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Electrician NCCER Questions and Answers 100%
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Exam of 22 pages for the course NCCER at NCCER (Electrician NCCER)
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Electrician NCCERWhich 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
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