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Electrical Machines

Electrical Machines
If a DC Series motor is connected across an AC supply it will

 not run.
 run at lower speed.
 burn.
 run at normal speed.

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Electrical Machines
Which motor cannot be started on no load?

 both B and C
 series motors
 cumulative compound motors
 shunt motors

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Electrical Machines
To avoid formation of grooves in the commutator

  the brushes of opposite polarity should track each other.
  brush position has no effect on the commutator grooving.
 the brushes of same polarity should track each other.
None of these

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Electrical Machines
A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors. Calculate the back emf produced when it is running at a speed of 1500 rpm.

  220 volt.
 240 volt.
 440 volt.
 230 volt.

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Electrical Machines
The principal of starting of 3 - Φ IM is similar to

  repulsion motor type starting.
  transformer with short-circuited secondary.
  synchronous motor.
  capacitor run IM.

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Electrical Machines
Stepper motor is used in

 food processing
 traction
All of these
 computer printers

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