(4-073-2.8) Which type of pump produces the greatest suction?
Select one:
a. A volute centrifugal pump
b. A centrifugal pump
c. A regenerative
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d. A positive displacement pump - ✔✔ D
(4-073-2.1) 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 - ✔✔ C
(4-074-5.4) Priming of a centrifugal pump refers to:
Select one:
a. Removal of liquid from the pump
b. Filling the pump casing with liquid and removing the air
c. Lifting the pump
d. Closing the vent on the pump casing - ✔✔ B
(4-075-3.1) 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 - ✔✔ D
(4-074-2.1) A slight leakage is desired between the pump shaft and the packing in order to:
Select one:
a. Prevent the ingress of air
b. Prevent wearing of the wear rings
c. Lubricate the packing
d. Prevent the pump from vapour locking - ✔✔ C
(4-074-4.1) 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
(4-075-2.8) Intercoolers should be equipped with:
Select one:
a. Moisture separators
b. Safety valves
c. Baffles
d. Automatic blow downs - ✔✔ B
(4-075-1.4) 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 - ✔✔ C
(4-074-5.1) 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. - ✔✔ C
(4-073-3.8) The capacity of a centrifugal pump:
Select one:
a. Varies with discharge pressure
b. Is fixed and can only be altered by changing the impeller
c. Should be varied by suction valve manipulation
d. Can be altered by speed variation only - ✔✔ A
(4-075-2.1) An air compressor auxiliary which will decrease the power requirement is the:
Select one:
a. Receiver
b. Diffuser
c. Intercooler
d. Aftercooler - ✔✔ C
(4-075-1.9) 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 - ✔✔ B
(4-073-2.6) 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 - ✔✔ B
(4-074-1.1) 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 - ✔✔ B
(4-074-1.2) Pump wear rings are installed on an impeller by threading, or:
Select one:
a. Shrinking
b. Welding
c. Brazing
d. Forging - ✔✔ A
(4-073-3.2) Rotary pumps should be started with the discharge valve open because they are _____ pumps.
Select one:
a. Reciprocating
b. Double-acting
c. Positive displacement
d. Regenerative - ✔✔ C
(4-074-3.2) 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 - ✔✔ C
(4-074-5.5) 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 - ✔✔ B [Show Less]