ELECTRICITY LEVEL 3 SECTION 6
CORRECT 100%
A downed power line is most likely to result in a(an) - ANSWER phase failure
The continuous current that a circuit breaker can carry without exceeding a standard
temperature rise is known as the - ANSWER rated current
Wires from a sensor to a ground fault relay should be no longer than - ANSWER 25ft
Which of the following tests is conducted in order to detect loose connections? -
ANSWER Heat scanning test
The voltages and currents used in the primary circuits of substations are reduced to
usable levels by - ANSWER instrument transformers
What is a standard output voltage of potential transformers? - ANSWER 120V
The most important consideration for selecting a current transformer for relaying is the -
ANSWER saturation characteristics
Which of the following is a current transformer? - ANSWER oil-filled
The basic purpose of switchgear is to - ANSWER provide power system protection by
automatically isolating faulty components
Circuit breaker ratings are given - ANSWER on the breaker nameplate
The three sections of switchgear enclosures are the front section, the bus section, and
the - ANSWER cable or termination section
The resistance of switchgear should be checked using a - ANSWER 1,000V megger
Connection diagrams should be used to - ANSWER show the internal wiring
connections between the parts that make up an apparatus
When performing themographic surveys, a major deficiency is indicated by a gradient of
- ANSWER 16 deg C
According the the NEC, neutral conductors size No. 6 and smaller must have a
continuous marking of white or - ANSWER gray
The three basic methods of sensing ground faults are ground-return, residual, and -
ANSWER zero sequence
CORRECT 100%
A downed power line is most likely to result in a(an) - ANSWER phase failure
The continuous current that a circuit breaker can carry without exceeding a standard
temperature rise is known as the - ANSWER rated current
Wires from a sensor to a ground fault relay should be no longer than - ANSWER 25ft
Which of the following tests is conducted in order to detect loose connections? -
ANSWER Heat scanning test
The voltages and currents used in the primary circuits of substations are reduced to
usable levels by - ANSWER instrument transformers
What is a standard output voltage of potential transformers? - ANSWER 120V
The most important consideration for selecting a current transformer for relaying is the -
ANSWER saturation characteristics
Which of the following is a current transformer? - ANSWER oil-filled
The basic purpose of switchgear is to - ANSWER provide power system protection by
automatically isolating faulty components
Circuit breaker ratings are given - ANSWER on the breaker nameplate
The three sections of switchgear enclosures are the front section, the bus section, and
the - ANSWER cable or termination section
The resistance of switchgear should be checked using a - ANSWER 1,000V megger
Connection diagrams should be used to - ANSWER show the internal wiring
connections between the parts that make up an apparatus
When performing themographic surveys, a major deficiency is indicated by a gradient of
- ANSWER 16 deg C
According the the NEC, neutral conductors size No. 6 and smaller must have a
continuous marking of white or - ANSWER gray
The three basic methods of sensing ground faults are ground-return, residual, and -
ANSWER zero sequence
