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Electrical Machines

Electrical Machines
Which type of motors are preferred in lifts?

 DC shunt motors.
 DC compound motors.
 DC series motors.
None of these

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Electrical Machines
Short circuiting is caused in the armature winding due to

  failure of insulation between two turns of coil.
  grounding of two or more turns of the same coil.
 failure of insulation between two commutator bars.
  any of above.

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Electrical Machines
A 3-phase, alternator has generated emf per phase of 230 V with 10% 3rd harmonic and 6% 5th harmonic content. Calculate rms line voltage for star connection.

 399 V.
  230.2 V.
 50 V.
 100 V.

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Electrical Machines
Which of the following will vary the maximum torque?

 rotor reactance X
 both 1 and 2
 rotor resistance R
None of these

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Electrical Machines
In DC generators, the cause of rapid brush wear may be

 rough commutator surface.
 any of above.
 imperfect contact.
 severe sparking.

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Electrical Machines
In a DC generator sparking between brushes and commutator surface may be due to

  under commutation.
  too rapid reversal of current.
 over commutation.
  any of the above.

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