Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Test Review > Reciporcating compressors > Flashcards

Reciporcating compressors Flashcards

1
Q

reciprocating compressor oil sumps are usually painted with an oil resistance coating to

keep the oil contaminants out of the oil

prevent corrosion

trap any casting sand that might be left in the sump

both the 2nd and 3rd answer is correct

A

Both second and third answers are correct

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

when designing a foundation, you must make sure that it

keeps the frame from distorting

allows proper alignment of the compressor to the driver

has sufficient mass and be isolated from rest of the building

all the above

A

All of the above

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

when doing a wire alignment on a compressor, you need to know _______________ to accomadate for wire sag between the 2 end points of the wire

the size of the wire and the weight of the wire

the size of the wire and the amount of weght attached to the end of the wire

the size of the wire, the amount of weight attached and the distance between the 2 end points

the wire will not have sag in it

A

the size of the wire, the amount of weight attached and the distance between the 2 end points

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

in a multi-stage compressor, to balance the inertial forces, pistons are

made of aluminium

heat treated

hollowed out

both the 1st and 3rd answer are correct

A

Both first and third answers are correct

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

chroming is done to rods and journal surfaces to make them long wearing

true

false

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

when balancing crankshafts you would_______________ to resolve reciprocating forces

use apposed throws and counter-weights

used apposed throws and add inertial forces

use counter weights traveling in the same direction as force

use counter-weights and add inertial forces

A

Use apposed throws and counter weights

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

if you could put a 0.002 feeler gage under the shaft at one of the main bearings, when the shaft is sitting in the bottom of all the main bearings, what would happen if you ran it this way

nothing, it is ok to run it this way

the bearings beside it would fail more quickly

the crank would have more axial float

oil flow would be minimal thru this bearing

A

The bearing beside it would fail more quickly

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

for every rvolution of the crankshaft you will have one suction stroke and one compression stroke. this would be a

double acting piston

single acting piston

A

Single acting piston

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

piston rods

are used to join the piston to the crosshead

are chrome plated to increase their life

are screwed into and locked onto the crosshead with a nut

all the above

A

All of the above

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

rod loading is when the rod

is under compression

is under tension

both the 1st and 2nd answers are correct

none of the above

A

Both first and second answers are correct

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

rod reversal is

the reversal of the rod laod from compression to tension

good for lubrication

improved with a tail rod

all the above

A

All of the above

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

excessive rod loading does ____________________ to happen

not allow misalignment

not allow corrosion

not allow full film lubrication

allows full film lubrication

A

Not allow full film lubrication

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

in a double acting piston, when the piston is at TDC, the valves are_____________

open

closed

open and closed

none of the above

A

Closed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

no oil rings exist on double-acting compressors or non-lubricated compressors

true

False

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

cast iron piston rings are used because

they are cheap

they are brittle

they conform quickly and are self-lubricating

both the 1st and 3rd answers are correct

A

First and Third answers are correct

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

oil control rings control the flow of oil on cylinder walls by

allowing oil to flow onto the wall on the up-stroke thru holes in the ring

scraping oil off the cylinder walls with the oil ring

not having an expasion ring

both the 1st and 2nd answer are correct

A

Both first and second answers are correct

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

installation of piston rings should have the gap staggered _______ degrees when the piston has 2 pressure rings

90

45

180

360

A

180 degrees

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

synthetic rings out last metallic rings in enviroments such as

abrasion

acidic gasses

corrosion

all the above

A

All of the above

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

you would check for piston ring end gap when the ring is

on the psiton and the piston is in the cylinder

in the cylinder at the smallest diameter

on the piston in the piston groove

on the bench without being installed on anything

A

In the cylinder at the smallest diameter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

piston rider bands

prevent the piston from touching cylinder during startup and operation

support 100% of the piston weight and 100% of the piston rod weght

have a tongue and groove cut ring

all the above

A

Prevents the piston from touching the cylinder during start up and operation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

uncut rider bands are machined with a interference fit. when stretched on and into their grooves, they will

shrink to a snug fit in the groove

stay loose in the groove

need a backup ring to support it

both the 2nd and 3rd answers are correct

A

shrink to a snug fit in the groove

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

a special clamping device and torque multiplier will be needed to install the ___________ into the ______________

