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Electrical Machines

Electrical Machines
Which motor cannot be started on no load?

 series motors
 both B and C
 shunt motors
 cumulative compound motors

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Electrical Machines
In a DC Motor 3 point starter is used to

 provide overload protection.
 all of above.
 limit the starting current to a safer value.
 provide protection against Low-Voltage.

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Electrical Machines
Stepper motor is used in

 computer printers
All of these
 traction
 food processing

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Electrical Machines
The sparking at the the brushes, in a DC machines is due to

 armature reaction.
  reactance voltage.
 presence of commutator.
 high resistance of carbon brushes.

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Electrical Machines
Unbalance 3 - Φ stator currents cause

  vibrations.
  double frequency currents in the rotor.
All of these
  heating of rotor.

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Electrical Machines
A 4 pole dc motor with armature winding resistance of 0.6 ohm receives a supply of 230 Volt. If the back emf produced during running condition is equal to 210 volt. Calculate the current flowing through the armature at this point.

  43 Amp.
 29 Amp.
 44.47 Amp.
  33.33 Amp.

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MORE MCQ ON Electrical Machines

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