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ELECTRICIAN NCCER EXAM REVIEW QUESTIONS AND ANSWERS
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ELECTRICIAN NCCER EXAM REVIEW QUESTIONS AND ANSWERS
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ELECTRICIAN NCCER EXAM REVIEWQUESTIONS AND ANSWERS
Which article of the NEC covers grounding? - Answer-Article 250
What is a dropout plate? - Answer-Metal plate with a curve surface for cable to follow as
it passes from the tray
All of the following are common service voltages in the United States Except: - Answer-
372/575 3-Phase, 4-wire
What does a GFCI breaker do? - Answer-Opens a circuit to prevent operation of an
electrical device
What will happen when one or more coils in a winding are grounded? - Answer-The
motor will automatically blow fuses
eight incandescent lighting fixtures are to be installed. Each fixture is 120 volts, with a
200-whatt lamp what is the total connected load? - Answer-13.3 Amps
The __________must be grounded in a bussed glutter if use as the main service
equipmemt - Answer-Neutral busbar
When wall mounting cable tray, ensure that - Answer-The building structure is strong
enough to support the tray system
The purpose of sealing cable ends when reels of cable are in storage is
______________ - Answer-to keep moisture from creeping in
The outer covering on liquid-tight flexible metal conduit is use for - Answer-A moisture
seal
A good electrical connection should - Answer-Be mechanically and electrically secure
The symbol normally use for duplex - Answer-Circle with two parallel lines draw through
it
Disconnecting means are covered in - Answer-NEC section 110-22
In relation to switches, the term throw refers to the - Answer-Number of internal
operations that switch can perform
A 3-phase, 4-wire, 480v service requires ________ current transformers - Answer-3
Services conductors and equipment are covered in - Answer-NEC Article 230
,The NEC required that all receptacles installed on 25 amp and 20 amp branch circuits
be__________ receptacles - Answer-Grounding
The circular mil is based on the - Answer-Cross-sectional area of the wire
A transformer with the primary of 400 turns and a secondary of 300 turns has a -
Answer-Step down turns ratio of 4:3
Of the termination classes listed below,_____ is the only one that provides a seal
against external elements - Answer-Class 1
Unless otherwise noted, the calculations in AC circuits ______ values - Answer-Rms
When the coil turns increased the ________ - Answer-Induced voltage is increased
As the temperature surrounding a self regulating heating cable rises, the ________ -
Answer-Resistance of the polymeric core increases
The motor type that has the highest starting torque is the _________ motor - Answer-
Capacitor - start
For a given number of poles, the________ determines the speed of an AC Motor. -
Answer-Frequency
Both induction and synchronous motor operate on the principle of the
rotating________field - Answer-Magnetic
A Transformer has 200 turns in the primary, 150 turns in the secondary, and 120VAC
applied to the primary. The voltage across the secondary is - Answer-90 Volts
The output capacity of a motor is rated in - Answer-Horsepower
The synchronous speed at witcha 4 pole, 60 Hz induction motor operates is ________
rpm - Answer-1800
The sine of 0 degree is - Answer-0
In a AC circuit containing resistance only, _______ 12A will flow if the resistance is 10
ohms and the voltage is 120V - Answer-12A
The _____ rotor types are generally rugged - Answer-Squirrel cage
The componente labeled 7 in figure 1 is a (an) - Answer-End seal
Meters used in AC circuits indicate the_______ - Answer-Effective
, Proofs tests are made at________ oF the original factory voltage - Answer-60%
Which type of heating cable can not be cut and terminated in the field? - Answer-
Mineral insulated
The secondary of a CT under load should not be opened because of______ - Answer-
Induced hight voltage
In a transformer,______ - Answer-Electromagnetic induction occurs
When a ground rod is installed, the top of the rod must be positioned _____.grade -
Answer-Flush with or below
When making offset bends, the two kicks must be made perfectly parallel or the
resulting offset will have a ________ - Answer-Crooked bend
All of the following types of condulet may be used as a pulling point for conduit that
requires a 90 degree change in direction, except_______ - Answer-C
To be effective, a grounding system must limit the voltage on the electrical system and
protect it from all of the following, except ______ - Answer-Undervoltage conditions
What is the most common service use in a temporary power panel? - Answer-120/240
volt, 1-phase, 3-wire
What are the 2 most common types of overcurrent protective devices? - Answer-Circuit
breakers and fuses
What instrument is use to perform an insulation resistance test on a 480 volt motor
winding? - Answer-Megohmmeter
What is a seal installed in a run of conduit in a class I location? - Answer-Prevent the
passage of explosive gases in the conduit
Which of the following is the correct formula for OHM's law? - Answer-I=E/R
Which of the following testing instruments operated on the current transformer principle
- Answer-Clamp-on ammeter
A drowning showing a point A to point B hookup of conductors is called a - Answer-
Wiring diagram
What does HOA usually mean in a motor control circuit - Answer-Hands of automatic
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