Deck 4: Air Conditioning Components: Compressor, Condenser, and Receiver-Drier

Question 1

A variable displacement compressor:

A) Cycles the clutch to regulate temperature
B) Changes the compressor displacement to regulate the temperature
C) Uses control valve to change the angel of the wobble plate
D) Both statements B and C are correct

Answer 1

D

Question 2

In order for the air condition system to operate properly the refrigerant in the condenser must be:

A) At a higher temperature than the ambient air
B) At a lower temperature than the ambient air
C) At approximately the same temperature as the ambient air
D) It does not matter what temperature the refrigerant enters the condenser

Answer 2

A

Question 3

Where would you expect to find the condenser mounted on the truck?

A) On the fire wall
B) Inside the truck cab
C) Inside the bunk
D) In front of the engine radiator

Answer 3

D

Question 4

Of the following compressor styles which one uses the fewest moving parts?

A) Swash plate style
B) Rotary vane style
C) Scotch yoke style
D) Scroll type

Question 5

In regards to the two lines that are attached to the compressor:

A) The smaller line is the discharge line
B) The larger line is the discharge line
C) The larger line is the suction line
D) Both A and C are correct statements

Question 6

What is contained in the receiver-drier that captures the moisture that has entered the air conditioning system?

A) The pickup tube
B) The desiccant
C) The strainers
D) The sight glass

Question 7

How is air forced through the fines of the condenser?

A) Ram air effect as the vehicle moves forward
B) An engine mounted fan that pulls air through the condenser
C) An air pump driven off the engine turbo charger
D) Both statements A and B are correct

Question 8

If the receiver drier becomes saturated which of the following could occur?

A) The excess moisture can react with the refrigerant to form hydrochloric acid
B) The moisture can collect together and freeze into a blockage
C) An operator may complain that the air conditioning system works intermittently
D) All of the above may occur

Question 9

In regards to the two piston compressor what causes the intake read valve to open?

A) Spring pressure
B) The camshaft
C) Differential pressure
D) Crankshaft rotation

Question 10

Identify the two refrigerant lines that are attached to the compressor.

A) The exhaust and intake lines
B) The suction and discharge lines
C) The turbo and induction lines
D) The liquid and vapor lines

Question 11

If a drier becomes restricted it may be detected by _____________________ when the system is operating.

A) Higher than normal drier temperature
B) Lower than normal drier temperature
C) A warm dryer inlet and a cold dryer outlet temperature
D) A rise in suction pressure

Question 12

What happens to the superheated refrigerant as it passes through the condenser?

A) The refrigerant comes in contact with the hot ambient air and becomes further superheated.
B) The refrigerant is cooled causing it to change into a vaporous state.
C) The refrigerant is cooled causing it to change states into low pressure liquid.
D) The refrigerant is cooled causing it to change states into high pressure liquid.

Question 13

Which of the following functions does the receiver-drier not perform?

A) Filters refrigerant
B) Causes refrigerant to change states
C) Removes moisture from refrigerant
D) Stores refrigerant

Question 14

Which of the following is true when mounting a receiver-drier?

A) The refrigerant lines must be connected to the correct drier in and out ports
B) The receiver drier must be installed in a vertical position or not more than 15 degrees from vertical
C) The drier should be installed immediately after the protective caps have been removed
D) All of the above statements are correct

Question 15

Which of the following should not be done when servicing a condenser?

A) Use a fin comb to straighten any misaligned or bent cooling fins.
B) Use a good pressure washer to remove road debris from the condenser fins.
C) Use a mild soap solution to help remove road debris from the condenser fins with a soft nylon brush.
D) Use a garden hose (low pressure) to rinse soap solution from the condenser.