Power Engineering class 3A2 – Review questions with
accurate answers
"Confined Space" means an area, other than an underground working,
that:
1. Is enclosed or partially enclosed.
2. Is designed or intended for continuous human occupancy.
3. Has limited or restricted means for entry or exit that may complicate
the provision of first aid, evacuation, rescue or other emergency
response service.
4. Is not large enough nor configured so a worker can enter to perform
assigned work.
Select one:
A. 1, 2, 3
B. 2, 3, 4
C. 1, 2, 4
D. 1, 3,
E. 1, 2, 3, 4 Ans✓✓✓ D
"Fail safe" means that the end devices will be _______ once their source
of power has been removed.
Select one:
A. Fully open
B. Fully closed
C. Manually locked
,D. Held in current position
E. Either fully open or fully closed Ans✓✓✓ E
4.16 kV emergency switching could be described as:
Select one:
A. In the event that the incoming 4.16 kV power should be lost, critical
users are supplied with 4.16 kV emergency power from the 900 kW
natural gas turbine generator.
B. In the event that the incoming utility power should be lost, critical
users are supplied with 480 V emergency power from the 250 kW diesel
generator.
C. In the event that the incoming 600 V power should be lost, critical
users are supplied with 4.16 kV emergency power from the 900 kW
natural gas turbine generator.
D. In the event that the incoming 600 V power should be lost, critical
users are supplied with 480 V emergency power from the 900 kW
natural gas turbine generator.
E. In the event that the incoming 4.16 kV power should be lost, critical
users are supplied with 480 V emergency power from the 900 kW
natural gas turbine generator. Ans✓✓✓ A
A coil with an inductance of 0.2 H is connected to a 120 V, 60 Hz
supply. Find the current flowing through the coil.
Select one:
A. 1.05 A.
B. 1.25 A.
,C. 2.0 A.
D. 1.59 A.
E. 3.0 A. Ans✓✓✓ D
A DC circuit has 12 volts and a resistance of 300 ohms. The current
flowing is:
Select one:
A. 0.4 amps.
B. 40 milliamps.
C. 400 milliamps.
D. 3600 amps.
E. 25 milliamps. Ans✓✓✓ B
A double-seated balance valve could be described as:
Select one:
A. Having a valve plug that moves inside a removable cage that holds
down a seating ring.
B. A valve body with cage-style trim, balanced plug and soft seat. It is
single-ported as only one seat ring is used.
C. Passing up to twice as much fluid as a single port valve. It generally
divides the flow in half through two control ports.
D. Having downstream pressure acts on both the top and bottom of the
valve plug, thereby equalizing most of the forces.
E. Being ideal for positive shut off service. Ans✓✓✓ C
, A gate valve consists of a gate-like _____, actuated by a screwed stem
and hand wheel, which moves up and down _____ the flow.
Select one:
A. Disc, at right angles to.
B. Stopper, within close proximity to.
C. Seal, at some distance from.
D. Device, relative to .
E. Disc, parallel to. Ans✓✓✓ A
A Kilowatt-hour meter can be described as:
Select one:
A. An indicator of the AC kilowatts that the generator is producing.
B. A meter that measures and records the amount of power produced by
the generator.
C. Giving an indication of the DC voltage that is being supplied to the
generators field windings.
D. A measurement of the reactive power being generated by the AC
generation system.
E. A measurement of the inductive power being generated by the AC
generation system. Ans✓✓✓ B
A material suitable for use as insulation should have the following
characteristics:
1. High insulating value
2. Long life
accurate answers
"Confined Space" means an area, other than an underground working,
that:
1. Is enclosed or partially enclosed.
2. Is designed or intended for continuous human occupancy.
3. Has limited or restricted means for entry or exit that may complicate
the provision of first aid, evacuation, rescue or other emergency
response service.
4. Is not large enough nor configured so a worker can enter to perform
assigned work.
Select one:
A. 1, 2, 3
B. 2, 3, 4
C. 1, 2, 4
D. 1, 3,
E. 1, 2, 3, 4 Ans✓✓✓ D
"Fail safe" means that the end devices will be _______ once their source
of power has been removed.
Select one:
A. Fully open
B. Fully closed
C. Manually locked
,D. Held in current position
E. Either fully open or fully closed Ans✓✓✓ E
4.16 kV emergency switching could be described as:
Select one:
A. In the event that the incoming 4.16 kV power should be lost, critical
users are supplied with 4.16 kV emergency power from the 900 kW
natural gas turbine generator.
B. In the event that the incoming utility power should be lost, critical
users are supplied with 480 V emergency power from the 250 kW diesel
generator.
C. In the event that the incoming 600 V power should be lost, critical
users are supplied with 4.16 kV emergency power from the 900 kW
natural gas turbine generator.
D. In the event that the incoming 600 V power should be lost, critical
users are supplied with 480 V emergency power from the 900 kW
natural gas turbine generator.
E. In the event that the incoming 4.16 kV power should be lost, critical
users are supplied with 480 V emergency power from the 900 kW
natural gas turbine generator. Ans✓✓✓ A
A coil with an inductance of 0.2 H is connected to a 120 V, 60 Hz
supply. Find the current flowing through the coil.
Select one:
A. 1.05 A.
B. 1.25 A.
,C. 2.0 A.
D. 1.59 A.
E. 3.0 A. Ans✓✓✓ D
A DC circuit has 12 volts and a resistance of 300 ohms. The current
flowing is:
Select one:
A. 0.4 amps.
B. 40 milliamps.
C. 400 milliamps.
D. 3600 amps.
E. 25 milliamps. Ans✓✓✓ B
A double-seated balance valve could be described as:
Select one:
A. Having a valve plug that moves inside a removable cage that holds
down a seating ring.
B. A valve body with cage-style trim, balanced plug and soft seat. It is
single-ported as only one seat ring is used.
C. Passing up to twice as much fluid as a single port valve. It generally
divides the flow in half through two control ports.
D. Having downstream pressure acts on both the top and bottom of the
valve plug, thereby equalizing most of the forces.
E. Being ideal for positive shut off service. Ans✓✓✓ C
, A gate valve consists of a gate-like _____, actuated by a screwed stem
and hand wheel, which moves up and down _____ the flow.
Select one:
A. Disc, at right angles to.
B. Stopper, within close proximity to.
C. Seal, at some distance from.
D. Device, relative to .
E. Disc, parallel to. Ans✓✓✓ A
A Kilowatt-hour meter can be described as:
Select one:
A. An indicator of the AC kilowatts that the generator is producing.
B. A meter that measures and records the amount of power produced by
the generator.
C. Giving an indication of the DC voltage that is being supplied to the
generators field windings.
D. A measurement of the reactive power being generated by the AC
generation system.
E. A measurement of the inductive power being generated by the AC
generation system. Ans✓✓✓ B
A material suitable for use as insulation should have the following
characteristics:
1. High insulating value
2. Long life
