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Compressor Flashcards

1
Q

0° Kelvin is equal to -273 Celsius

A

Ture

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2
Q

Atmospheric pressure at sea level is equal to how many of each of the following

Bar
Pisa
Kpa

A

1.01
14.7
101.43

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3
Q

You calculate gauge pressure by adding 14.7 to an absolute scale reading

A

False

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4
Q

Compressed air operates in much the same manner as oil in a hydraulic system expect for two major differences. What are these differences

A

-Gases are compressed
-Gases expands to the shape of a container

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5
Q

List the three ways that air pressure can be increased

A
  • increase the temperature
  • reduce volume
  • add more gas into a confined space
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6
Q

Define Pascal’s law

A

Pressure applied to a confined or static fluid is transmitted equally in all directions at a right angle to the surface

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7
Q

When pressure is increased in an enclosed space,the temperature

A

Increases

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8
Q

If the flow rate is constant and volume is decreased, there will be In pressure

A

Increase

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9
Q

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

A

P1V1/T1=P2V2/T2

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10
Q

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

A

True

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11
Q

A two-stage compressor must compress the gas on both sides of the piston

A

False

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12
Q

Double-acting compressors compress on both sides of the piston

A

True

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13
Q

Intercoolers are used on two Compressors to cool air

A

Stage

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14
Q

List the three components that Alberta boilers safety associations requires to be installed on any air receiver

A

Gauge Drain Safety relief valve

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15
Q

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

A

Safety relief valve

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16
Q

Positive displacement compressor work on the principal of trapping a specific volume of air and then reducing that volume (compressing) to get a higher pressure

A

True

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17
Q

How do compressors move gases and do work

A

Raise gas pressure

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18
Q

List two reciprocating compressors that are particularly suited to oil-free air delivery

A

Labyrinth
Diaphragm

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19
Q

Which compressor has the power piston and the compression piston sharing the same crankshaft

A

Intergral

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20
Q

The purpose of the crosshead is to keep the centred in the packing throughout the full stroke

