NERC RANDOM Exam 90 Questions with Correct
Answers.
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 - Correct Answer d) 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 - Correct Answer b) Voltage level of the line
Reactive power is needed to support which type of load?
a) Inductive
b) Capacitive
c) Impedance
d) Resistive - Correct Answer a) 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 - Correct Answer c) 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 - Correct Answer a) 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 - Correct Answer c) 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 - Correct Answer b) 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 - Correct Answer a) 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 - Correct Answer d) 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 - Correct Answer c) For Economics
What is a common type of substation configuration?
a) Breaker and a half
b) Highway
c) Radial
d) Junction - Correct Answer c) 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 - Correct Answer b) Apparent Power
How are generators typically classified in the power system?
a) Fuel source
b) Cycling capability
Answers.
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 - Correct Answer d) 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 - Correct Answer b) Voltage level of the line
Reactive power is needed to support which type of load?
a) Inductive
b) Capacitive
c) Impedance
d) Resistive - Correct Answer a) 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 - Correct Answer c) 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 - Correct Answer a) 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 - Correct Answer c) 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 - Correct Answer b) 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 - Correct Answer a) 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 - Correct Answer d) 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 - Correct Answer c) For Economics
What is a common type of substation configuration?
a) Breaker and a half
b) Highway
c) Radial
d) Junction - Correct Answer c) 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 - Correct Answer b) Apparent Power
How are generators typically classified in the power system?
a) Fuel source
b) Cycling capability
