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A8 Ch4 Motors Question and answers rated A+ 2024/2025
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A8 Ch4 Motors Question and answers rated A+ 2024/2025 A8 Ch4 Motors & Generators _____ are used on motors and generators, to set up a magnetic field. A) Insulated wires B) Transformers C) Mica strips D) Field poles E) Carbon rings - correct answer d The magnetic field i...

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  • October 4, 2024
  • 39
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • a8 ch4 motors
  • a8 ch4 motors question and answers rated a 20242

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  • BOIE 8010
  • BOIE 8010

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A8 Ch4 Motors & Generators
_____ are used on motors and generators, to set up a magnetic field.


A)
Insulated wires


B)
Transformers


C)
Mica strips


D)
Field poles


E)
Carbon rings - correct answer ✔d


The magnetic field in a DC machine may be supplied by permanent magnets
in small units. Large DC machines use field poles that are essentially:


A)
Non-magnetic


B)

,Electromagnets


C)
Resistors


D)
Flux resistant


E)
Insulators - correct answer ✔b


Alternators are constructed to use slip rings made of brass or:


A)
Steel


B)
Silicon


C)
Copper


D)
Carbon


E)

,Mica - correct answer ✔a


Motor starting devices for DC motors and some AC motors are designed to
limit the starting _____ to a safe value.


A)
Voltage


B)
Current


C)
Speed


D)
Resistance


E)
Torque - correct answer ✔b


An AC motor which will drop out of synchronism and simply trip when
overloaded is the:


A)
Slip-ring induction motor


B)

, Induction motor


C)
Single phase motor


D)
Synchronous motor


E)
Wound rotor induction motor - correct answer ✔d


Shunt wound DC motors are common where speed must remain constant
regardless of load such as on:


A)
Traction engines


B)
Automobile starters


C)
Machinist lathes


D)
Grinders

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