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Electrical Machines

Electrical Machines
For small value armature current Ia the torque developed by a DC series motor is proportional to

  √Ia.
  Ia.
  1/Ia.
  Ia2.

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Electrical Machines
In an alternator the voltage generated per phase is proportional to

  flux per pole.
  number of turns in coil.
All of these
  frequency of waveform.

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Electrical Machines
In Ward-Leonard method of speed control, the direction of rotation of motor is reversed usually reversing the connection of the

 generator armature terminal.
 motor armature terminal.
 motor field terminal.
 generator field terminal.

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Electrical Machines
A DC shunt generator builds up 230 V when driven in clockwise direction. In case it is driven in anti clockwise direction, other things remaining unchanged, then the voltage build up is

 some what more than 230 V
 some what less than 230 V
 230 V
 not possible

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Electrical Machines
For a dc machine shunt resistance and armature resistance values are

 high and low
 low and high
 high and high
 low and low

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Electrical Machines
Centrifugal switch is absent in which of the single phase induction motor?

  PSC (permanent split capacitor) motor.
 Shaded pole motor.
 Split phase motor.
None of these

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MORE MCQ ON Electrical Machines

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