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3A2 > Chapter 9: AC Systems, Switchgear, and Safety > Flashcards

Chapter 9: AC Systems, Switchgear, and Safety Flashcards

1
Q

A circuit breaker is an automatic device that:
Select one:

a.
Indicates line voltage

b.
Opens under abnormally high current conditions

c.
Provides a circuit junction box

d.
Is used to switch power on and off

e.
Indicates line amperage

A

b.
Opens under abnormally high current conditions

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2
Q

Time delay fuses have two parts: a _____ cut-out part and a _____ link.
Select one:

a.
Timer, reset

b.
Metal, powder

c.
Thermal, fuse

d.
Voltage, ampere

e.
Timer, fuse

A

c.
Thermal, fuse

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3
Q

In an uninterruptible power supply system, the rectifier converts 600V, three-phase AC power to 120V DC, which provides power to charge the _____ and also supply the _____.
Select one:

a.
Batteries, inverter

b.
UPS, UPS

c.
Capacitors, emergency bus

d.
Circuits, control room

e.
Capacitors, inverter

A

a.
Batteries, inverter

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4
Q

An inverter converts the _____ (for critical plant power users) to maintain a supply of stable voltage and frequency output power.
Select one:

a.
DC power to single-phase AC

b.
DC power to three-phase AC

c.
AC power to single-phase DC

d.
AC power to three-phase DC

e.
Three-phase DC power to single-phase AC

A

a.
DC power to single-phase AC

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5
Q

A person should consider all electrical circuits to be alive unless certain that they are _____ and cannot, by some human error, be made _____.
Select one:

A.
Isolated, connected

B.
Dead, live

C.
Not, open

D.
220 V, 110 V

E.
Live, dead

A

B.
Dead, live

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6
Q

The purpose of the power factor meter is to:
Select one:

a.
Measure the inductive power being generated by the AC generation system

b.
Measure and record the amount of power produced by the generator

c.
Indicate the DC voltage that is being supplied to the generator’s field windings

d.
Measure the reactive power being generated by the AC generation system.

e.
Indicate the power factor of the generating system.

A

e.
Indicate the power factor of the generating system.

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7
Q

In an uninterruptible power supply system, the inverter converts the _____ (for critical plant power users) to maintain an output power supply with stable voltage and frequency.
Select one:

a.
DC power to single-phase AC

b.
DC power to three-phase AC

c.
AC power to single-phase DC

d.
AC power to three-phase DC

e.
Three-phase DC power to single-phase AC

A

a.
DC power to single-phase AC

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8
Q

The exciter field current meter can be described as:
Select one:

a.
A meter that measures and records the amount of power produced by the generator

b.
A measurement of the reactive power that is generated by the AC generation system

c.
An indicator of the AC kilowatts the generator is producing

d.
A measurement of the inductive power that is generated by the AC generation system

e.
Giving an indication of the DC current that is being supplied to the generator’s field windings

A

e.
Giving an indication of the DC current that is being supplied to the generator’s field windings

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9
Q

An operator must isolate all equipment, such as pumps, before maintenance is started. All switches must be _____ at the source of the power at the breaker.
Select one:

A.
Locked open

B.
Locked closed

C.
Disconnected

D.
Tagged closed

E.
Checked open

A

A.
Locked open

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10
Q

The purpose of the frequency meter is to:
Select one:

a.
Measure and record the amount of power produced by the generator

b.
Give an indication of the DC current that is being supplied to the generator’s field windings

c.
Indicate the frequency of the power being produced

d.
Measure the reactive power being generated by the AC generation system.

e.
Indicate the voltage of the power being produced

A

c.
Indicate the frequency of the power being produced

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11
Q

Cartridge fuses are used on circuits with voltage ratings up to _____ volts. The standard voltage ratings of these fuses are _____ and _____ volts.
Select one:

a.
110, 50, 110

b.
220, 110, 220

c.
24, 5, 24

d.
110, 220, 110

e.
600, 250, 600

A

e.
600, 250, 600

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12
Q

A dual supply system is one in which two independent power lines are used to _____ the same load.
Select one:

a.
Make

b.
Supply

c.
Balance

d.
Carry

e.
Distribute

A

b.
Supply

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13
Q

If a/an _____ generator loses excitation, the rotor accelerates and it operates as an induction generator, running above _____ speed.
Select one:

a.
Three-phase, rated

b.
Synchronous, synchronous

c.
AC, governor

d.
DC, generator

e.
AC, synchronous

A

b.
Synchronous, synchronous

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14
Q

Excess power results in a/an _____ condition with a possible overvoltage from reduced load demands.
Select one:

a.
Under frequency

b.
Over frequency

c.
Surge-like

d.
Overexcitation

e.
Over voltage

A

b.
Over frequency

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15
Q

The exciter field voltage 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 generator’s 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

A

c.
Giving an indication of the DC voltage that is being supplied to the generator’s field windings

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16
Q

The purpose of the AC kilo-VAR meter is to:
Select one:

