3A2 Chapter 09 Flashcards
The main function of a power distribution system is to provide electrical power, for whatever need, in a safe and dependable manner
A) true
B) false
A) true
A dual supply system is one in which two independent power lines are used to _______ the same load
A) make
B) supply
C) balance
D) carry
B) supply
Under normal operation, both incoming breakers, are _____ and the tiebreaker is ______
A) closed, closed
B) open, closed
C) closed, open
D) open, open
C) closed, open
Describe kilowatt hours meter
A) this is an indication of the AC kilowatts that the generator is producing
B) this is a meter that measures and records the amount of power produced by the generator
C) this gives an indication of the DC voltage that is being supplied to the generators field windings
D) this is a measurement of the reactive power being generated by the AC generation system
B) this is a meter that measures and records the amount of power produced by the generator
Describe exciter field voltage meter
A) this is an indication of the AC kilowatts that the generator is producing
B) this is a meter that measures and records the amount of power produced by the generator
C) this gives an indication of the DC voltage that is being supplied to the generators field windings
D) this is a measurement of the reactive power being generated by the AC generation system
C) this gives an indication of the DC voltage that is being supplied to the generators field windings
Describe exciter field current meter
A) this is a meter that measures and records the amount of power produced by the generator
B) this gives an indication of the DC current that is being supplied to the generators field windings
C) this is a measurement of the reactive power being generated by the AC generator system
D) this is an indication of the AC kilowatts the generator is producing
B) this gives an indication of the DC current that is being supplied to the generators field windings
Describe AC kilovars
A) this is a meter that measures and records the amount of power produced by the generator
B) this gives an indication of the DC current that is being supplied to the generators field windings
C) this is a measurement of the reactive power being generated by the AC generator system
D) this is an indication of the AC kilowatts the generator is producing
C) this is a measurement of the reactive power being generated by the AC generator system
Describe A,B & C phases in a three phase generator
A) these are an indication of the AC current, expressed in amps, being produced by the three phase generator
B) this is a meter that measures and records the amount of power produced by the generator
C) this gives an indication of the DC voltage that is being supplied to the generators field windings
D) this is a measurement of the reactive power being generated by the AC generation system
A) these are an indication of the AC current, expressed in amps, being produced by the three phase generator
Describe the purpose of the voltage adjust
A) this is to adjust the generator output voltage
B) this is to adjust the generator excitation voltage
C) this is to adjust the generator output phase voltage
D) this is to adjust the generator output current
B) this is to adjust the generator excitation voltage
Describe the purpose of the frequency meter:
A) this is a meter that measures and records the amount of power produced by the generator
B) this gives an indication of the DC current that is being supplied to the generators field windings
C) this is a measurement of the reactive power being generated by the AC generation system
D) this is an indication of the frequency of the power being produced. It is expressed. Hertz
D) this is an indication of the frequency of the power being produced. It is expressed. Hertz
Describe the purpose of the power factor meter
A) this is a meter to check the power factor of the generating system
B) this is a meter that measures and records the amount of power produced by the generator
C) this gives an indication of the DC voltage that is being supplied to the generators field windings
D) this is a measurement of the reactive power being generated by the AC generation system
A) this is a meter to check the power factor of the generating system
Describe the purpose of the AC voltage meter
A) this is a meter that measures and records the amount of power produced by the generator
B) this gives an indication of the DC voltage that is being supplied to the generators field windings
C) this is an indication of the AC voltage, expressed in volts, which is being produced by the three phase generator
D) this is a measurement of the reactive power being generated by the AC generation system
C) this is an indication of the AC voltage, expressed in volts, which is being produced by the three phase generator
Describe the purpose of the AC kilovars meter
A) this is a measurement of the reactive power being generated by the AC generation system
B) this gives an indication of the DC voltage that is being supplied to the generators field windings
C) this is an indication of the AC voltage, expressed in volts, which is being produced by the three phase generator
D) this is a measurement of the reactive power being generated by the AC generation system
A) this is a measurement of the reactive power being generated by the AC generation system
Describe the purpose of the voltmeter selector
A) this is to adjust the generator output voltage
B) this is to adjust the generator excitation voltage
C) this is used to check and verify the voltage on each phase of the generator
D) this is to adjust the generator output phase voltage
C) this is used to check and verify the voltage on each phase of the generator
The fuse link is so sized that the heat created by the normal flow of voltage through it is not sufficient to fuse or melt the metal
A) true
B) false
B) false
Cartridge fuses are used on circuits with voltage ratings up to _____ volts, the standard voltage ratings of these fuses being _____ and ______ volts
A) 110,50,110
B) 600,250,600
C) 24,5,24
D) 110,220,110
B) 600,250,600
Time lag fuses have two parts, a ______ cutout part and a ______ link
A) timer, reset
B) metal, powder
C) thermal, fuse
D) voltage, amp
C) thermal, fuse
What is a safety switch device used for?
