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VIU PWR ENG Part B > Pumps and Compressors > Flashcards

Pumps and Compressors Flashcards

1
Q 
A diffuser pump:
Select one:
a. Does not have a volute
b. Does not have to be primed
c. Has high suction lift
d. is more effective at changing velocity to pressure than a volute pump
A

d. is more effective at changing velocity to pressure than a volute pump

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2
Q 
The compressor that would favour volume over pressure would be the:
Select one:
a. Rotary lobe
b. Screw
c. Centrifugal 
d. Sliding vane
A

c. Centrifugal

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3
Q

An air receiver used in an air compression system :
Select one:
a. Reduces the energy required to compress air
b. Eliminates pulsation in discharge lines
c. Controls the temperature of the air before it enters the system
d. Eliminates moisture from the air

A

b. Eliminates pulsation in discharge lines

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4
Q 
Wear rings are usually constructed of:
Select one:
a. Ceramics or aluminum
b. Graphite or bronze
c. Bronze or cast iron 
d. Steel or alloy steel
A

c. Bronze or cast iron

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5
Q

A pump is capable of suction lift due to:
Select one:
a. Its ability to convert kinetic energy into potential energy
b. The speed at which it operates
c. Its input power
d. Atmospheric pressure

A

a. Its ability to convert kinetic energy into potential energy

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6
Q

If an electric motor’s rotational speed is too high for a given compressor, what may be done?

Select one:

a. use reduction gears
b. use a variable speed drive
c. use a speed limiter
d. use compressor unloading

A

a. use reduction gears

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7
Q 
Air receivers must have a:
Select one:
a. Gauge glass
b. Thermometer
c. High pressure alarm
d. Safety valve
A

d. Safety valve

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8
Q

A inspection of a pump that is in operation should include:
Select one:
a. Ensuring water flows freely from the packing
b. Ensuring water drips from the mechanical seals
c. Checking that the suction and discharge pressures are correct
d. Re-priming the pump.

A

c. Checking that the suction and discharge pressures are correct

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9
Q

Centrifugal pumps do not develop good suction lift because:
Select one:
a. Atmospheric pressure is usually too low
b. Their internal component clearances are too high
c. The speed is too low
d. They favour pressure rather than volume

A

b. Their internal component clearances are too high

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10
Q 
Shaft misalignment during operation of a pump can be caused by bearing wear, thermal expansion and:
Select one:
a. Shaft flexing 
b. Overloading the pump
c. Loss of lubrication
d. Improper installation
A

a. Shaft flexing

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11
Q

It is generally accurate to say that:
Select one:
a. 9.8 kPa pressure results from every metre of water depth or height
b. A water height or depth of 10.34 metre results in 1 kPa
c. 10.21 kPa will result from 1 metre of static water head
d. 1 kPa will result from a water head of 9.8 m

A

a. 9.8 kPa pressure results from every metre of water depth or height

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12
Q 
A rotary pump:
Select one:
a. Is silent in operation
b. Has severe discharge pulsations
c. Should be equipped with a relief valve 
d. Is a dynamic pump
A

c. Should be equipped with a relief valve

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13
Q 
Flexible couplings will compensate for:
Select one:
a. Overheating of packing 
b. unavoidable shaft misalignment  
c. Bearing failure 
d. Impeller imbalance
A

b. unavoidable shaft misalignment

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14
Q 
Consider a pump that delivers liquid into the base of an overhead storage tank, from a reservoir situated below the pump. The vertical distance from the liquid surface up to the pump center line plus the vertical distance from the pump center line up to the surface of the liquid in the discharge tank is:
Select one:
a. Static discharge head
b. Static suction head
c. Total discharge head 
d. Total static head
A

d. Total static head

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15
Q

The seal cage on the shaft of a centrifugal pump:
Select one:
a. Holds the shaft packing against the shoulder of the stuffing box
b. Assists in reducing shaft vibration
c. Distributes sealing fluid to the stuffing box
d. Prevents fluid from leaking out of the pump casing

