Tpc 436

Question 1

In a cooling system one of the main lines in the piping system is the _______ line.

Answer 1

Liquid

Question 2

Steel pipe is typically joined by means of?

Answer 2

Flanges

Question 3

Tubing is often preferred over piping in a cooling system because it?

Answer 3

Absorbs vibration better

Question 4

Refrigeration tubing is typically joined by?

Answer 4

Soldering

Question 5

When brazing tubing to a fitting, you should first heat the ________ until the ______ melts.

Answer 5

Tubing
Flux

Question 6

The function of the discharge line in a refrigeration system is to?

Answer 6

Convey the refrigerant to the condenser

Question 7

The entrainment of compressor oil is the _________________________ with the moving refrigerant.

Answer 7

Drawing in and transporting of oil

Question 8

In order to keep entrained oil droplets moving through the piping, the refrigerant must move at __________ in horizontal piping and __________ in a vertical riser

Answer 8

500 to 700 fpm
750 to 1500 fpm

Question 9

Refrigerant can be prevented from collecting in the compressor during the off cycle by installing a _________ in the __________.

Answer 9

Check valve
Discharge line

Question 10

Accessories often added to a discharge line include a ___________.

Answer 10

Discharge muffler

Question 11

Subcooling is desirable in the liquid line because it?

Answer 11

Reduces the volatility of the refrigerant

Question 12

If the pressure in the liquid line drops, flash gas can form, which can reduce the?

Answer 12

Refrigerant effect

Question 13

With halocarbons refrigerants, the movement of oil is better in the liquid line than in the discharge line, because the…

Answer 13

Oil is miscible in most liquid refrigerant

Question 14

A liquid receiver is used to?

Answer 14

Store all the refrigerants during repairs

Question 15

The purpose of a solenoid valve in the liquid line is to stop the flow of refrigerant to the?

Answer 15

Evaporator

Question 16

A double suction riser installed in a cooling system enables the system to operate at maximum load without creating excessive _________ in the suction line.

Answer 16

Pressure drop

Question 17

An accumulator in the suction line traps oil and liquid refrigerant to keep it from entering the __________. A heater in the accumulator evaporates the __________.

Answer 17

Compressor
Refrigerant

Question 18

An evaporator-pressure regulator valve closes part way if the pressure at the evaporator outlet becomes to ____. A crankcase-pressure regulator valve closes part way if pressure at the compressor inlet becomes to _____.

Answer 18

Low
High

Question 19

The suction line is insulated in order to prevent or reduce ________________ of the line.

Answer 19

Condensation on the outside

Question 20

The amount of oil that can build up in the suction line of an idle single-compressor system is much _______ than the amount that can build up in an idle compressor of a multiple-compressor system. To prevent damage from excessive build up, the suction line should include a trap with the minimum rise of ______.

Answer 20

Less
14 inches

Question 21

Piping problems that result in operating problems are often caused by?

Answer 21

Liquid hammer

Question 22

Which of the following expansion joints can be used in a refrigerant line?

Answer 22

Bellows

Question 23

Which kind of support is appropriate for a horizontal piping run of 15ft long?

Answer 23

Rod type hanger

Question 24

The problems caused by vibration in the piping of a cooling system include?

Answer 24

Damage to the valves and controls

Question 25

Insulation is needed on the liquid line if the line is ________ than its surroundings. The purpose of insulation on the liquid line is to prevent the loss of any _________ of the refrigerant.

Answer 25

Much colder
Subcooling