Question 1

Which of the following oils can be used in an R-134a system?

Accepted Answer

A) mineral oil 
B) tung oil 
C) castor oil 
D) PAG oil

Question 2

The change from a liquid to a vapor is called ____________________.

Accepted Answer

The answer of The change from a liquid to a...

Question 3

Technician A says European and Japanese manufacturers shipping vehicles to the US will eliminate R-134a A/C systems by 2017. Technician B says the United States will switch to R-22 in 2015. Who is correct?

Accepted Answer

A) A only 
B) B only 
C) both A and B 
D) neither A nor B

Question 4

The customer has reported that little heat comes out of the floor duct. Technician A says the coolant level in the engine's cooling system may be low. Technician B says the engine's thermostat may be faulty. Who is correct ?

Accepted Answer

A) A only 
B) B only 
C) both A and B 
D) neither A nor B

Question 5

A malfunctioning engine thermostat can be the cause of poor heater performance.

Accepted Answer

A) True 
 B)False

Question 6

The blower motor does not run in any fan switch position. A check with a DMM reveals that power is getting to the motor. Technician A says the motor ground is bad. Technician B says the motor is burned out. Who is correct?

Accepted Answer

A) A only 
B) B only 
C) both A and B 
D) neither A nor B

Question 7

Which statement is true?

Accepted Answer

A) Refrigerant leaves the compressor as a high-pressure, high-temperature liquid 
B) Refrigerant leaves the condenser as a low-pressure, high-temperature liquid 
C) Refrigerant returns to the compressor as a low-pressure, high-temperature vapor 
D) None of the answers is correct.

Question 8

What tool would you use to check the operation of a vacuum motor?

Accepted Answer

The answer of What tool would you use to check...

Question 9

Technician A says the receiver/drier is located on the low [pressure] side of the A/C system. Technician B says the accumulator is located on the low side of the system. Who is correct?

Accepted Answer

A) A only 
B) B only 
C) both A and B 
D) neither A nor B

Question 10

An A/C system cools the air by moving heat from the confined space of the passenger compartment to the engine cooling system.

Accepted Answer

A) True 
 B)False

Question 11

If little or no resistance is felt while operating the temperature control lever, the problem is most likely which of the following?

Accepted Answer

A) There is a vacuum leak between the intake manifold and control valve 
B) The control cables have slipped loose from the dash control or door arm 
C) The electric servomotor is burnt out 
D) The heat control valve is seized

Question 12

Technician A says R-12 air-conditioning technicians must be certified. Technician B says R-12 air-conditioning equipment must be certified. Who is correct?

Accepted Answer

A) A only 
B) B only 
C) both A and B 
D) neither A nor B

Question 13

When the air-conditioning is set to the maximum position, passenger compartment air is ____________________.

Accepted Answer

The answer of When the air-conditioning is set to the...

Question 14

Describe the function of a cycling clutch in an air-conditioning system.

Accepted Answer

The answer of Describe the function of a cycling clutch...

Question 15

PAG oil works well with R-12 refrigerant.

Accepted Answer

A) True 
 B)False

Question 16

Heater control valves are operated by a ______.

Accepted Answer

A) cable 
B) thermostat 
C) vacuum motor 
D) All the answers are correct.

Question 17

Aluminum tubing is often used to connect air-conditioning components where flexibility is not required.

Accepted Answer

A) True 
 B)False

Question 18

What type of vehicle uses heater cores with electric PTC heater strips?

Accepted Answer

A) pickup trucks and SUVs 
B) economy cars 
C) hybrids 
D) luxury cars

Question 19

The ____________________ displacement compressor automatically changes volume and the amount of refrigerant flow.

Accepted Answer

The answer of The ____________________ displacement compressor automatically changes volume...

Question 20

In an automotive A/C system the substance used to move heat from the passenger compartment to the outside air is called the ____________________.

Accepted Answer

The answer of In an automotive A/C system the substance...

Exam 54: Heating and Air Conditioning

Which of the following oils can be used in an R-134a system?

The change from a liquid to a vapor is called ____________________.

Technician A says European and Japanese manufacturers shipping vehicles to the US will eliminate R-134a A/C systems by 2017. Technician B says the United States will switch to R-22 in 2015. Who is correct?

The customer has reported that little heat comes out of the floor duct. Technician A says the coolant level in the engine's cooling system may be low. Technician B says the engine's thermostat may be faulty. Who is correct ?

A malfunctioning engine thermostat can be the cause of poor heater performance.

The blower motor does not run in any fan switch position. A check with a DMM reveals that power is getting to the motor. Technician A says the motor ground is bad. Technician B says the motor is burned out. Who is correct?

Which statement is true?

What tool would you use to check the operation of a vacuum motor?

Technician A says the receiver/drier is located on the low [pressure] side of the A/C system. Technician B says the accumulator is located on the low side of the system. Who is correct?

An A/C system cools the air by moving heat from the confined space of the passenger compartment to the engine cooling system.

If little or no resistance is felt while operating the temperature control lever, the problem is most likely which of the following?

Technician A says R-12 air-conditioning technicians must be certified. Technician B says R-12 air-conditioning equipment must be certified. Who is correct?

When the air-conditioning is set to the maximum position, passenger compartment air is ____________________.

Describe the function of a cycling clutch in an air-conditioning system.

PAG oil works well with R-12 refrigerant.

Heater control valves are operated by a ______.

Aluminum tubing is often used to connect air-conditioning components where flexibility is not required.

What type of vehicle uses heater cores with electric PTC heater strips?

The ____________________ displacement compressor automatically changes volume and the amount of refrigerant flow.

In an automotive A/C system the substance used to move heat from the passenger compartment to the outside air is called the ____________________.