1|Page
Instrumentation NCCER Practice Test with 230
Questions and Correct Answers/ NCCER
Instrumentation Correctly Answered Practice Exam
Two junction boxes are each located located on different
walls, 12 inches from the same corner. Given a 90 deg.
Bend with a take-up and a gain of 2
2 1/4, what what is the developed length of the conduit
between them? - ...ANSWER...✓✓ 21 3/4 inches
Which of the following is most commonly used to cut RMC
and IMC - ...ANSWER...✓✓ Pipe cutter
Which of the following transformers can be ventilated, air
cooled, or sealed?
A. Less flammable liquid insulated
B. Oil-insulated transformers
C. dry-type
D. nonflammable fluid inslulated - ...ANSWER...✓✓ Dry-
type transformers
,2|Page
Before starting a cable pull, make sure that ________. -
...ANSWER...✓✓ All communication equip. is working
properly
When performing thermographic surveys, a major
deficiency is indicated by a gradient of _______. -
...ANSWER...✓✓ 16 deg celcius
The voltage imbalance trip point for a programmable
solid-state overload relay is typically set for _________. -
...ANSWER...✓✓ 5 %
The basic purpose of switchgear is to _________.
A. provide protective grounding for equip.
B. insulate conductors from hazardous atmospheres
C. provide power system protection by automatically
isolating faulty components.
D. provide a grounding system for AC systems between
50v and 1000v - ...ANSWER...✓✓ C. provide a power
system protection by automatically isolating faulty
components
, 3|Page
The line voltages in a Y connection are __________. -
...ANSWER...✓✓ 1.732 times higher than the phase voltage
A transformer can be checked for shorted turns using
a(n) _____. - ...ANSWER...✓✓ TTR tester
A typical hand crank wire puller, using 30 pounds of
force, can pull up to ______________. - ...ANSWER...✓✓
1,500 pounds
A device used to step up generated voltage to make it
suitable for commercial transmission is called a
__________. - ...ANSWER...✓✓ power transformer
What provides a curved surface for the cable to follow as
it passes from the tray? - ...ANSWER...✓✓ Dropout plate
Capacitors are covered in __________. - ...ANSWER...✓✓
NEC Article 460
An SSOLR initiates a trip if the phase currents exceed
what percentage of the trip current dial setting? -
...ANSWER...✓✓ 125%
Instrumentation NCCER Practice Test with 230
Questions and Correct Answers/ NCCER
Instrumentation Correctly Answered Practice Exam
Two junction boxes are each located located on different
walls, 12 inches from the same corner. Given a 90 deg.
Bend with a take-up and a gain of 2
2 1/4, what what is the developed length of the conduit
between them? - ...ANSWER...✓✓ 21 3/4 inches
Which of the following is most commonly used to cut RMC
and IMC - ...ANSWER...✓✓ Pipe cutter
Which of the following transformers can be ventilated, air
cooled, or sealed?
A. Less flammable liquid insulated
B. Oil-insulated transformers
C. dry-type
D. nonflammable fluid inslulated - ...ANSWER...✓✓ Dry-
type transformers
,2|Page
Before starting a cable pull, make sure that ________. -
...ANSWER...✓✓ All communication equip. is working
properly
When performing thermographic surveys, a major
deficiency is indicated by a gradient of _______. -
...ANSWER...✓✓ 16 deg celcius
The voltage imbalance trip point for a programmable
solid-state overload relay is typically set for _________. -
...ANSWER...✓✓ 5 %
The basic purpose of switchgear is to _________.
A. provide protective grounding for equip.
B. insulate conductors from hazardous atmospheres
C. provide power system protection by automatically
isolating faulty components.
D. provide a grounding system for AC systems between
50v and 1000v - ...ANSWER...✓✓ C. provide a power
system protection by automatically isolating faulty
components
, 3|Page
The line voltages in a Y connection are __________. -
...ANSWER...✓✓ 1.732 times higher than the phase voltage
A transformer can be checked for shorted turns using
a(n) _____. - ...ANSWER...✓✓ TTR tester
A typical hand crank wire puller, using 30 pounds of
force, can pull up to ______________. - ...ANSWER...✓✓
1,500 pounds
A device used to step up generated voltage to make it
suitable for commercial transmission is called a
__________. - ...ANSWER...✓✓ power transformer
What provides a curved surface for the cable to follow as
it passes from the tray? - ...ANSWER...✓✓ Dropout plate
Capacitors are covered in __________. - ...ANSWER...✓✓
NEC Article 460
An SSOLR initiates a trip if the phase currents exceed
what percentage of the trip current dial setting? -
...ANSWER...✓✓ 125%
