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Book 2 PanGlobal Assessment Test > Chapter 27 Air Compression > Flashcards

Chapter 27 Air Compression Flashcards

1
Q
  1. A connecting rod in a double-acting compressor has:
    A. Linear travel at one end and angular at the other
    B. Angular travel at both ends
    C. Angular travel at the piston end
    D. Linear travel at the crankshaft end
    E. Linear travel at both ends
A

A. Linear travel at one end and angular at the other

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2
Q 
2.	One of the categories of air compressors is the \_\_\_\_\_ type.
A.	Dynamic
B.	Rotary lobe
C.	Rotary screw
D.	Centrifugal
E.	Reciprocating
A

A. Dynamic

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3
Q 
3.	One of the categories of air compressors is the \_\_\_\_\_ type.
A.	Reciprocating
B.	Rotary lobe
C.	Rotary screw
D.	Centrifugal
E.	Positive displacement
A

E. Positive displacement

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4
Q 
4.	One of the categories of air compressors is the \_\_\_\_\_ type.
A.	Dynamic 
B.	Rotary lobe
C.	Rotary screw
D.	Centrifugal
E.	Reciprocating
A

A. Dynamic

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5
Q 
5.	The rotary screw compressor is suitable for speeds up to:
A.	3000 r/min
B.	5000 r/min
C.	8000 r/min
D.	10 000 r/min
E.	12 000 r/mi
A

E. 12 000 r/mi

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6
Q 
6.	The sliding vane compressor may have a discharge pressure as high as:
A.	3000 kPa (435 psi)
B.	1000 kPa (145 psi)
C.	5000 kPa (725 psi)
D.	2000 kPa (290 psi)
E.	4000 kPa (580 psi)
A

B. 1000 kPa (145 psi)

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7
Q
  1. A piston rod in a double-acting compressor has:
    A. Linear travel at one end and angular at the other
    B. Angular travel at both ends
    C. Angular travel at one end only
    D. Linear travel at one end only
    E. Linear travel at both ends
A

E. Linear travel at both ends

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8
Q
  1. In a double-acting type of reciprocating compressor:
    A. Compression takes place after discharge
    B. Compression takes place at one end and discharge at the other
    C. Compression and discharge take place at one end of the cylinder only
    D. Compression and discharge take place at both ends of the cylinder
    E. There is one compression strokes per revolution of the crankshaft
A

D. Compression and discharge take place at both ends of the cylinder

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9
Q 
9.	Generally, positive displacement compressors favor:
A.	Pressure
B.	Volume
C.	Temperature
D.	Time
E.	Speed
A

A. Pressure

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10
Q
  1. Since the compressors two rotating lobes do not make contact with each other:
    A. Lubrication is not required and the unit is termed “oil free”
    B. Oil is required to complete the seal for compression
    C. Efficiency is quite low due to blow-by
    D. Very high rotational speeds are required
    E. Compression is very high
A

A. Lubrication is not required and the unit is termed “oil free”

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11
Q
  1. Some uses of compressed air in buildings include all of the following except:
    A. Extinguishing fires in buildings.
    B. Operating building environmental control systems
    C. Starting engines
    D. Atomizing fuel oil
    E. Mixing or agitating in water treatment processes
A

A. Extinguishing fires in buildings.

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12
Q
  1. Some uses of compressed air in buildings include all of the following except:
    A. Operating tools
    B. Cleaning and sanitizing
    C. Spray painting
    D. Operating fire protection equipment
    E. Blast cleaning or sandblasting surfaces
A

B. Cleaning and sanitizing

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13
Q 
13.	Internal lubrication of the compressor refers to lubrication of all of the following except the:
A.	Cylinder walls
B.	Crankshaft bearings
C.	Pistons
D.	Vanes
E.	Casings of the applicable compressor
A

B. Crankshaft bearings

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14
Q
  1. The rotary screw compressor features two intermeshing rotors contained within a close-fitting casing the:
    A. Male rotor is usually the driven one
    B. Female rotor has six concave flutes
    C. Rotors do not come in contact with each other so internal lubrication is not required.
    D. Male rotor has four concave lobes
    E. Female rotor is driven by means of timing gears
A

D. Male rotor has four concave lobes

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15
Q
  1. A rotary lobe compressor has _____ within a casing.
    A. Two figure-eight shaped impellers revolving in the same direction
    B. Two figure-six shaped impellers revolving in opposite directions
    C. Two figure-six shaped impellers revolving in the same direction
    D. Two figure-eight shaped impellers revolving in opposite directions
    E. One figure-eight shaped impeller
A

