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Millright Thoery 2/ March > Compressors > Flashcards

Compressors Flashcards

0
Q

A double acting piston is connected directly to the connecting rod? True or false?

A

False it is connected to the CrossHead

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1
Q

The purpose of a crosshead is to keep the………… Centred in the packing throughout the full stroke

A

Piston rod

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2
Q

What causes reciprocating compressor valves to open?

A

The pressure differential

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3
Q

Intercoolers are used on double…………. Compresses to cool the air

A

Stage

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4
Q

List the three components that the Alberta boilers safety association requires to be installed on every air receiver?

A

Safety relief valve
Pressure gage
Drain

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5
Q

If there is any possibility of a blockage in a compressed air system what must be installed on the pressure side

A

The safety relief valve

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6
Q

Compressor capacity is usually determined by the amount of gas that enters the suction inlet in a given period of time?
True or false?

A

True

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7
Q

A two-stage compressor must compress the gas on both sides of the piston?
True or false

A

False it can be single acting

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8
Q

Double acting compresses compress the gas on both sides of the piston? True or false?

A

True

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9
Q

0° Kelvin is equal to 273°C?

True or false

A

True

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10
Q

Atmospheric pressure at sea level is equal to how many of each of the following?
Bar?
Psi?
Kpa?

A

Bar=1
Psi=14.7
kPa=101.4

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11
Q

You calculate gauge pressured by adding 14.7 to an absolute scale reading?
True or false

A

False, You subtract 14.7psi

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12
Q

Compressed air operates in much the same manner as well in a hydraulic system except for two major differences, what are these two differences?

A

Gases are compressible

Gases expand to fill any container

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13
Q

List the three ways air pressure can be increased?

A

Heat it
Reduce the volume
Add more gas into a confined space

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14
Q

Define pascal’s law

A

Pressure in a confined static fluid acts equally and in all directions at right angle of 90°

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15
Q

When pressure is increased in an enclosed space, The Temperature:

A

Increases

16
Q

If the flow rate is Constant and the velocity is decreased, there will be a………. In pressure.

A

Increase

17
Q

With an increase in altitude, hey compressor needs………….. Power to drive the compressor.

A

Less

18
Q

The combined gas law demonstrates the relationship between three variables before and after compression. State the formula that shows the relationship.

A

P1xV1/T1=P2xV2/T2

19
Q

Which compressor has the power pistons and the compression pistons sharing the same crankshaft?

A

The integral

20
Q

List the two reciprocating compressors are particularly suited to oil free delivery.

A

Labyrinth and diaphram

21
Q

Positive displacement compresses work on the principle of trapping a specific volume of air and then reducing that volume to get a higher pressure? True or false?

A

True

22
Q

How do you compresses move gases work?

A

They raise the gas pressure

23
Q

What is displacement?

A

Displacement is the total volume of air actually moved out of the compression cylinder in a given unit of time.

24
Q

What is pressure ratio

A

Pressure ratio is a ratio of the absolute discharge pressure compared to the absolute intake pressure.

25
Q

What is Volumetric efficiency?

A

Volumetric efficiency is a ratio of the actual compressor capacity compared to the calculated displacement and is expressed as a percentage

26
Q

What is swept volume

A

Swept volume refers to the volume of air that is swept or pushed out of the cylinder on the compression stroke

27
Q

What is clearance volume?

A

Clearance volume refers to the space between the piston and the cylinder head when the piston is at top dead center.

28
Q

Standard cubic foot

A

Hey standard foot of gas is the amount of gas that fills one cubic foot volume exactly at standard conditions

29
Q

What is staging

A

Single stage compression refers to those compresses in which compression from initial to final pressure is completed in one single step or stage.

30
Q

What is a single acting compressor

A

Compression occurs on only one side of the piston, or compression occurs on only one stroke for every revolution of the crank shaft.

31
Q

What is a double acting compressor

A

Compression stroke occurs on each stroke of the piston (on both sides) or compression occurs on two strokes for every revolution of the crankshaft

32
Q

What is venting

A

Before work on a compressed air system the pressure inside must be vented.

33
Q

What is a clearance pocket

A

Clearance pocket increases the clearance volume to reduce the compresses efficiency.

34
Q

What is Rod loading?

A

Rod loading refers to the sum of the suction and discharge pressures acting on both sides of a double acting compress piston

35
Q

What is Rod reversal

A

Rod reversal is a reciprocating compressor term that has to do with the alternate compression and tension forces of the piston rod during operation

Millright Thoery 2/ March (21 decks)

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