Deck 14: Truck Trailer Refrigeration Components

Question 1

In regards to the condenser what type of heat transfer takes place between the copper tubing and the aluminum fins?

A) Conduction
B) Radiation
C) Convection
D) Sublimation

Answer 1

A

Question 2

Which of the following statements about the thermostatic expansion valve is NOT true?

A) The TXV divides the high and low pressure sides of the refrigeration system.
B) The TXV monitors the temperature of the evaporator outlet to adjust flow accordingly.
C) The TXV uses an equalizer line to sense the pressure at the evaporator outlet.
D) If the TXV loses the pressure signal from the sensing bulb it will go to a full open mode to prevent the evaporator from starving.

Answer 2

D

Question 3

How is the outlet pressure adjusted on a suction throttling valve?

A) Adjusting screw
B) Interchangeable springs
C) Shims behind the spring
D) Adjustment of the piston

Answer 3

C

Question 4

The main purpose of the receiver tank is:

A) To subcool refrigerant.
B) To superheat refrigerant.
C) To store refrigerant.
D) To filter refrigerant.

Question 5

In order to determine superheat what information is NOT required?

A) The evaporator inlet temperature.
B) The evaporator outlet temperature.
C) The suction pressure.
D) The saturation temperature as determined from the refrigerant pressure temperature charts.

Question 6

The filter drier:

A) Removes moisture from the refrigeration system
B) Filters out impurities
C) Contains a product called desiccant
D) All of the above are true of the drier

Question 7

What prevents compressed refrigerant from traveling back into the compressor when the piston in on its suction stroke?

A) Solenoid valve
B) Throttling valve
C) Discharge valve plate
D) Suction reed valve

Question 8

If a compressor service valve is considered to be front seated:

A) The valve blocks off the system from the compressor.
B) Blocks off the gauge port from system pressure.
C) Allows gauge port to deliver compressor pressure.
D) All the above statements are correct.

Question 9

If suction pressure was too high what components would you check to determine if they were adjusted properly?

A) Suction service valve and receiver tank service valve.
B) TXV and accumulator.
C) TXV and suction pressure regulator.
D) Safety valve and discharge regulator.

Question 10

What two components are connected to the distributor tube?

A) The condenser and the TXV
B) The evaporator and the heat exchanger
C) The heat exchanger and the accumulator
D) The evaporator and the TXV

Question 11

Which of the following statements about the heat exchanger is NOT true?

A) It further subcools liquid refrigerant before entering the thermostatic expansion valve.
B) It adds heat to refrigerant that is returning to the accumulator.
C) It Increases operating efficiency by reducing the amount of flash gas produced as refrigerant flows through the thermostatic expansion valve.
D) It decreases the pressure of the suction gas.

Question 12

What is used within the accumulator to prevent compressor oil from being trapped?

A) The accumulator check valve
B) The accumulator service valve
C) The oil pick up hole
D) The anti-siphon hole

Question 13

Vibrasobers connect:

A) The receiver tank to the drier.
B) The evaporator to the thermostatic expansion valve.
C) The condenser to the accumulator.
D) The compressor to the units copper piping.

Question 14

In regards to compressor operation:

A) The compressor draws in refrigerant vapor and pumps our refrigerant liquid.
B) The compressor draws in liquid refrigerant from the evaporator and pumps out superheated refrigerant to the condenser.
C) The compressor draws in low pressure superheated refrigerant and pumps out high pressure superheated refrigerant.
D) The compressor draws in high pressure superheated vapor and pumps out low pressure superheated vapor.

Question 15

Incorporated into the receiver tank will be a:

A) Service valve
B) Bypass check valve
C) Sight glass
D) All of the above will be part of the receiver tank assembly