NERC RANDOM QUESTIONS AND
ANSWERS 100% SOLVED
,When current in an AC circuit is doubled, power losses in the circuit will respond in
which way?
a) half as much
b) does not change
c) doubles
d) four times greater - ANSWERd) four times greater
What determines the size of insulators used on power lines?
a) Current flow on the line
b) Voltage level of the line
c) Reactance of the line
d) Operating Limit of the line - ANSWERb) Voltage level of the line
Reactive power is needed to support which type of load?
a) Inductive
b) Capacitive
c) Impedance
d) Resistive - ANSWERa) Inductive
When isolating equipment in the electrical system, what device is most often used as a
visual clearance point?
a) Circuit switchers
b) Fuses
c) Disconnect switches
d) Circuit breakers - ANSWERc) Disconnect switches
What is current?
a) Electrons that flow on a conductor
b) Electrical pressure applied to a conductor
c) Sine wave
d) Water flow rate - ANSWERa) Electrons that flow on a conductor
How many phases are there in most high voltage power systems?
a) 10 phases
b) 1 phase
c) 3 phases
, d) 2 phases - ANSWERc) 3 phases
What does the term system fault mean?
a) the physical problem in a device, component or element
b) abnormal current flow on an unintended path
c) a device or component not operating as designed
d) the fault of the system for not operating as designed - ANSWERb) abnormal current
flow on an unintended path
What is the most common type of fault on the power system?
a) Line to Ground
b) Line to Line
c) Three Phase
d) Phase to Neutral - ANSWERa) Line to Ground
When a high voltage transmission line is producing reactive power due to the conductor
being energized and lightly loaded, the line exhibits which characteristic?
a) Resistive
b) Inductive
c) Lagging
d) Capacitive - ANSWERd) Capacitive
Why would a power company purchase generation from another company versus
generating themselves to meet their load?
a) So they can sell at a profit
b) To create inadvertent
c) For Economics
d) Don't have enough generation - ANSWERc) For Economics
What is a common type of substation configuration?
a) Breaker and a half
b) Highway
c) Radial
d) Junction - ANSWERc) Radial
In normal operations, which type of power usually has the largest magnitude?
a) Real Power
b) Apparent Power
c) Reactive Power
d) Hydro Power - ANSWERb) Apparent Power
ANSWERS 100% SOLVED
,When current in an AC circuit is doubled, power losses in the circuit will respond in
which way?
a) half as much
b) does not change
c) doubles
d) four times greater - ANSWERd) four times greater
What determines the size of insulators used on power lines?
a) Current flow on the line
b) Voltage level of the line
c) Reactance of the line
d) Operating Limit of the line - ANSWERb) Voltage level of the line
Reactive power is needed to support which type of load?
a) Inductive
b) Capacitive
c) Impedance
d) Resistive - ANSWERa) Inductive
When isolating equipment in the electrical system, what device is most often used as a
visual clearance point?
a) Circuit switchers
b) Fuses
c) Disconnect switches
d) Circuit breakers - ANSWERc) Disconnect switches
What is current?
a) Electrons that flow on a conductor
b) Electrical pressure applied to a conductor
c) Sine wave
d) Water flow rate - ANSWERa) Electrons that flow on a conductor
How many phases are there in most high voltage power systems?
a) 10 phases
b) 1 phase
c) 3 phases
, d) 2 phases - ANSWERc) 3 phases
What does the term system fault mean?
a) the physical problem in a device, component or element
b) abnormal current flow on an unintended path
c) a device or component not operating as designed
d) the fault of the system for not operating as designed - ANSWERb) abnormal current
flow on an unintended path
What is the most common type of fault on the power system?
a) Line to Ground
b) Line to Line
c) Three Phase
d) Phase to Neutral - ANSWERa) Line to Ground
When a high voltage transmission line is producing reactive power due to the conductor
being energized and lightly loaded, the line exhibits which characteristic?
a) Resistive
b) Inductive
c) Lagging
d) Capacitive - ANSWERd) Capacitive
Why would a power company purchase generation from another company versus
generating themselves to meet their load?
a) So they can sell at a profit
b) To create inadvertent
c) For Economics
d) Don't have enough generation - ANSWERc) For Economics
What is a common type of substation configuration?
a) Breaker and a half
b) Highway
c) Radial
d) Junction - ANSWERc) Radial
In normal operations, which type of power usually has the largest magnitude?
a) Real Power
b) Apparent Power
c) Reactive Power
d) Hydro Power - ANSWERb) Apparent Power