A) protection of low current flow
B) detecting the voltage of circuit
C) current flow indication
D) isolating parts of an electric circuit
D) isolating parts of an electric circuit
A circuit breaker is an automatic device that ______
A) indicates circuit status
B) opens under abnormally high current conditions
C) provides a current junction box
D) both A/B
D) both A/B
Relay systems may cause circuit breakers to open due to changes in _____,_____ or _____
A) voltage, amperage, resistance
B) frequency, voltage, current
C) power factor, impedance, resistance
D) resistance, conductance, reluctance
B) frequency, voltage, current
When a _____ generator loses excitation, the rotor accelerates and it operates as an induction generator, running above ____ speed
A) three phase, rated
B) synchronous, synchronous
C) AC, governor
D) DC, generator
B) synchronous, synchronous
Over excitation most often occurs:
1) during startup / shutdown
2) operating at a reduced frequency
3) complete load rejection
4) a failure in the excitation system
A) 1,2
B) 1,2,3
C) 1,2,3,4
D) 4
C) 1,2,3,4
Generator over voltage may occur during:
1) load rejection
2) high generator speed
3) low frequency
4) excitation control failure
A) 1,2,3
B) 1,2,3,4
C) 1,4
D) 4
C) 1,4
If a dead generator is accidentally energized, while on turning gear, it will start and behave as an ______ ______
A) AC generator
B) DC generator
C) induction motor
D) prime mover
C) induction motor
Excess power results in an _____ _____ condition with a possible overvoltage from reduced lad demands
A) under frequency
B) over frequency
C) surge like
D) over excitation
B) over frequency
A second stator ground fault will cause extensive damage by:
1) shorting out parts of the field winding
2) causing high unit vibrations
3) causing rotor heating from unbalanced currents
4) arc damage at the points of the fault
5) no real damage at all
6) cause the generator to produce single phase power
A) 1,2,3
B) 1,2,3,4,5
C) 1,2,3,4,5,6
D) 4,5,6
A) 1,2,3
An uninterruptible power supply is required for plant systems that cannot tolerate a momentary loss of _____ and / or ______
A) power, lights
B) current, voltage
C) production, down time
D) voltage, frequency
D) voltage, frequency
Consider all circuits to be alive unless one is certain that they are ______ and cannot, by she human error, be made _____
A) isolated, connected
B) dead, live
C) not, open
D) 220 V, 110 V
B) dead, live
An operator must isolate all equipment, such as pumps, before maintenance is started. All switches must be locked open, at the source of power
A) true
B) false
A) true
List sequence of events for equipment isolation
A) consider all circuits to be alive unless one is certain they are dead and cannot, by some human error, be made live
B) place tags that show equipment is out of service for maintenance when opening an electrical circuit. The tag should bear the name of the person who put it there and should only be removed by this person and the switch reclosed by that person. An operator should isolate all equipment, such as pumps, before maintenance is started
C) all switches should be locked open, at the source of power
D) test the equipment, after isolation, by attempting to start it at the start /stop station. The circuit may be open but charged capacitors can injure a person. Always open switches completely befe removing fuses
E) if it is necessary to change a fuse n a live circuit, use approved fuse pullers that can withstand the line voltage
F) when removing fuses of live circuits, break contact with the lime side first. Make contact with the line side first when inserting a new fuse
G) switches should be opened in a firm, positive manner to prevent arcing
A) a,b,c,d,e,f,g
B) f,g,e,a,b,c,d
C) a,g,c,d,b,e,f
D) a,g,c,b,e,d,f
C) a,g,c,d,b,e,f
