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NERC RC > NERC PRACTICE SET 1 > Flashcards

NERC PRACTICE SET 1 Flashcards

1
Q

A transformer has a .8 or 80% power factor and has 150 MW flowing out on its high
side. How many MWs are flowing into the low side?
a. 187.5 MW
b. 150 MW
c. 120 MW
d. 37.5 MW

A

b. 150 MW

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2
Q

Your frequency bias is -100 MW / .1Hz. System frequency is 59.95. How much is your
balancing authority contributing to the Interconnection.
a. 100 MW
b. 75 MW
c. 50 MW
d. 30 MW

A

c. 50 MW

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3
Q

A fault has occurred in your power system. What will the System Operator look for?
a. A condition where a component is not in sync with the rest of the system
b. A condition that causes a device, component, or element to fail
c. A condition of abnormal electric current
d. A condition of abnormal electric current which causes protective relays to operate

A

d. A condition of abnormal electric current which causes protective relays to operate

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4
Q

What makes up spinning reserves?
a. Generators
b. Synchronous condensers
c. Capacitors
d. Reactor

A

a. Generators

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5
Q

What does I2R indicate?
a. Voltage
b. Resistance
c. Power Losses
d. Transformers

A

c. Power Losses

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6
Q

What resists an initial decline in system frequency following a disturbance?
a. Inertia
b. AGC
c. AVR
d. Frequency Bias

A

a. Inertia

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7
Q

What is the primary AGC control mode that will best indicate a Balancing Authorities
generation-load-interchange balance?
a. Generators on Auto
b. Flat Interchange control
c. Tie Line Bias
d. Constant Frequency

A

c. Tie Line Bias

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8
Q

When the total generation in an Interconnection is more than the total load, what will
the System Operator will experience?
a. Frequency below 60.00 Hz
b. Frequency above 60.00 Hz
c. Frequency at 60.00 Hz
d. Frequency scheduled change

A

b. Frequency above 60.00 Hz

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9
Q

When a transmission line is absorbing VARs from the system, which primary
characteristic is the line exhibiting?
a. Inductance
b. Capacitance
c. Resistance
d. Impedance

A

a. Inductance

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10
Q

What parameters are required to be within range to synchronize to the power system?
a. Frequency and voltage must be identical
b. Frequency, voltage, phase angle
c. Generator speed and voltage
d. Voltage and power angle

A

b. Frequency, voltage, phase angle

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11
Q

Potential Transformer and Current Transformers are used primary for which purpose?
a. Measure the potential energy
b. Step up the power flow to reduce losses
c. Monitor safety
d. Convert the measured value to a lower value for relays

A

d. Convert the measured value to a lower value for relays

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12
Q

When isolating electrical equipment, you must have a visible open point usually
provided by which device?
a. Disconnect switches
b. Circuit Breakers
c. Arresters
d. Relay protection

A

a. Disconnect switches

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13
Q

A System Operator notices voltage decreasing at key stations, what is your first action?
a. Direct generators to produce more reactive power
b. Place capacitors in service
c. Reduce Interchange
d. Re-dispatch

A

b. Place capacitors in service

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14
Q

What does power factor indicate?
a. The difference between real and reactive power
b. The difference between real and apparent power
c. The ratio between real and apparent power
d. The ratio between generation and load

A

c. The ratio between real and apparent power

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15
Q

What is the purpose of increasing voltage from generator voltages to transmission
voltages and then decreasing to customer voltages?
a. Minimize power system losses
b. Maximize power system voltage
c. Minimize power system equipment needed
d. Maximize power system customer load

A

a. Minimize power system losses

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16
Q

What is meant by a radial transmission line?
a. Loads are arranged in a radius
b. Providing power to a rural area
c. Lines that Serves load
d. Electricity delivered at a different frequency

A

c. Lines that Serves load

17
Q

When a high voltage transmission line has a net VAR flow out of the line, the line is
which of these?
a. Lightly loaded
b. Heavily loaded
c. At Surge Impedance Loading
d. Efficient

A

a. Lightly loaded

18
Q

The Power Triangle describes the relationship of these values?
a. MVA, MW, MVAR
b. MVA, Voltage, Angle
c. Power Factor
d. Power, Voltage, Current

A

a. MVA, MW, MVAR

19
Q

What does a generators governor droop setting determine?
a. The amount of change before the generator output increases
b. The percentage of change the unit will experience when frequency changes
c. The amount of response expected from your Balancing Authority
d. The percentage of 60.00 Hz that changes the output of a generator from no load to full load or vice versa

A

d. The percentage of 60.00 Hz that changes the output of a generator from no load
to full load or vice versa

20
Q

Load Shed should be considered after other actions, which situation would require load shed?
a. Voltage at .90 pu
b. Extremely high voltage
c. Not enough generation
d. Power Losses on Transmission

A

c. Not enough generation

21
Q

If a transformer rated at 100 MVA has 80 MW flowing through it. How many MVARS
could this transformer support before reaching its system operating limit?
a. 40 MVAR
b. 60 MVAR
c. 80 MVAR
d. 100 MVAR

A

b. 60 MVAR

22
Q

During system restoration, what is the impact of adding more load than generation
capability?
a. System frequency will increase
b. System frequency will drop
c. System generation will increase
d. System inertia will maintain frequency

A

b. System frequency will drop

23
Q

Which of these power system elements consumes reactive power?
a. Heavily loaded transmission lines and Motor load
b. Shunt reactors and synchronous condensers
c. Generators and capacitors
d. Lightly loaded transmission lines and lighting load

A

a. Heavily loaded transmission lines and Motor load

24
Q

Frequency reading is 59.99 Hz, when monitoring the generation, you notice frequency is
59.21 Hz at a large generating facility. What is this an indication of?
a. Generator tripped
b. Load tripped
c. Island condition
d. Bad frequency meter

A

c. Island condition

25
Q

Prior to taking out an element of the Bulk Electric System, a System Operator should
first?
a. Run a power flow study
b. Get crews in place
c. Discuss with the Reliability Coordinator
d. Increase voltage

A

a. Run a power flow study

NERC RC (5 decks)

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