NCCER Electrical Exam Questions With Correct Answers Updated Solution

NCCER Electrical




NCCER Electrical Exam Questions
With Correct Answers Updated
Solution

 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




1|P A G E

, NCCER Electrical



 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




2|P A G E

, NCCER Electrical



 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




3|P A G E

, NCCER Electrical



 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

4|P A G E