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3B2 > Ch. 8 > Flashcards

Ch. 8 Flashcards

1
Q
  1. __________ of a compressor is known as free air delivered or free air capacity.

a. Capacity
b. Displacement
c. Absolute pressure
d. Efficiency
e. Pressure ratio

A

a. Capacity

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2
Q
  1. Reciprocating compressors are suitable for_________________.

a. low pressure service
b. only high pressure service
c. all ranges of pressure
d. single stage only
e. None of the above

A

c. all ranges of pressure

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3
Q
  1. Four ways of dividing reciprocating compressors into types are:
1)     Single or double acting
2)     Method of compression
3)     Number of impellers
4)     Speed of prime mover
5)     Method of drive
6)     Cylinder arrangement

a. 3, 4, 5, 6
b. 1, 2, 5, 6
c. 1, 3, 5, 6
d. 2, 3, 4, 6
e. 1, 3, 4, 5

A

b. 1, 2, 5, 6

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4
Q
  1. ________ positive displacement compressors require intake and discharge valves.

a. Rotary
b. Centrifugal
c. Sliding vanes
d. Rotary lob
e. Reciprocating

A

e. Reciprocating

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5
Q
  1. A reciprocating compressor is suited for all ranges of ______ .

a. discharge air temperatures
b. speed
c. oil lubrication
d. cooling water temperatures
e. pressures

A

e. pressures

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6
Q
  1. Reciprocating air compressors are best suited to _____________________.

a. high speed, low volume applications
b. low pressure, high volume applications
c. low pressure, low volume applications
d. high pressure, moderate volume applications
e. high speed, high volume applications

A

d. high pressure, moderate volume applications

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7
Q
  1. Cylinder arrangements of reciprocating air compressors may be:
1)     Vertical or horizontal
2)     Rotary or simplex
3)     The V or Y type
4)     An angle type
5)     Twin impeller type

a. 1, 3, 4
b. 1, 3, 5
c. 2, 4, 5
d. 1, 2, 3
e. 2, 3, 5

A

a. 1, 3, 4

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8
Q
  1. In a multistage reciprocating compressor the highest pressure stages may be_______________________.

a. remote controlled
b. poppet valve regulated
c. double lobe
d. single acting
e. free piston

A

d. single acting

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9
Q
  1. A free piston air compressor _____________________________.

a. has a spare or free piston for air compression
b. uses one steam cylinder to drive two compression pistons
c. has a common intake and discharge valve system
d. has a cushion cylinder that acts as a flywheel
e. has two crankshaft

A

d. has a cushion cylinder that acts as a flywheel

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10
Q
  1. A double acting reciprocating air compressor __________________.

a. must have at least two pistons
b. receives and discharges air at both ends of the cylinder
c. increases the pressure twice from inlet pressure value
d. has one compression stroke for every crankshaft revolution
e. None of the above

A

b. receives and discharges air at both ends of the cylinder

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11
Q
  1. In multistage compression, the high-pressure cylinders are __________ because the volume is __________ and the pressure is __________than the lower pressure stages.
1)     smaller
2)     larger
3)     higher
4)     lower
5)     more
6)     less

a. 2, 5, 4
b. 1, 5, 4
c. 2, 4, 6
d. 2, 5, 6
e. 1, 6, 3

A

e. 1, 6, 3

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12
Q
  1. _______ and carbon rings can be used in reciprocating air compressors to deliver oil free air.

a. Brass
b. Aluminum
c. Titanium
d. Ceramic
e. Teflon

A

e. Teflon

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13
Q
  1. Oil free air may be provided by reciprocating air compressors by _______________________________.

a. use of a porous filter
b. use of an oil filter
c. nylon and brass piston rings
d. carbon or Teflon piston rings
e. use of an intercooler

A

d. carbon or Teflon piston rings

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14
Q
  1. The prime purpose of water cooling or air cooling of air compressors is to ______________________________.

a. cool the air
b. help increase moisture and volume of the air
c. keep the cylinder at a reasonable temperature
d. prevent fire from occurring in the receiver
e. prevent operator injury

A

c. keep the cylinder at a reasonable temperature

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15
Q
  1. Air compressor pistons are constructed of:
1)     Steel
2)     Cast iron
3)     Brass
4)     Aluminum
5)     Copper alloy

a. 1
b. 1, 2
c. 3, 4, 5
d. 1, 2, 4
e. 2, 3, 4, 5

A

d. 1, 2, 4

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16
Q
  1. Water cooling by water jacketing of air compressor cylinders is preferred over air cooling because _________________________.