rod, crosshead

rod, piston

crosshead, crankshaft

crankshaft, rod

A

Rod, Piston

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

the piston rod is screwed into the crosshead and locked in place with

lock nuts

balancing nuts

set screws and lock wire with the lock nut

all the above

A

All of the above

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

when removing the piston and rod from the crosshead and out of the cylinder, you will

need to record the number of turns to remove the rod from the crosshead

rotate the driver to move the crosshead out of the way

carefully pull piston and rod out thru the cylinder without scoring it

all the above

A

all of the above

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

if setting the piston clearances, when the compressor is cold, you will

set the crank head clearance at 2/3 and the head end clearance to 1/3 of the total clearance

set the crank head clearance to 1/3 and the head end clearance to 2/3 of the total clearance

set both head end and crank head clearance to 50%

make sure there is no contact at either end

A

Set the crank head clearance at 1/3 and the head end clearance to 2/3 of the total clearance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

_________________ are used to fine tune the weight balancing of opposing multi-stage reciprocating compressor parts

balancing nuts

lock nuts

set screws

lock wires

A

Balancing nuts `

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

clearance pockets can be fixed or variable and they

help match the output of the compressor to the demand of the system

can be a plug or bottle type

can be VVCP

all the above

A

all of the above

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

when reversing a clearance plug, the compressor capacity will be

increased

reduced

stay the same

none of the above

A

Reduced

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

you can only adjust the VVCP when the compressor is running

true

false

A

False

when not running

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

hydro-testing a cylinder, you would pressurize the cylinder to 1.5 times the max working pressure

true

false

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

when you have a large industrial compressor with a cylinder of 3 meters extending from the main frame, you will need to support it so the frame and distance piece do not take all the load or weight. the support is pre-loaded to take some of the weght

true

false

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

what is the shim move needed if R = 0.01, L = 36”, S = 6” R/S=X/L X= shim move

0.050

0.060”

0.075”

00.80”

A

0.060

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

the packing prevents excessive leakage of compressed gas along the piston rod and into the distance piece

true

false

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

free floating mechanical packing

moves in all directions

has cups

has segmental sealing rings

all the above

A

All of the above

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q

which of the following is NOT a type of packing ring

pressure breaker

radial cut

tangential cut

cup cut

A

Cup cut

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
36
Q

the pressure breaker ring is located

in the middle of the packing

closest to the frame

closest to the cylinder

does not matter

A

Closest to the cylinder

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
37
Q

on low pressure single sealing (one-direction) the radial ring is doweled to the tangent ring. the radial ring must be installed on the pressure side with the markings (dots) on both rings facing the pressure side

true

false

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
38
Q

the double acting ring combination, seals in both directions

true

false

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
39
Q

packing case design is dictated by type of application, pressure and compressor speed, this will determine

the # of cups and rings

if cooling is needed

if lubrication is needed

all the above

A

All of the above

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
40
Q

cup joints can be lapped with an O-ring, gasket joint or tongue and groove which helps seal between the cup faces

true

false

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
41
Q

when using lubricated and vented packing, the vent is located on the

top

bottom

A

Bottom

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
42
Q

the oil wiper ring is located

next to the cylinder in the distance piece

middle of the distance piece

crank side of the distance piece

anywhere in the distance piece

A

Crank side of the distance piece

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
43
Q

in operation, the 1st oil wiper ring turns back most of the oil to the crankcase and the rest is scraped off by the internal scraping of the ring

true

false

A

True

44
Q

the distance piece is used to

prevent cylinder leakage from pressurizing the main frame

prevent oil from the crankcase getting into the cylinder

access the packing, wipers and checking rod runout

all the above

A

All of the above

45
Q

you could use a 2 compartment distance piece to totally seal off an explosive gas coming form the compressor chamber

true

false

A

True

46
Q

the purpose of the crosshead is to centre the piston rod in the packing case

true

false

A

True

47
Q

adjustable crossheads with removable shoes can use shims at the bolt locations to alter the clearance between the crosshead and guides

A

True

48
Q

the rod nut face must be smooth and free of burrs and dirt. the mating face of the lock nut should be perpendicular to the rod nut face

true

False

A

False

must be parallel

49
Q

the lock nut is used to adjust the position of the piston by allowing the piston rod to turn into and out of the crosshead

true

False

A

True

50
Q

the connecting rod has a bias cut when you have to pull the the connecting rod thru the cylinder bore

true

False

A

True

51
Q

you need dowel pins on both sides of the parting line of the rod cap to hold the 2 halves in proper alignment

true

False

A

True

52
Q

when taking the connecting rod out, make sure to match mark the 2 pieces

true

false

A

True

53
Q

if plasitigage is not reading the proper clearance, you would look at __________ as the cause

dirt under the bearing insert

wrong size of bearing insert

beraring insert caught on tag or tap

all the above

A

All of the above

54
Q

when using locking plates to retain the crosshead pin, the device requires connecting rod and crosshead to be separated before pulling the unit

true

false

A

False

Cannot remove beforehand?????

