Question 1

When charging a refrigeration system with a near-azeotropic mixture, what must be done to prevent liquid from entering the system?

Accepted Answer

A)  Charge only as a vapor through the high side. 
B)  Charge only liquid through the high side. 
C)  Charge as a liquid through the low side using a restrictor. 
D)  Charge as a vapor through the low side using a resistor. 
A)  Charge only as a vapor through the high side. 
B)  Charge only liquid through the high side. 
C)  Charge as a liquid through the low side using a restrictor. 
D)  Charge as a vapor through the low side using a resistor. C

Question 2

A manufacturer's charging chart may be used when available to determine the correct charge for a system.

Accepted Answer

A) True 
 B)False  True

Question 3

One good feature of an electronic charging scale is that it counts upward as refrigerant is removed, to tell the technician how much refrigerant was used.

Accepted Answer

A) True 
 B)False  True

Question 4

When adding refrigerant in liquid form into the high-side of the system, the system motor/compressor assembly is running.

Accepted Answer

A) True 
 B)False

Question 5

When charging a system with vapor refrigerant from a refrigerant cylinder, the cylinder will become ____.

Accepted Answer

A)  cold 
B)  very warm 
C)  the same temperature as the ambient air 
D)  very cold 
A)  cold 
B)  very warm 
C)  the same temperature as the ambient air 
D)  very cold

Question 6

Refrigerant in vapor form is normally put into the system through the ____.

Accepted Answer

A)  liquid line 
B)  suction line 
C)  hot gas line 
D)  liquid return line 
A)  liquid line 
B)  suction line 
C)  hot gas line 
D)  liquid return line

Question 7

The factory charge in a split system, using R-22, shows 6 lb. 8 oz. in the outdoor condensing unit and 2 oz. in the evaporator. The 3/8" liquid line contains 0.48 oz. per foot and the 7/8" suction line contains 0.10 oz. per foot. The refrigerant lines are 30' long. What is the correct refrigerant charge for this system?

Accepted Answer

A)  6 lb 10 oz. 
B)  6 lb 15 oz. 
C)  7 lb 7 oz. 
D)  7 lb 11 oz. 
A)  6 lb 10 oz. 
B)  6 lb 15 oz. 
C)  7 lb 7 oz. 
D)  7 lb 11 oz.

Question 8

Using a restrictor, liquid refrigerant can be charged into the low-side of the system with the system operating.

Accepted Answer

A) True 
 B)False

Question 9

If 30 oz. of refrigerant are to be added to a refrigeration system and the supply cylinder weighs 26 lb. 4 oz. before any is added, what will the supply cylinder weigh after the system has been charged?

Accepted Answer

A)  22 lb 8 oz. 
B)  24 lb 6 oz. 
C)  24 lb 8 oz. 
D)  22 lb 4 oz. 
A)  22 lb 8 oz. 
B)  24 lb 6 oz. 
C)  24 lb 8 oz. 
D)  22 lb 4 oz.

Question 10

If a critically charged refrigeration system is over charged, which of the following is a likely result?

Accepted Answer

A)  Increased cooling capacity. 
B)  Reduced compressor discharge temperature. 
C)  Increased system efficiency. 
D)  Increased operating pressures. 
A)  Increased cooling capacity. 
B)  Reduced compressor discharge temperature. 
C)  Increased system efficiency. 
D)  Increased operating pressures.

Question 11

The ____________________ is used to help technicians perform a number of tasks including taking pressure readings on the high side of the system and trapping all of the system refrigerant in the receiver to perform system service.

Accepted Answer

The answer of The ____________________ is used to help technicians...

Question 12

When charging liquid refrigerant from a single valve supply cylinder, the cylinder is placed ____.

Accepted Answer

A)  upside down 
B)  right side up 
C)  on its side 
D)  in any position indicated 
A)  upside down 
B)  right side up 
C)  on its side 
D)  in any position indicated

Question 13

Refrigerant in liquid form is normally put into the system through the ____.

