Electrical Final 3Bf Exam Questions And
Answers
Thermographic surveys are conducted using a(n) _____. -
correct answer ✅infrared imager
Wires from a ground fault relay to a trip coil should be no longer
than _____. -
correct answer ✅50'
When performing thermographic surveys, a major deficiency is
indicated by a gradient of _____. -
correct answer ✅16°C
The resistance of switchgear should be checked using a _____. -
correct answer ✅1,000V megger
The standard output voltage of potential transformers is 120V or
_____. -
correct answer ✅69.3V
Substation transformers used to reduce the voltages and currents in
the primary circuits to the levels used in metering equipment are
known as _____. -
correct answer ✅instrument transformers
,Electrical Final 3Bf Exam Questions And
Answers
Connection diagrams are used to _____. -
correct answer ✅show the internal wiring connections between
the parts that make up an apparatus
According to the NEC®, neutral conductors size No. 6 and smaller
MUST have a continuous marking of white or _____. -
correct answer ✅gray
The three basic methods of sensing ground faults are zero
sequence, residual, and _____. -
correct answer ✅ground-return
Busbars are typically made of _____. -
correct answer ✅silver-plated or tin-plated copper or tin-plated
aluminum
Which of the following abbreviations is used on electrical drawings
to represent an oscilloscope? -
correct answer ✅CRO
, Electrical Final 3Bf Exam Questions And
Answers
Nonstandard abbreviations on electrical prints will typically be
defined on the _____. -
correct answer ✅legend
The continuous current that a circuit breaker can carry without
exceeding a standard temperature rise is known as the _____. -
correct answer ✅rated current
The basic purpose of switchgear is to provide a means of switching
or disconnecting power system apparatus and _____. -
correct answer ✅provide power system protection by
automatically isolating faulty components
A downed power line is MOST likely to result in a(n) _____. -
correct answer ✅phase failure
A type of oil-filled current transformer is the _____. -
correct answer ✅donut type
A test that can be used to detect loose connections is a(n) _____. -
correct answer ✅heat scanning test
Answers
Thermographic surveys are conducted using a(n) _____. -
correct answer ✅infrared imager
Wires from a ground fault relay to a trip coil should be no longer
than _____. -
correct answer ✅50'
When performing thermographic surveys, a major deficiency is
indicated by a gradient of _____. -
correct answer ✅16°C
The resistance of switchgear should be checked using a _____. -
correct answer ✅1,000V megger
The standard output voltage of potential transformers is 120V or
_____. -
correct answer ✅69.3V
Substation transformers used to reduce the voltages and currents in
the primary circuits to the levels used in metering equipment are
known as _____. -
correct answer ✅instrument transformers
,Electrical Final 3Bf Exam Questions And
Answers
Connection diagrams are used to _____. -
correct answer ✅show the internal wiring connections between
the parts that make up an apparatus
According to the NEC®, neutral conductors size No. 6 and smaller
MUST have a continuous marking of white or _____. -
correct answer ✅gray
The three basic methods of sensing ground faults are zero
sequence, residual, and _____. -
correct answer ✅ground-return
Busbars are typically made of _____. -
correct answer ✅silver-plated or tin-plated copper or tin-plated
aluminum
Which of the following abbreviations is used on electrical drawings
to represent an oscilloscope? -
correct answer ✅CRO
, Electrical Final 3Bf Exam Questions And
Answers
Nonstandard abbreviations on electrical prints will typically be
defined on the _____. -
correct answer ✅legend
The continuous current that a circuit breaker can carry without
exceeding a standard temperature rise is known as the _____. -
correct answer ✅rated current
The basic purpose of switchgear is to provide a means of switching
or disconnecting power system apparatus and _____. -
correct answer ✅provide power system protection by
automatically isolating faulty components
A downed power line is MOST likely to result in a(n) _____. -
correct answer ✅phase failure
A type of oil-filled current transformer is the _____. -
correct answer ✅donut type
A test that can be used to detect loose connections is a(n) _____. -
correct answer ✅heat scanning test
