Power Engineering - 4B2 Practice
Questions
When a reciprocating pump delivers fluid every second stroke of its piston, it is
called a ___________ pump:
a. Positive displacement
b. Single acting
c. Two-stage
d. Double acting
When a pump discharges into a vessel operating at 300 kPa, the 300 kPa is
referred to as:
a. Dynamic head
b. Pressure head
c. Discharge head
d. Friction head
A reciprocating air compressor works on the principle of:
a. Pressure reduction
b. Centrifugal force
c. Volumetric expansion
d. Volume reduction
A volute type pump:
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 diffuser pump:
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
, Positive displacement compressors:
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
Compressed air tools tend to be:
a. Heavier than equivalent electrical tools
b. Damaged by overloading
c. Hot after prolonged operation
d. More expensive than electrical tools
The compressor that would favour volume over pressure would be the:
a. Rotary lobe
b. Screw
c. Centrifugal
d. Sliding vane
Which type of pump produces the greatest suction?
a. A volute centrifugal pump
b. A centrifugal pump
c. A regenerative pump
d. A positive displacement pump
Which of the following air compressors gives two compression strokes per
crankshaft revolution?
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
In a centrifugal compressor the kinetic energy is converted to potential energy in
the:
a. Volute, diffuser or both
b. Diffuser only
c. Compressor cavity
d. Volute only
A double-acting pump:
Questions
When a reciprocating pump delivers fluid every second stroke of its piston, it is
called a ___________ pump:
a. Positive displacement
b. Single acting
c. Two-stage
d. Double acting
When a pump discharges into a vessel operating at 300 kPa, the 300 kPa is
referred to as:
a. Dynamic head
b. Pressure head
c. Discharge head
d. Friction head
A reciprocating air compressor works on the principle of:
a. Pressure reduction
b. Centrifugal force
c. Volumetric expansion
d. Volume reduction
A volute type pump:
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 diffuser pump:
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
, Positive displacement compressors:
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
Compressed air tools tend to be:
a. Heavier than equivalent electrical tools
b. Damaged by overloading
c. Hot after prolonged operation
d. More expensive than electrical tools
The compressor that would favour volume over pressure would be the:
a. Rotary lobe
b. Screw
c. Centrifugal
d. Sliding vane
Which type of pump produces the greatest suction?
a. A volute centrifugal pump
b. A centrifugal pump
c. A regenerative pump
d. A positive displacement pump
Which of the following air compressors gives two compression strokes per
crankshaft revolution?
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
In a centrifugal compressor the kinetic energy is converted to potential energy in
the:
a. Volute, diffuser or both
b. Diffuser only
c. Compressor cavity
d. Volute only
A double-acting pump:
