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Electrical Machines

Electrical Machines
What is the highest possible speed of turbo alternators?

 1500 rpm
 3000 rpm
 1000 rpm
 4000 rpm

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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
Which DC motor will have least percentage increase of input current, for the same percentage increase in the torque

 DC Shunt Motor
 Compound Wound DC Motor
 Separately Excited DC Motor
 DC Series Motor

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Electrical Machines
If an induction machine is run at above the synchronous speed it acts as

 a synchronous motor
 an induction motor
None of these
 an induction generator

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Electrical Machines
For a fault at the terminal of a synchronous generator, the fault current is maximum for a

  line to ground fault.
 3 - phase to ground fault.
 line to line fault.
 3 - phase fault.

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

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

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MORE MCQ ON Electrical Machines

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