning system the engine should be run at:

During a performance test of an air conditioning system the liquid line from the condenser to the receiver-drier should be?

Any time an air conditioning system is opened it must have the __________ replaced before evacuating the system.

You are gauge testing an air condition system and the pressures are normal but the driver complains that is not cooling effectively. What could cause this type of complaint?

During a performance test of an air conditioning system how long should you let the unit run and stabilize before taking a vent temperature reading?

During a performance test of an air conditioning system the suction line from the evaporator outlet to the compressor inlet should be:

During a gauge test of the air conditioning system you find both the suction and discharge pressure to be high. What could be the possible cause?

What kind of pressures would you suspect would be the result of a defective compressor?