Deck 5: Air-Conditioning Components: Metering Devices, Evaporator, Accumulator

Question 1

What information is not needed to calculate superheat setting of an air conditioning system?

A) Suction pressure at the compressor
B) Evaporator inlet temperature
C) Evaporator outlet temperature
D) Saturation temperature of suction line from pressure temperature chart

Answer 1

B

Question 2

Which of the following is the accumulator not responsible for?

A) Separating liquid refrigerant from vaporous refrigerant.
B) Insuring that only vaporous refrigerant can return to the compressor.
C) Insuring the only liquid refrigerant can return to the compressor.
D) Removing moisture and contaminants from the circulating refrigerant.

Answer 2

C

Question 3

Identify which of the following is a device used control the amount of refrigerant entering the evaporator.

A) Remote bulb
B) Capillary tube
C) Thermostatic expansion valve
D) Throttling valve

Answer 3

C

Question 4

Which of the following is not a consideration of the amount of refrigerant that is able to pass though a fixed orifice tube?

A) The pressure differential between the inlet and outlet of the orifice tube.
B) The size of the orifice.
C) The amount of subcooling that the refrigerant has been allowed to achieve.
D) The amount of superheat the refrigerant has achieved before it reaches the orifice tube.

Question 5

Which of the following statements about ah H-block thermostatic expansion valve is not true?

A) The H-block TXV contains two refrigerant passages one from the condenser to the evaporator and the other passage is from the evaporator outlet to the inlet of the compressor.
B) The H-block TXV is considered an internally equalized valve.
C) The H-block TXV is considered an externally equalized valve.
D) The H-block TXV is capable of sensing the temperature of the refrigerant directly at the evaporator outlet.

Question 6

The remote bulb is fastened to:

A) The inlet of the evaporator
B) The inlet of the condenser
C) The outlet of the evaporator
D) The outlet of the condenser

Question 7

When the pressure of the gas inside the remote valve increases it will be transmitted to the diaphragm and try to compress the ______________ to open the valve seat to allow refrigerant to pass.

A) Refrigerant
B) Superheat spring
C) The needle valve
D) Capillary tube

Question 8

Where is the evaporator usually mounted?

A) In front of the trucks radiator
B) On the front right frame rail of the vehicle
C) To the air to air cooler
D) In the cab of the tuck below the dash

Question 9

What component contained in the accumulator will absorb moisture from the refrigerant as it flows through?

A) The vapor return tube
B) The liquid bleed hole
C) The filter screen
D) The desiccant bag

Question 10

In regards to internally equalized and an externally equalized thermostatic expansion valves identify the incorrect statement?

A) The pressure exerted on the bottom of the diaphragm of an internally equalized expansion valve stems from the evaporator inlet.
B) The pressure exerted on the bottom of the diaphragm of an externally equalize expansion valve stems from the evaporator inlet.
C) The pressure exerted on the bottom of the diaphragm of an externally equalized expansion valve stems from the evaporator outlet.
D) The pressure exerted on top of the diaphragm on either style of valve stems from the remote bulb.

Question 11

In regards to refrigerant flow through a fixed orifice tube:

A) It enters as a high pressure liquid
B) It enters as a low pressure liquid
C) It leaves as a low pressure gas
D) It leaves as a high pressure liquid

Question 12

The capillary tube connects the:

A) Inlet to the outlet of the thermostatic expansion valve
B) The remote bulb to the diaphragm of the thermostatic expansion valve
C) The evaporator inlet to the evaporator outlet
D) The remote bulb to the thermostatic expansion valve seat

Question 13

An accumulator is used in an air conditioning system that uses a __________________ for a metering device?

A) Thermostatic expansion valve
B) Orifice tube
C) Throttling valve
D) Refrigerant regulator

Question 14

If the remote bulb was removed from the evaporator outlet what would happen to the thermostatic expansion valve?

A) It would open fully
B) It would open only half way
C) It would close completely
D) It would have no effect on the thermostatic expansion valve because it is controlled by pressure

Question 15

Which color of orifice tube will allow the most refrigerant to pass through it?

A) Red
B) Orange
C) Green
D) Brown