Accepted Answer

A)  liquid line 
B)  suction line 
C)  hot gas line 
D)  liquid return line 
A)  liquid line 
B)  suction line 
C)  hot gas line 
D)  liquid return line

Question 14

The charging device that holds refrigerant, has a visible column of liquid, and can be used to "visually" see the amount of refrigerant used is called the ____________________.

Accepted Answer

The answer of The charging device that holds refrigerant, has...

Question 15

When the warm refrigerant cylinder is connected to an operating system, the pressure in the cylinder will be ____________________ than the suction pressure of the system.

Accepted Answer

The answer of When the warm refrigerant cylinder is connected...

Question 16

When the system pressures are lower than the pressure in the refrigerant tank, such as when the system has just been evacuated or if the system is out of refrigerant, refrigerant can be added to both the high and low pressure sides of the system.

Accepted Answer

A) True 
 B)False

Question 17

Charging a refrigeration system refers to ____.

Accepted Answer

A)  removing refrigerant from a system 
B)  adding refrigerant to a system 
C)  cleaning the refrigerant 
D)  vaporizing the refrigerant 
A)  removing refrigerant from a system 
B)  adding refrigerant to a system 
C)  cleaning the refrigerant 
D)  vaporizing the refrigerant

Question 18

Fractionation occurs when ____.

Accepted Answer

A)  some of a blended refrigerant evaporates or condenses before the rest of the blend 
B)  when only a fraction of the total charge has been added to a system 
C)  the operating pressures of a system increase 
D)  Both a and c. 
A)  some of a blended refrigerant evaporates or condenses before the rest of the blend 
B)  when only a fraction of the total charge has been added to a system 
C)  the operating pressures of a system increase 
D)  Both a and c.

Question 19

The quickest method to charge a system is to charge only vapor.

Accepted Answer

A) True 
 B)False

Question 20

Refrigerant in vapor form is added to an operating system through the ____________________ side of the system.

Accepted Answer

low-pressu

Exam 10: System Charging

When charging a refrigeration system with a near-azeotropic mixture, what must be done to prevent liquid from entering the system?

A manufacturer's charging chart may be used when available to determine the correct charge for a system.

One good feature of an electronic charging scale is that it counts upward as refrigerant is removed, to tell the technician how much refrigerant was used.

When adding refrigerant in liquid form into the high-side of the system, the system motor/compressor assembly is running.

When charging a system with vapor refrigerant from a refrigerant cylinder, the cylinder will become ____.

Refrigerant in vapor form is normally put into the system through the ____.

Using a restrictor, liquid refrigerant can be charged into the low-side of the system with the system operating.

If 30 oz. of refrigerant are to be added to a refrigeration system and the supply cylinder weighs 26 lb. 4 oz. before any is added, what will the supply cylinder weigh after the system has been charged?

If a critically charged refrigeration system is over charged, which of the following is a likely result?

The ____________________ is used to help technicians perform a number of tasks including taking pressure readings on the high side of the system and trapping all of the system refrigerant in the receiver to perform system service.

When charging liquid refrigerant from a single valve supply cylinder, the cylinder is placed ____.

Refrigerant in liquid form is normally put into the system through the ____.

The charging device that holds refrigerant, has a visible column of liquid, and can be used to "visually" see the amount of refrigerant used is called the ____________________.

When the warm refrigerant cylinder is connected to an operating system, the pressure in the cylinder will be ____________________ than the suction pressure of the system.

When the system pressures are lower than the pressure in the refrigerant tank, such as when the system has just been evacuated or if the system is out of refrigerant, refrigerant can be added to both the high and low pressure sides of the system.

Charging a refrigeration system refers to ____.

Fractionation occurs when ____.

The quickest method to charge a system is to charge only vapor.

Refrigerant in vapor form is added to an operating system through the ____________________ side of the system.

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