D. Two figure-eight shaped impellers revolving in opposite directions

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16
Q 
16.	The temperature very exceptional circumstances may be about \_\_\_\_\_ near the end of the compression stroke. 
A.	150°C (302°F)
B.	175°C (347°F)
C.	90°C (194°F)
D.	225°C (437°F)
E.	75°C (167°F
A

D. 225°C (437°F)

17
Q 
17.	When the adsorbent becomes saturated it is reactivated by taking the bed out of operation and heating it to about \_\_\_\_\_ driving the adsorbed moisture off by evaporation. 
A.	100°C (212°F)
B.	250°C (482°F)
C.	200°C (392°F)
D.	150°C (302°F)
E.	50°C (122°F)
A

D. 150°C (302°F)

18
Q
  1. The impellers of a rotary lobe compressor maintain their relative positions with each other by the use of:
    A. Both gears are driven directly
    B. Both gears are driven by means of the timing gears
    C. One impeller drives the other by means of the timing gear
    D. One impeller is driven by the other
    E. Timing gears; one impeller is driven directly and the other by means of the timing gears
A

E. Timing gears; one impeller is driven directly and the other by means of the timing gears

19
Q
  1. Which of the following statements about centrifugal compressor advantages is incorrect?
    A. They are commonly used for large volume applications
    B. They are commonly used for low-pressure applications
    C. They are of simple and rugged construction
    D. They have low maintenance requirements
    E. Their efficiency is higher than the positive displacement type
A

E. Their efficiency is higher than the positive displacement type

20
Q 
20.	The temperature of under normal conditions will be about \_\_\_\_\_ near the end of the compression stroke.
A.	225°C (437°F)
B.	175°C (347°F)
C.	90°C (194°F)
D.	150°C (302°F)
E.	75°C (167°F)
A

C. 90°C (194°F)

21
Q
  1. A disadvantage of the sliding vane compressor is that it:
    A. Does not require inlet or discharge valves
    B. Has a lower initial cost
    C. Is less efficient than the reciprocating compressor
    D. Produces a steadier flow of air
    E. Has low starting torque requirements
A

C. Is less efficient than the reciprocating compressor

22
Q
  1. A rotary lobe compressor has _____ within a casing.
    A. Two figure-eight shaped impellers revolving in the same direction
    B. Two figure-six shaped impellers revolving in opposite directions
    C. Two figure-six shaped impellers revolving in the same direction
    D. Two figure-eight shaped impellers revolving in opposite directions
    E. One figure-eight shaped impeller
A

D. Two figure-eight shaped impellers revolving in opposite directions

23
Q
  1. Which of the following statements about centrifugal compressor advantages is incorrect?
    A. They are commonly used for large volume applications
    B. They are commonly used for low-pressure applications
    C. They are of simple and rugged construction
    D. They have low maintenance requirements
    E. Their efficiency is higher than the positive displacement type
A

E. Their efficiency is higher than the positive displacement type

24
Q 
24.	Lubricating oil is necessary in an air compressor to perform the following functions except:
A.	To prevent wear
B.	To reduce friction
C.	To remove heat
D.	To reduce corrosion
E.	To provide seating
A

E. To provide seating

25
Q 
25.	An example of a dynamic compressor is the \_\_\_\_\_ compressor.
A.	Sliding vane
B.	Rotary lobe
C.	Rotary screw
D.	Centrifugal
E.	Reciprocating
A

D. Centrifugal

26
Q 
26.	The single-stage rotary screw compressor will develop discharge pressures to about:
A.	400 kPa (58 psi)
B.	200 kPa (29 psi)
C.	100 kPa (14.5 psi)
D.	500 kPa (72.5 psi)
E.	600 kPa (87 psi)
A

A. 400 kPa (58 psi)

27
Q 
27.	The sliding vane compressor operates at speeds of up to:
A.	3000 r/min
B.	1000 r/min
C.	5000 r/min
D.	2000 r/min
E.	4000 r/min
A

A. 3000 r/min

28
Q 
28.	An air receiver is a pressure vessel their specifications must conform to the:
A.	ASME Code, Section VI
B.	ASME Code, Section IV
C.	ASME Code, Section III
D.	ASME Code, Section VIII
E.	ASME Code, Section I
A

D. ASME Code, Section VIII

Book 2 PanGlobal Assessment Test (40 decks)

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