Electrician NCCER: Questions & Answers
Which article of the NEC covers grounding? Correct Ans - Article 250
What is a dropout plate?
... [Show More] Correct Ans - 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: Correct Ans - 372/575 3-Phase, 4-wire
What does a GFCI breaker do? Correct Ans - Opens a circuit to prevent operation of an electrical device
What will happen when one or more coils in a winding are grounded? Correct Ans - 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? Correct Ans - 13.3 Amps
The __________must be grounded in a bussed glutter if use as the main service equipmemt Correct Ans - Neutral busbar
When wall mounting cable tray, ensure that Correct Ans - 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 ______________ Correct Ans - to keep moisture from creeping in
The outer covering on liquid-tight flexible metal conduit is use for Correct Ans - A moisture seal
A good electrical connection should Correct Ans - Be mechanically and electrically secure
The symbol normally use for duplex Correct Ans - Circle with two parallel lines draw through it
Disconnecting means are covered in Correct Ans - NEC section 110-22
In relation to switches, the term throw refers to the Correct Ans - Number of internal operations that switch can perform
A 3-phase, 4-wire, 480v service requires ________ current transformers Correct Ans - 3
Services conductors and equipment are covered in Correct Ans - NEC Article 230
The NEC required that all receptacles installed on 25 amp and 20 amp branch circuits be__________ receptacles Correct Ans - Grounding
The circular mil is based on the Correct Ans - Cross-sectional area of the wire
A transformer with the primary of 400 turns and a secondary of 300 turns has a Correct Ans - Step down turns ratio of 4:3
Of the termination classes listed below,_____ is the only one that provides a seal against external elements Correct Ans - Class 1
Unless otherwise noted, the calculations in AC circuits ______ values Correct Ans - Rms
When the coil turns increased the ________ Correct Ans - Induced voltage is increased
As the temperature surrounding a self regulating heating cable rises, the ________ Correct Ans - Resistance of the polymeric core increases
The motor type that has the highest starting torque is the _________ motor Correct Ans - Capacitor - start
For a given number of poles, the________ determines the speed of an AC Motor. Correct Ans - Frequency [Show Less]