a. the construction of the compressor is cheaper than the finned type
b. there is less piping involved
c. the construction is fairly simple
d. more efficient cooling is obtained
e. the air temperature can not be controlled

A

d. more efficient cooling is obtained

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17
Q
  1. Reciprocating compressor valves are usually found in two common forms ____________________________.

a. plate disc and channel type
b. composition and rubber
c. copper and aluminum
d. angle and inverted
e. ribbed and push rods

A

a. plate disc and channel type

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18
Q
  1. Compressor valves are usually automatic and open and close by _________________________________.

a. action of a poppet valve
b. movement of the piston covering or uncovering ports
c. operation of an air solenoid valve
d. a pressure difference
e. a camshaft

A

d. a pressure difference

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19
Q
  1. If _____________ is used then the cylinder is constructed with integral cast fins, which provide increased radiating area.

a. water cooling
b. water jacket
c. glycol cooling
d. sliding vane compressor
e. air cooling

A

e. air cooling

20
Q
  1. Compressor connecting rods are constructed of _____________.

a. cast iron
b. stainless steel
c. forged steel
d. black iron
e. brass

A

c. forged steel

21
Q
  1. A reciprocating compressor can deliver oil-free air if it ________________________________ .

a. uses an oil separator at the compressor discharge
b. uses an oil filter before the compressor inlet
c. implements a charcoal filter at the compressor discharge
d. implements carbon or Teflon piston rings
e. uses an intercooler to increase the oil viscosity

A

d. implements carbon or Teflon piston rings

22
Q
  1. Lubricating oil is necessary in an air compressor in order to perform the following functions:
1)     Provide sealing
2)     Remove heat
3)     Reduce friction
4)     Eliminate water cooling
5)     Reduce corrosion
6)     Remove carbon
7)     Prevent wear

a. 1, 2, 3, 4, 5
b. 1, 2, 3, 4, 5, 6, 7
c. 1, 3, 4, 6
d. 1, 2, 3, 5, 7
e. 1, 2, 4, 5

A

d. 1, 2, 3, 5, 7

23
Q
  1. Internal lubrication of air compressors refers to:
1)     The crankcase and crankshaft
2)     Cylinder walls and pistons
3)     Vanes and casing walls of some compressors
4)     Impellers of a centrifugal compressor

a. 2, 3
b. 1, 3, 4
c. 3, 4
d. 1, 4
e. 1, 2, 3

A

a. 2, 3

24
Q
  1. Single-acting compressors having the bottom of the cylinder open to the crankcase will have lubrication provided by _________________________.

a. a pressure lubricator
b. a force fed oil pump
c. a splash system
d. an oil ring
e. None of the above

A

c. a splash system

25
Q
  1. Compressor lubrication may be divided into two main sections __________ lubrication and __________ lubrication.
1)     peripheral
2)     internal
3)     splash
4)     external
5)     pressure

a. 1, 2
b. 3, 5
c. 3, 4, 5
d. 2, 3, 4
e. 2, 4

A

e. 2, 4

26
Q
  1. A kind of rotary compressor is _________________.

a. a two lobe
b. a cross - compound double cylinder
c. sliding piston
d. axial
e. All of the above

A

a. a two lobe

27
Q
  1. The operating speed of a typical two-stage sliding vane compressor ranges up to _____________.

a. 250 rpm
b. 5000 rpm
c. 1800 rpm
d. 3000 rpm
e. 2000 rpm

A

d. 3000 rpm

28
Q
  1. An important advantage of a sliding vane compressor is that it ___________________________________.

a. does not require internal lubrication
b. has a high starting torque
c. does not require inlet or discharge valves
d. requires light nylon timing gears
e. does not require a prime mover

A

c. does not require inlet or discharge valves

29
Q
  1. In a rotary lobe compressor one lobe is directly driven by the driving mechanism while the other lobe is driven by __________________________.

a. intermeshing with the driven lobe
b. a reduction gear
c. means of timing gears
d. speed increasing gears
e. a belt

A

c. means of timing gears

30
Q
  1. The impellers of a _________ compressor maintain their relative positions with each other by the use of timing gears.