A.
Indicate the DC voltage that is being supplied to the generator’s field windings

B.
Indicate the AC voltage that is being produced by the three-phase generator

C.
Indicate the DC current that is being supplied to the generator’s field windings

D.
Indicate the AC current that is being produced by the three-phase generator

E.
Indicate the reactive power being generated by the AC generation system

A

E.
Indicate the reactive power being generated by the AC generation system

17
Q

A fuse link is sized so that the _____ the normal flow of current through it is not sufficient to fuse or melt the metal.
Select one:

a.
Voltage due to

b.
Resistance due to

c.
Heat created by

d.
Capacitance created by

e.
Inductance created by

A

c.
Heat created by

18
Q

The purpose of the AC volt meter is to:
Select one:

A.
Measure and record the amount of power produced by the generator

B.
Indicate the DC voltage that is being supplied to the generator’s field windings

C.
Indication of the AC voltage, expressed in volts, which is being produced by the three-phase generator

D.
Measure the reactive power being generated by the AC generation system

E.
Measure the inductive power being generated by the AC generation system

A

C.
Indication of the AC voltage, expressed in volts, which is being produced by the three-phase generator

19
Q

A2C09Q01 Arc flash clothing is rated by an __________ (ATPV) or energy of break-open threshold (EBT).
Select one:

a.
Arc thermal performance variable

b.
Arc temperature performance variable

c.
Arc thermal performance value

d.
Arc thermal protection value

A

c.
Arc thermal performance value

20
Q

Overexcitation most often occurs:
1. During start-up/shutdown
2. When operating at reduced frequency
3. In conjunction with a complete load rejection
4. During a failure in the excitation system
Select one:

a.
1, 2

b.
1, 2, 3

c.
2, 3, 4

d.
1, 3, 4

e.
1, 2, 3, 4

A

e.
1, 2, 3, 4

21
Q

An AC kilowatt meter can be described as:
Select one:

a.
A meter that measures and records the amount of power produced by the generator

b.
Giving an indication of the DC current that is being supplied to the generators field windings

c.
A measurement of the reactive power that is generated by the AC generation system

d.
A measurement of the inductive power that is generated by the AC generation system

e.
An indicator of the AC kilowatts that the generator is producing

A

e.
An indicator of the AC kilowatts that the generator is producing

22
Q

An uninterruptible power supply is required for plant systems that cannot tolerate a momentary loss of _____ and/or _____.
Select one:

a.
Power, lights

b.
Current, voltage

c.
Voltage, frequency

d.
Bells, whistles

e.
Production, downtime

A

c.
Voltage, frequency

23
Q

The purpose of the voltmeter selector is to:
Select one:

a.
Indicate the AC current that is being produced by the three-phase generator

b.
Adjust the generator excitation voltage

c.
Check and verify the voltage on each phase of the generator.

d.
Adjust the generator output phase voltage

e.
Adjust the generator output voltage

A

c.
Check and verify the voltage on each phase of the generator.

24
Q

If a dead generator is accidentally energized, while on turning gear, it will start and behave as a/an:
Select one:

A.
AC generator

B.
DC generator

C.
Prime mover

D.
DC motor

E.
Induction motor

A

E.
Induction motor

25
Q

A safety switch is a device for:
Select one:

a.
Protection of low current flow

b.
Detecting the voltage of circuit

c.
Current flow indication

d.
Isolating parts of an electric circuit

e.
Protection of high current flow

A

d.
Isolating parts of an electric circuit

26
Q

The purpose of the voltage adjustment is to adjust the generator:
Select one:

a.
Output voltage

b.
Excitation voltage

c.
Output phase voltage

d.
Output current

e.
Excitation current

A

b.
Excitation voltage

27
Q

The exciter field current meter can be described as:
Select one:

a.
A meter that measures and records the amount of power produced by the generator

b.
A measurement of the reactive power that is generated by the AC generation system

c.
An indicator of the AC kilowatts the generator is producing

d.
A measurement of the inductive power that is generated by the AC generation system

e.
Giving an indication of the DC current that is being supplied to the generator’s field windings

A

e.
Giving an indication of the DC current that is being supplied to the generator’s field windings

28
Q

Overexcitation most often occurs:
1. During start-up/shutdown
2. When operating at reduced frequency
3. In conjunction with a complete load rejection
4. During a failure in the excitation system
Select one:

a.
1, 2

b.
1, 2, 3

c.
2, 3, 4

d.
1, 3, 4

e.
1, 2, 3, 4

A

e.
1, 2, 3, 4

29
Q

Cartridge fuses are used on circuits with voltage ratings up to _____ volts. The standard voltage ratings of these fuses are _____ and _____ volts.
Select one:

a.
110, 50, 110

b.
220, 110, 220

c.
24, 5, 24

d.
110, 220, 110

e.
600, 250, 600

A

e.
600, 250, 600

30
Q

The purpose of the frequency meter is to:
Select one:

a.
Measure and record the amount of power produced by the generator

b.
Give an indication of the DC current that is being supplied to the generator’s field windings

c.
Indicate the frequency of the power being produced

d.
Measure the reactive power being generated by the AC generation system.

e.
Indicate the voltage of the power being produced

A

c.
Indicate the frequency of the power being produced

3A2 (17 decks)

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