A

c. Distributes sealing fluid to the stuffing box

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16
Q 
The capacity of a centrifugal pump should only be reduced by:
Select one:
a. Throttling the suction valve 
b. Closing the suction valve
c. Opening the pump casing vent valve
d. Throttling the discharge valve
A

d. Throttling the discharge valve

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17
Q 
When a reciprocating pump delivers fluid every second stroke of its piston, it is called a \_\_\_\_\_\_\_\_\_\_\_ pump:
Select one:
a. Positive displacement
b. Single acting 
c. Two-stage
d. Double acting
A

b. Single acting

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18
Q 
Intercoolers should be equipped with:
Select one:
a. Moisture separators
b. Safety valves 
c. Baffles
d. Automatic blow downs
A

b. Safety valves

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19
Q 
An air compressor may be automatically started and stopped by a pressure switch, which is usually found connected to the:
Select one:
a. Intercooler
b. Aftercooler
c. Receiver 
d. Control panel
A

c. Receiver

20
Q 
When a pump discharges into a vessel operating at 300 kPa, the 300 kPa is referred to as:
Select one:
a. Dynamic head
b. Pressure head 
c. Discharge head
d. Friction head
A

b. Pressure head

21
Q

Lantern rings:
Select one:
a. Must be greased regularly
b. Prevent liquid leakage from the pump
c. Provide a seal to prevent air from entering the pump
d. Are mostly used on submerged centrifugal pumps

A

c. Provide a seal to prevent air from entering the pump

22
Q 
Wear rings in centrifugal pumps:
Select one:
a. Are non-replaceable.
b. Are installed on impellers
c. Compensate for misalignment of the impeller 
d. Are only found on high pressure pumps
A

b. Are installed on impellers

23
Q

Pump priming is:
Select one:
a. Done to centrifugal pumps with positive suction head
b. Done with the suction valve open
c. Filling the pump with gas
d. Done with the suction and discharge valve closed

A

b. Done with the suction valve open

24
Q

A inspection of a pump that is in operation should include:
Select one:
a. Ensuring water flows freely from the packing
b. Ensuring water drips from the mechanical seals
c. Checking that the suction and discharge pressures are correct
d. Re-priming the pump.

A

c. Checking that the suction and discharge pressures are correct

25
Q 
Compressed air tools tend to be:
Select one:
a. Heavier than equivalent electrical tools
b. Damaged by overloading
c. Hot after prolonged operation
d. More expensive than electrical tools
A

d. More expensive than electrical tools

26
Q 
Rotary pumps:
Select one:
a. Are low-pressure pumps
b. Must be primed before each use
c. Are positive displacement pumps 
d. Must use mechanical seals
A

c. Are positive displacement pumps

27
Q

A volute type pump:
Select one:
a. Is a positive displacement pump
b. Has a spiral casing with an increasing cross sectional area.
c. Reduces the velocity in the discharge nozzle
d. Is a regenerative type pump

A

b. Has a spiral casing with an increasing cross sectional area.

28
Q

Proper priming and venting of a pump is important, especially if:
Select one:
a. The medium being pumped is high temperature
b. The medium being pumped contains suspended solids
c. A mechanical seal is used
d. The pump has a stuffing box and lantern ring

A

c. A mechanical seal is used

29
Q

The purpose of shaft sealing on a pump is to:
Select one:
a. Keep air in the pump
b. Keep the packing gland cool
c. Reduce fluids from leaking along the pump shaft
d. Prevent lubricating oil from leaving the pump