A

Piston rod

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21
Q

A double acting piston is connected directly to the connecting rod

A

Fale

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22
Q

What causes reciprocating compressor valves to open

A

Pressure differential

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23
Q

List four principles elements necessary in all compressor valves

A

Seat
Guard
Sealing elements
Assembly elements

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24
Q

Compressor valves are opened by the reciprocating action of the piston

A

Fale

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25
Leaking suction valves can result in increased discharge valve temperature
True
26
The concentric ring valve has the lowest capacity of any of the valves because of the restricted passages
False
27
The dampened disc valve is the valve best suited to high speed service
True
28
List three methods to leak test a compressor valve
Liquid leak test Pressure drop test Flow meter test
29
It is not necessary to loosen the locking cap nut and set screw on a valve cover prior to disassembly
False
30
It is important to remove the valve cover bolts before loosening the center screw
False
31
List three measurements that must be made on an overhauled channel valve
End clearance Side clearance Lift check
32
Why is it a good idea to bar the compressor over at least three times prior to start up
Check for protruding valve assembly elements
33
On a larger two stage double acting compressor it is most likely that the first stage piston in made of aluminum while the second stage piston is made of cast iron to help to balance the reciprocating weight
True
34
Rod reversal refers to the movement of the crosshead pin under alternating forces of compression and tension
True
35
Piston speed is constant while travelling from BDC to TDC
False
36
Decreasing suction pressure results in compressor rod loading
Increasing
37
The proper way to set clearance between the piston and the cylinder head is to have 2/3 on the head end and 1/3 of total clearance left on the crank end
True
38
What happens if the surface on a piston rod is scratched or damaged
It could ruin the seal through the packing seal area or oil wiper
39
What is the purpose of properly setting the piston to the head clearance
Prevent the piston from hitting the head during operation
40
Inlet cooling water temperature should be slightly warmer than the inlet gas temperature
True
41
The top of the cylinder is the best location for the cooling water inlet to keep the cylinder full of coolant
False
42
Clearance pockets are used primarily to control pressure
False
43
Name two types of cylinder liners
Dry Wet
44
We inspect ( measure) cylinders to see if they are
Straight Round within specified dimensions
45
When a cylinder is hydro tested after an overhaul the test pressure used is 1 1/2 times normal operating pressure
True
46
A honed surface on a cylinder surface promotes what two things
Cylinder and ring lubrication Ring sealing and break in
47
List 4 different ways that a compressor packing must be able to move in order to work efficiently
Axially Rotate Laterally Expand contract
48
The markings on oil wiper rings must face the cylinder side for proper installation
False
49
A burr between the mating surface of the cylinder and distance piece can cause rod runout
True
50
The distance piece serves what 4 purposes
Prevents cylinders leaking compression gas Oil from the crankcase or main frame travelling along piston rod Allows access to piston rod runout reading
51
What basic style of distance piece would you most likely need for an absolutely oil free application
Long distance piece and head
52
A bent flange on a distance piece will not affect rod runout
False
53
The purpose of the crosshead and guides is to make packing seal efficiently on the piston rod
True
54
Cross heads with shimmable shoes provide for rod runout adjustment in both the vertical and horizontal planes
Fale
55
The purpose of performing a rod runout check is to ensure that the cylinder bore and crosshead centre line are at the same level
True
56
You take rod runout readings through the distance piece access holes and perform them in both horizontal and vertical planes
True
57
The function of a connecting rod is to convert rotating motion to reciprocating motion
True
58
The large end of a connecting rod has a
Shell bearing
59
All connecting rods are symmetrical and are thrust impossible to install incorrectly
False
60
Setting of a foundation of a reciprocating compressor would most likely show up as damage to
Main bearing
61
You use wire alignment on main bearing in order to check for roundness
False
62
You should paint the inside of a compressor frame in order to reduce rusting
Ture
63
You can use wire alignment to find stress cracks in the frame
False
64
What tool do you use to check the crankshaft for misalignment
Deflection gauge
65
Twice the throw on a crankshaft is equal to the stroke of the piston
True
66
A common method of straightening a bent crankshaft is to tap it lightly with a small ball peen hammer
True
67
List 4 signs of failure a compressor bearing in service may show
Excessive heat in the bearing area Lubricating oil pressure decreases due to increased clearance from wear Excessive vibration in the bearing area Excessive amperage draw from the electric motor
68
Low oil pressure can be caused by a suction inlet pipe having leaky threads
True
69
High viscosity oil causes a rise in oil pressure because it is harder to pump
True
70
Low viscosity oil provides a good seal at high pressure
False
71
A no flow device shuts the equipment down if flow is lost for any reason
True
72
Air cleaner restriction can be checked in the following two ways
Air cleaner service Water monometer
73
Paper filter elements are commonly used for ambient air with high dirt concentration
False
74
Aftercoolers are designed to knock out moisture
True
75
It is common to keep the incoming coolant water temperature lower than the temperature of the incoming gas
False
76
Higher pressure or non lubricated applications often require water cooling of the packing case
True
77
What device measures rod drop
Proximity probe
78
You commonly purge soure gas compressor with sweet gas which eliminates and danger during the overhaul
False
79
Failure to operate the unloading clearance pockets while purging the compressor could result in the release of toxic gases released during the overhaul
True
80
An organization meeting by everyone involved to review the hazards and safety concerns is one of the per job requirements of an overhaul
True
81
You are required a work permit if the job requires the use of a torch or tool that could cause a spark
True
82
You require a work permit before starting an overhaul on a compressor that compresses sweet gas
True
83
Failure to depressurize could cause a vale cover to blow off once you remove the valve cover nuts
Ture
84
After you complete the overhaul you should have someone else remove your safety lock
False
85
Keeping the work area clean and orderly takes extra time and is not a good practice
False
86
Hydrogen sulphide gas has a distinct rotten egg smell that is noticeable in any concentration
False
87
Before starting up a compressor after an overhaul you should in order to ensure that it rotates freely
Bar
88
While barring a compressor you should have it
Unloaded
89
You should never use gasoline or diesel fuel to clean compressor parts or surfaces
True
90
Why should you flush the lubrication system after a major overhaul
To clean out contaminats
91
Why should you remove all air from the piping and compressor before start up of the compressor is going to be compressing a combustible gas
explosion may occur out
92
A major cause of compressor to drive misalignment is piping strain
True
93
You do not need to prime the lubrication system with oil if you use positive displacement oil pump
False
94
Why should you check for proper rotation if a three phase motor drives the compressor
For proper lubrication
95
What 4 items are listed in operator logs
Pressure differential Change in sound Change in vibration Temperature Change

Compressors (2 decks)

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