a. siding vane
b. free piston
c. axial flow
d. angle types
e. lobe type rotary

A

e. lobe type rotary

31
Q
  1. In the ________ compressor, the male rotor has convex lobes and the female rotor has concave flutes.

a. lobe type rotary
b. axial flow
c. sliding vanes
d. rotary screw
e. free piston

A

d. rotary screw

32
Q
  1. The lobe type compressor runs at speeds up to about _________ Rev/min.

a. 1550
b. 1600
c. 1650
d. 1700
e. 1750

A

e. 1750

33
Q
  1. The rotary screw compressor usually has the _____________________.

a. male lobe driven
b. male flute driven
c. female flute driven
d. female lobe driven
e. female and male driven

A

a. male lobe driven

34
Q
  1. Rotary lobe compressors have their elements ________________________ .

a. lubricated by graphite
b. enclosed by an aluminum casing
c. as spring loaded vanes
d. revolving in opposite directions
e. lubricated by oil

A

d. revolving in opposite directions

35
Q
  1. Three different designs of rotary compressors are:
1)     Sliding vane
2)     Rotary screw
3)     Axial flow
4)     Volute centrifugal
5)     Rotary lobe
6)     Diffuser vane centrifugal

a. 2, 4, 6
b. 1, 2, 3
c. 3, 4, 6
d. 1, 3, 5
e. 1, 2, 5

A

e. 1, 2, 5

36
Q
  1. Centrifugal compressors are commonly used for ___________________.

a. low volume, high pressure applications
b. low speed, high pressure applications
c. high humidity, low volume applications
d. large volume, low pressure applications
e. large volume, low speed

A

d. large volume, low pressure applications

37
Q
  1. Adjustable diffuser vanes on centrifugal air compressors are implemented to ______________________________.

a. change the operating characteristics of the compressor
b. prevent back or reverse flow of air
c. remove foreign particles from the air
d. reduce the amount of air entering the compressor
e. change the direction of the air flow to remove moisture

A

a. change the operating characteristics of the compressor

38
Q
  1. Centrifugal air compressors are used for __________________ pressure applications.

a. changing
b. low volume, high pressure
c. low volume, low pressure
d. high volume, high pressure
e. high volume, low pressue

A

e. high volume, low pressure

39
Q
  1. For changing the air ____________ in centrifugal air compressors to ______________, volute casings and diffuser vanes are implemented.
1)     pressure
2)     volume
3)     velocity
4)     temperature

a. 1,2
b. 2,4
c. 4,1
d. 3,1
e. 4, 2

A

d. 3,1

40
Q
  1. A centrifugal air compressor may have ________ for multi-staging.

a. two or more pistons
b. two or more impellers on separate shaft
c. two or more compressors
d. two or more diffuser vanes
e. two or more impellers on same shaft

A

e. two or more impellers on same shaft

41
Q
  1. Each pair of moving and fixed blades in an axial air compressor constitutes a/an _______________.

a. pressure drop
b. temperature decrease
c. program of air
d. stage
e. obstacle

A

d. stage

42
Q
  1. Axial flow compressor advantages are similar to those of centrifugal air compressors, they have an added advantage of ______________________.

a. being lower in cost
b. being a shorter machine
c. being corrosion and erosion free
d. being approximately 10% more efficient
e. solid forged rotor

A

d. being approximately 10% more efficient

43
Q
  1. In axial air compressors, the pressure rise per stage is ____________ therefore, for high pressures ____________ stages are required.
1)     low
2)     high
3)     single
4)     multi

a. 1, 3
b. 1, 4
c. 2, 3
d. 2, 4
e. 2, 1

A

b. 1, 4

44
Q
  1. Axial flow compressor blades are subject to greater ________ and ________ than there is in a centrifugal compressor.
1)     fouling
2)     erosion
3)     corrosion
4)     cleaning

a. 1, 3
b. 1, 4
c. 2, 1
d. 3, 4
e. 2, 3

A

e. 2, 3

45
Q
  1. Axial flow compressors are _______________________.

a. a dynamic type of compressor
b. a single acting compressor
c. a rotary type of compressor
d. centrifugal compressor
e. All of the above

A

a. a dynamic type of compressor

46
Q
  1. ___________ on centrifugal air compressors are provided in order to control the amount of air flowing to the impeller and thus control the capacity of the unit.

a. Adjustable inlet vanes
b. Adjustable diffuser vanes
c. Variable frequency drive
d. Moving and fixed blades
e. Dummy piston

A

a. Adjustable inlet vanes

3B2 (15 decks)

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