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Electrical Machines

Electrical Machines
The induction motor shaft is made of

  mild steel.
  aluminium.
  stainless steel.
  cast iron.

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Electrical Machines
Which of the following motor is used in grinders?

  Synchronous motor.
  Capacitor start IM.
  Split phase IM.
  Capacitor start capacitor run IM.

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Electrical Machines
A 3 stack stepper motor has 12 teeth on stator as well as on rotor. Determine the step size when each stack excited?

 45°.
 30°.
  10°.
 24°.

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Electrical Machines
Which of the following statement is true for an AC synchronous motor?

 It is a high reluctance motor.
 It is a step angled motor.
 It is a variable speed motor.
  It is a constant speed motor.

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Electrical Machines
A 240 V dc series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 Ω. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 1.9 Ω
 5.7 Ω
 2.2 Ω
 6 Ω

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Electrical Machines
The principle of dynamically induced emf is utilized in

 thermocouple.
 transformer.
 generator.
 choke.

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MORE MCQ ON Electrical Machines

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