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NCCER Electrical Level 2 Module 2 Motors: Theory and Application Sections 1-6 Questions and Answers $10.99
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NCCER Electrical Level 2 Module 2 Motors: Theory and Application Sections 1-6 Questions and Answers
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NCCER Electrical Level 2 Module 2 Motors: Theory and Application Sections 1-6 Questions and Answers The two primary types of motor enclosures classified by NEMA are ____. - ANS open and totally enclosed An open AC squirrel cage motor that makes use of​ form-wound coils and an insulation sy...

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  • August 28, 2024
  • 10
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • nccer electrical level 2 module 2 motors theory a

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  • NCCER Electrical

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NCCER Electrical Level 2 Module 2
Motors: Theory and Application Sections
1-6 Questions and Answers
The two primary types of motor enclosures classified by NEMA are ____. - ANS open
and totally enclosed




A
An open AC squirrel cage motor that makes use of​form-wound coils and an insulation
system is known as​a(n) _____. - ANS sealed windings(type)




VI
The NEMA frame designation for gasoline pump motors is ____. - ANS G




TU
The letters FLA on a motor nameplate stand for ____. - ANS full-load amps

To determine the horsepower rating of a motor that is already installed and in place,
____. - ANS check the nameplate data
IS
Most industrial motors are NEMA Design ____. - ANS B
OM

The multiplier to the nameplate horsepower rating is called the _____. - ANS service
factor

The code requirements for motor disconnects are covered in ___. - ANS 430.102
NA


All motors must have a thermal protector if their voltage rating is greater than​_____. -
ANS 600V-1,000V

To protect the motor from overloads and starting failures, use a ____. - ANS thermal
JP




protector

When studying the operation of electric motors, it is important to remember that
magnetic lines of force ____. - ANS do not cross

If a motor has 4 poles and is operating at a frequency of 60Hz, its synchronous speed is
_____. 120(60Hz)/4= 1,800 rpm - ANS 1,800 rpm

, The type of motor most likely to be used in a location with flammable dust and torque
fluctuations is a ____. - ANS squirrel cage induction motor

A heating system is most likely to use a _____. - ANS single-phase induction motor

With a constant-torque load, the horsepower ____. - ANS varies in direct proportion to
the speed

When variable-frequency speed control is used on a motor with a nameplate rating of
480V at 60Hz, the voltage-to-frequency ratio is ___. 480v/60hz=8 - ANS 8




A
When using a motor with dynamic braking, ____. - ANS electromechanical friction




VI
brakes may be required with large loads

A NEMA designation for a type of enclosed motor is _____. - ANS explosion-proof




TU
Using NEMA frame designations, the distance from the motor feet to the shaft center
line is known as ___. - ANS D dimension
IS
A motor with a NEMA kVA code letter of M has a locked-rotor value of ____. - ANS
10.0-11.9 kVA/hp
OM

A wye-connected motor has _____. - ANS the coils pointed in series

A delta-connected motor has ____. - ANS the coils connected in parallel

Any exposed live parts of motors must be guarded if the motor ____. - ANS operates
NA


at 50V or more between terminals

Per NEC Section 430.32, a motor with a service factor of 1.0 must trip at ____. - ANS
115% of the full-load current
JP




The most common class of insulation used in manufacturing and rewinding is NEMA
______. - ANS class B

When a single motor is supplied from a branch circuit, the ampacity of the branch circuit
must be _______ of the motor full-load current as determined by NEC Section
430.6(A)(1) - ANS no less than 12.5%

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