Deck 6: Air Conditioning Systems

Question 1

Heat energy that was once in the cab of the vehicle is absorbed by the refrigerant and flows to the _________ where it is dissipated to the ambient air.

A) Evaporator
B) Receiver drier
C) Compressor
D) Condenser

Answer 1

D

Question 2

What energy source causes the refrigerant entering the evaporator to change states as it flows through?

A) Radiant heat energy
B) Heat from the engine cooling system
C) Heat from the interior of the cab
D) Heat of compression

Answer 2

C

Question 3

Where would you not find a high pressure relief valve?

A) Compressor outlet
B) Condenser outlet
C) Accumulator
D) Receiver-drier

Answer 3

C

Question 4

The purpose of the compressor clutch is:

A) To allow the compressor to change gears more easily.
B) To assist in matching the speed of the compressor to the engine crankshaft.
C) To control the operation of the compressor on or off.
D) To prevent shock loading the compressor drive pulley.

Question 5

Where is the capillary tube of the thermostatic control switch positioned?

A) In the air stream of the evaporator
B) Deep inside the evaporator coil
C) Deep inside the condenser coil
D) To the evaporator outlet pipe

Question 6

Which of the following conditions can cause compressor damage?

A) Low ambient temperature
B) Excessively high system pressure
C) Low system operating pressure
D) All of the above can cause compressor damage under the right circumstances

Question 7

One ton of refrigeration capacity is equal to:

A) 1,200 BTUs per hour
B) 12,000 BTUs per hour
C) 120,000 BTUs per hour
D) 1,200,000 BTUs per hour

Question 8

Which part of the clutch mechanism is built into the drive pulley?

A) The compressor shaft
B) The field coil
C) The rotor
D) The electro magnetic

Question 9

Which of the following states will refrigerant not be in as it flows through the evaporator?

A) Superheated refrigerant vapor
B) Saturated liquid
C) Sub cooled liquid
D) Superheated liquid

Question 10

What condition will refrigerant not be in when it reaches the receiver-drier?

A) High pressure liquid
B) Low pressure liquid
C) Superheated vapor
D) Sub cooled liquid

Question 11

Which of the following statements is true regarding the fixed orifice tube system?

A) The fixed orifice tube system also uses a receiver drier.
B) The evaporator is designed to operate in a flooded state.
C) The accumulator is on the inlet side of the evaporator.
D) The accumulator is designed with a pick-up tube insuring only liquid refrigerant can return to the compressor.

Question 12

As liquid refrigerant exits the thermostatic expansion valve it enters the:

A) Condenser as a low pressure vapor
B) Evaporator as a high pressure liquid
C) Condenser as a high pressure liquid
D) Evaporator as a low pressure liquid with a trace of flash gas

Question 13

Which of the following does the trinary switch not control?

A) High system pressure
B) Low system pressure
C) Cycling of the cooling fan
D) Fan timer

Question 14

Which of the following switches can cycle the compressor clutch?

A) Thermostatic switch
B) Pressure cycling switch
C) Trinary switch
D) All of the above have the ability to cycle the clutch

Question 15

What is the state of the refrigerant as it leaves the accumulator?

A) Sub cooled liquid
B) Superheated vapor
C) Superheated liquid
D) Sub cooled vapor