A

c. Reduce fluids from leaking along the pump shaft

30
Q 
When a reciprocating pump delivers fluid every second stroke of its piston, it is called a \_\_\_\_\_\_\_\_\_\_\_ pump:
Select one:
a. Positive displacement
b. Single acting 
c. Two-stage
d. Double acting
A

b. Single acting

31
Q 
A rotary pump:
Select one:
a. Is silent in operation
b. Has severe discharge pulsations
c. Should be equipped with a relief valve
d. Is a dynamic pump
A

c. Should be equipped with a relief valve

32
Q 
Another name for a lantern ring, used in a pump is:
Select one:
a. Packing box
b. Packing ring
c. Rotating seal
d. Seal cage
A

d. Seal cage

33
Q

Positive displacement compressors:
Select one:
a. Cannot deliver pulsation-free air
b. Must have suction and discharge valves
c. Must all use internal lubrication
d. Could be single stage with three cylinders

A

d. Could be single stage with three cylinders

34
Q 
A speed-increasing gear is commonly used on:
Select one:
a. Rotary lobe compressors 
b. Screw compressors
c. Sliding vane compressors
d. Lobe compressors
A

b. Screw compressors

35
Q 
When a pump discharges into a vessel operating at 300 kPa, the 300 kPa is referred to as:
Select one:
a. Dynamic head
b. Pressure head 
c. Discharge head
d. Friction head
A

b. Pressure head

36
Q

Centrifugal compressors:
Select one:
a. Are used for high pressure and low flow
b. Could be of the multi-stage type
c. Must have a safety valve on the discharge when steam driven
d. Require inlet and discharge valves

A

b. Could be of the multi-stage type

37
Q

Centrifugal pumps do not develop good suction lift because:
Select one:
a. Atmospheric pressure is usually too low
b. Their internal component clearances are too high
c. The speed is too low
d. They favour pressure rather than volume

A

b. Their internal component clearances are too high

38
Q 
New pump packing should be installed:
Select one:
a. Tight enough to stop leakage
b. Loose enough to allow leakage for lubrication 
c. Every shut down
d. Every time prior to start up
A

b. Loose enough to allow leakage for lubrication

39
Q

In order to protect the drive motor, a start-stop air compressor should be equipped with:
Select one:
a. Variable speed control
b. Constant speed control
c. Safety heads
d. A speed-sensitive automatic cylinder unloader

A

d. A speed-sensitive automatic cylinder unloader

40
Q

The cooling water for an air compressor should be turned on:
Select one:
a. When the compressor reaches operating temperature
b. After starting the compressor
c. When the operating pressure is reached
d. Before starting the compressor

A

d. Before starting the compressor

41
Q 
Pump wear rings are installed on an impeller by threading, or:
Select one:
a. Shrinking
b. Welding
c. Brazing 
d. Forging
A

a. Shrinking

42
Q

The seal cage on the shaft of a centrifugal pump:
Select one:
a. Holds the shaft packing against the shoulder of the stuffing box
b. Assists in reducing shaft vibration
c. Distributes sealing fluid to the stuffing box
d. Prevents fluid from leaking out of the pump casing

A

c. Distributes sealing fluid to the stuffing box

43
Q

Which of the following air compressors gives two compression strokes per crankshaft revolution?
Select one:
a. Two-stage two cylinder double-acting compressor
b. A two-stroke compressor
c. Single cylinder double acting compressor
d. Two cylinder single stage double acting compressor

A

c. Single cylinder double acting compressor

44
Q 
The name given to the category of pumps that use gear teeth, vanes, or lobes to move the fluid being pumped is the \_\_\_\_\_ type.
Select one:
a. Axial flow
b. Radial flow
c. Dynamic 
d. Rotary
A

d. Rotary

45
Q 
The capacity of a centrifugal pump should only be reduced by:
Select one:
a. Throttling the suction valve 
b. Closing the suction valve
c. Opening the pump casing vent valve
d. Throttling the discharge valve
A

d. Throttling the discharge valve

46
Q 
An advantage of a pump using a mechanical seal is:
Select one:
a. Lower first cost
b. Less maintenance
c. Less lubrication 
d. Ease of repair
A

b. Less maintenance

VIU PWR ENG Part B (18 decks)

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