55
Q

with single a single acting compressor, you must remove the connecting rod thru the cylinder

true

A

True

56
Q

oil starvation to the bearings causes the bearing surfaces to

over heat

wipe away

have their clearances decrease

both the 1st and 2nd answers are correct

A

Both the first and second answers are correct

57
Q

measurments taken between the crosshead and guides should measure between ____________”

0.12 to 0.15

0.17 to 0.20

0.007 to 0.010

0.001 to 0.002

A

.007 to .010

58
Q

to check for rod runout, you would put the dial indictor on top of the rod in the distance piece and cycle the crankshaft form BDC to TDC

true

false

A

True

59
Q

the largest factor effecting a compressors efficiency is

piston and ring wear

leaky packing

improper valve operation

the clearance volume

A

Improper valve operation

60
Q

the 4 components of compressor valves are sealing element, valve seat, assembly elements and valve gaurd

true

false

A

True

61
Q

when using v-shape rings and flat rings for cylinder head valves, which one has a smoother flow path and less chance of deposits forming

v-shape

flat

no difference

A

V-Shaped

62
Q

for the size of the valve, which valve allows for the least restriction to flow, since there are no flow reducing webs

ring

plate

A

Ring

63
Q

dampen disc valves are used to reduce compressor valve flutter

true

false

A

True

64
Q

alve flutter is a condition where the sealing element rebounds off the piston

true

false

A

False

Look up right answer

65
Q

feather valves do not use

pressure differential to move the strip

suction

springs

all the above

A

Springs

66
Q

bringing cooling water temperatures to above incoming gas temperatures will

prevent slugs

cause condensation in the cylinders

cause coking

all the above

A

Prevent plugs

67
Q

coking is caused by

too much water on a hot discharge valve

too much oil on a hot discharge valve

lack of heat of compression

valve flutter

A

to much oil on hot discharge valve

68
Q

too little lift in a sealing element will cause ____________________ which causes lower compressor capacity

an increase in both horsepower and gas temperature

increased valve wear

leaky valves

an increase in compressor capacity

A

An increase in both horsepower and gas temperature

69
Q

to test compressor valves and their seats for leakage, you would ___________________ and tap the valve plate and seat to clean the seal area after a slight pressure build up during the test

use a pressure drop test

use a flow meter test

use a HP test

both the 1st and 2nd answer are correct

A

Both first and second answers are correct

70
Q

when removing valves from a reciprocating compressor, you should make sure to vent the cylinder by backing off the valve cover nuts a few turns and tapping the cover to jar it loose from its seat

true

false

A

True

71
Q

valve covers should have some clearance between them and the cylinder housing after the bolts are torqued

true

false

A

True

72
Q

there is very little physicl difference between suction and discharge valves except the direction they are orientated. you can check for orientation by pushing on the sealing element. a discharge valve will open _____________________

away from the nut

towards the nut

A

Towards the nut

73
Q

in oil systems, the most important aspect of oil in a compressor system is the oils viscosity

true

false

A

True

74
Q

the best oil system for double acting compressors is

splash

gravity

splash and gravity

full pressure

A

Full pressure

75
Q

pressure in a positive displacement pump system is created by the

pump

maximum pressure relief valve

bearing clearances

none of the above

A

Bearing clearances

76
Q

the maximum pressure relief valve is there to protect the compressor oil system from excessive lube pressure

true

False

A

True

77
Q

filter systems for the lube system are usually

partial flow

full flow

mixed flow

unfiltered

A

Full flow

78
Q

metered oil is used in the

packing cases

main frame

cylinders

both the 1st and 3rd answers are correct

A

Both first and third answers are correct

79
Q

divider valves ae used to supply metered oil to many points with 1 pump

true

false

A

True

80
Q

the divider block lubrication system cannot tolerate dirt, air, gas or leaks. it must b full of oil and free of air to work properly

