Refrigeration course Flashcards

1
Q

Compressor short cycling means that it is the frequent:

A

Abnormal starting and stopping

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2
Q

Which is the True statement when refrigerant is mixed with the oil in the refrigeration system:

A

It will remain unaffected by the entrained oil

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3
Q

The component that removes latent heat of vaporization superheat and heat of compression

A

Condenser

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4
Q

An increase of Suction pressure will

A

Restart the compressor automatically

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5
Q

Open ends of system under repair could cause excessive moisture if left exposed unprotected So therefore ends must be

A

Plugged

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6
Q

And oil separator separates or remove The oil from

A

Refrigerant vapor

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7
Q

To illuminate or prevent the possibility of icing of the TXV is the function of

A

Dehydrators

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8
Q

Compressor discharge line relief valve relieves Excessive pressure to

A

Compressor suction

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9
Q

Raising the internal pressure above atmospheric to Detect refrigerant leak is the method used on

A

Low pressure systems

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9
Q

Common sign of flood back or liquid refrigerant reaching the compressor

A

Sweating or frosting of the compressor crank case

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9
Q

And oil separator separates or remove the oil from

A

Refrigerant vapor

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9
Q

Elimination of refrigerant vapors in the liquid line Is done by

A

Sub cooling the liquid

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10
Q

To eliminate or prevent the possibility of icing of the TXV is the function of

A

Dehydrators

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11
Q

Refrigerating heat is the heat gained per pound of refrigerant in the

A

Evaporator

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12
Q

Compressor discharge line relief valve relieves excessive pressure to

A

Compressor suction

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13
Q

The sign of liquid refrigerant flood back to the compressor

A

Compressor oil forming

14
Q

Refrigerant that carries moisture will

A

Freeze the TXV seat and starve the flow of refrigerant

15
Q

In the event the TXV is stuck in the open position this will happen

A

Frost build up on the suction line of the compressor

16
Q

Refrigerant and oil mixture will

A

Not be affected by the presence of oil

17
Q

The low pressure switch will automatically restart the compressor when

A

Suction pressure increase

18
Q

Compressor discharge relief valve returns the excess Pressure back to the

A

Compressor suction

19
Q

Continuous operation of the compressor with box temperatures Remaining high is cause by

A

Low charge

20
Q

Flood back means

A

Liquid refrigerant reaching the compressor

21
Q

Abnormal system pressure buildup and the activation of high-pressure switch is likely caused by

A

Insufficient condenser water cooling supply

22
Ideal characteristics of oil well-suited for refrigeration use
Low pour point
23
Refrigeration oil must be
Low wax content
24
Refrigeration unit rated at 33K to 35k btu Per hour of cooling capacity has the equivalent what cooling capacity
3 tons
25
Effective way to check oil level
After prolonged period of operation and immediately after shut down