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NCCER TEST -
QUESTIONS AND CORRECT DE TAILED
ANSWERS ( ANSWERS )
Most common transformer on an industrial site - ANSWER- single phase step down
applications for heat tracing systems with self regulating control include those requiring a narrow operating range and - ANSWER- temperature sensitive fluids
with a row of 3-4'', 3-2'' and 1-1'' conduits on each side for a straight pullbox what is the minimum distance between the opposite side walls of the box - ANSWER- 32''
As the mechanical load increases on a squirrel cage induction motor - ANSWER- torque decreases and stator current increases
when installing cables smaller the 4/0 in cable tray, the allowable cable fill area must not be less than the sum of the cable - ANSWER- cross sectional areas
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Meter used to measure pulling tension - ANSWER- dynamometer
on a push button, normally closed contacts are generally used to open a circuit to - ANSWER- initiate a stop or off circuit function
which of the following is the classified location where combustible dust may be present - ANSWER- class i, division i
which of the following is the classified location where combustible fibers are always present - ANSWER- Class 3, division ?
Minimum space between 2 ground rods - ANSWER- 6ft
how does a battery produce voltage - ANSWER- electromagnetisim
as the load decreases on a squirrel cage induction motor, its power factor - ANSWER- increases
what size wire is needed for a 120v circuit 215 feet long one way with a load of 39amps - ANSWER- #6 2 / 3
which of the following conductors has the least resistance -
ANSWER- 1/0
what is the primary consideration for selecting a rope for a cable pull - ANSWER- low stretch
what is the minimum distance between raceway entries allowed in a pull box for angle pulls - ANSWER- 6x's the largest trade size raceway
45degree offset multiplier - ANSWER- 1.41
all of the following are common service voltages in the US except - ANSWER- 372/575 three phase, four wire
Insulation resistance tester - ANSWER- megohmeter
insulation color for barrel crimp connectors for wire sizes 22- 16AWG are - ANSWER- red
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