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Electrical Machines

Electrical Machines
The slot edges in a DC machine are made of

  Fibre.
 Silicon steel.
 Cast iron.
 Mild steel.

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Electrical Machines
The fall in speed of the DC generator due to increase in load can be corrected by

 cooling the armature.
  increasing the excitation.
  increasing the input to the prime mover.
  reducing the load voltage.

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Electrical Machines
A slip ring Induction motor runs at 290 rpm at full load, when connected to 50 Hz supply. Determine the number of poles and slip.

  P = 50, s = 4.43 %.
  P = 20, s = 3.33 %.
  P = 60, s = 0.96 %.
  P = 40, s = 5.79 %.

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Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

 T ∝ 1/V
 T∝ V²
 T ∝ V
 T ∝ 1/V²

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

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

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Electrical Machines
What type of connection is made in between the inter-pole and the field winding?

 Compound.
 None of the options.
 Parallel.
  Series.

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MORE MCQ ON Electrical Machines

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