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Refrigeration 195 > Chapter - 116,117 > Flashcards

Chapter - 116,117 Flashcards

1
Q

What are the three classes of compressors?

A

Reciprocating
Rotary
Centrifugal

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2
Q

EXAM QUESTION

The operating cycle of a reciprocating compressor has two strokes, what are they?

A

Suction and discharge

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3
Q

What are the three types of reciprocating compressors?

A

Hermetic
Open
Semi-hermetic

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4
Q

What is the difference between a hermetic compressor and a semi-hermetic compressor?

A

Hermetic is un-serviceable and semi-hermetic can be serviced in the field

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5
Q

Reciprocating compressors are also identified by?

A

The number of cylinders

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6
Q

What are the two types of crankshafts?

A

Eccentric and conventional

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7
Q

What are the two types of compressor valves?

A

Flexible reed and disc and non-flexible valves

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8
Q

What is the role of a safety head?

A

It lifts when excessive pressure occurs in the cylinder

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9
Q

What are the types of compressor bearings?

A

Sleeve and shell

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10
Q

How are the bearings lubricated?

A

By the splash system or the pressure system

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11
Q

What are the three designs of Rotary compressors?

A

Single blade
Rotating sliding vane
Helical rotor

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12
Q

The screw compressor is a…?

A

Positive displacement unit

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13
Q

What is the advantage of a centrifugal compressor?

A

It’s simplicity of operation

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14
Q

What are the four types of compressor seals?

A

Packing gland seal
Bellows seal
Diaphragm seal
Rotating mechanical seal

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15
Q

What is piston displacement?

A

It is the volume of refrigerant that can be circulated through all the cylinders in a reciprocating compressor

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16
Q

What is pressure ratio?

A

It’s the clearance volume plus the piston displacement divided by the clearance volume

17
Q

Which compressor type requires the use of a shaft seal?

A

Open type

18
Q

What are the two main heat exchangers use in a refrigeration system?

A

Evaporator and condenser

19
Q

What are the two classes of evaporators?

A

Dry and flooded

20
Q

What is the difference between a dry evaporator and a flooded evaporator?

A

A dry evaporator contains only a small amount of liquid refrigerant at any time whereas the flooded evaporator is almost always completely filled with liquid

21
Q

What are the four types of evaporators?

A

Bare tube
Plate surface
Finned tube
Shell and tube

22
Q

What is a shell and tube evaporator also known as?

A

A Chiller

23
Q

What are the three types of condensers?

A

Air cooled
Water cooled
Evaporative

24
Q

Explain how an air cooled condenser works

A

It uses air to remove heat from the refrigerant vapour, vapour flows through tubes while the cooling air is circulated by fans around the outside of the tubes

Refrigeration 195 (5 decks)

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