true

false

A

True

81
Q

you would use a venture silencer with paper filter elements with a

screw compresor

vane compressor

reciprocating compressor

none of the above

A

Reciprocating compressor

82
Q

the filter that spins the dirty incoming air to help separate the dirt from the air is the

fabric

oil-wetted labyrinth

scrubber

inertial

A

Inertial

83
Q

when cylinder cooling, the coolant should start near the discharge vlaves and exit near the suction valves

true

false

A

True

84
Q

piston rod run out would have a proximity sensor that would measure rod drop

true

False

A

True

85
Q

by opening a clearance pocket to a larger size in a compressor, you would

increase its capacity

decrease its capacity

increase valve lift

decrease valve lift

A

Decrease its capacity

86
Q

valve designs for high speed compresors will have

high lift valves

wide ports

low lift valves

no ports

A

Low lift valves

87
Q

the minimum, H2S gas amount that could kill you within 8 to 48 hrs is

0.010 %

0.050 %

00.40 %

0.030 %

A

0.010

88
Q

filling out permits will alert you to potential dangers that may be overlooked and ensures you will follow established safety routines. you will also meet with everyone involved to review the safety procedures

true

false

A

True

89
Q

following manufactures specifications will help you with understanding the procedures involved

true

False

A

True

90
Q

OEM is the best place to find someone with equipment knowledge and system knowledge of their equipment

true

false

A

True

91
Q

organizing parts and labeling of the parts will help your team (when different people will be working on the same equipment at different times or shifts)

true

false

A

True

92
Q

rotating crankshafts when compressors are in storage, would help stop

brinelling

false brinelling

spalling

flaking

A

False brinelling

93
Q

before starting up a large compressor, you should make sure to __________ after an overhaul or on a first start up

prelube the bearings

check rotation of prime mover and compressor

bar compressor over a full 360 degrees

all the above

A

all of the above

94
Q

when starting a compressor, you must shut down the compressor immediately (within 5 seconds of not having oil pressure)— normally about 45 psi

true

False

A

True

95
Q

rapidly wearing packing could be caused by an incompatible gas being compressed

true

False

A

True

96
Q

when doing a flush of the lubrication system in a reciprocating compressor system, it is necessary to bar over the compressor a 1/4 of a rotation every 15 to 20 minutes during this flush

true

false

A

True

97
Q

a tail rod is used to equalize the surface area which reduces tha capacity of the compressor but ensures rod reversal

true

false

A

True

98
Q

failure analysis collects and analyzes data to find out the causes of a failure. operator logs are an excellent source of info for analysis

true

False

A

True

99
Q

changes in oil sample readings can help detect

wear rates of bearings

the oils viscosity and additive levels

the filters efficiency level

all the above

A

All of the above

100
Q

why should you check for proper rotation if a 3 phase motor drives the compressor and it was replaced

compressor is driven in the proper direction

lube pump driven in proper direction

the wires could be reversed

all the above

A

All of the above

101
Q

labyrinth compressors use ___________to help control pressure drop across the cylinder wall and piston

piston rings

oil rings

grooves on the cylinder and piston

all the above

A

Grooves on the cylinder and pistons

102
Q

diaphragm compressors are used where _______________is needed

pulsation free air is needed

oil free air is needed

leakage is acceptable

all the above

A

Oil free air is needed

103
Q

intercoolers are used to

cool the compressed air between stages

decrease the amount of power required to compress the gas

remove moisture from the air

all the above

A

All of the above

104
Q

displacement is

the total volume of air moved out of the compressor cylinder

the total volume of air the compressor compresses divided by the compression ratio

the total volume of air moved out of the compressor cylinder in a given unit of time

total volume of air the compressor takes in divided by the compression ratio in a given unit of time

A

the total volume of air moved out of the compressor cylinder in a given unit of time

105
Q

swept volume

is equal to the area of the piston area times the length of stroke

does not include the clearance volume

includes venting

both the first and second answers are correct

A

Both first and second answers are correct

106
Q

the difference between venting and purging is

venting is pressure release while purging is cleaning the system with inert gas

venting is cleaning the system with inert gas while purging is pressure release

they both mean the same thing

all the above

A

venting is pressure release while purging is cleaning the system with inert gas

Test Review (17 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions