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Electrical Machines

Electrical Machines
What are slot wedges in a DC machine made of?

 Fibre.
 Mild steel.
 Silicon steel.
 Cast iron.

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Electrical Machines
Find the number of poles required, when the frequency is 50Hz and speed of the motor is 500 rpm?

 24
 12
 10
 5

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Electrical Machines
Why are capacitors used with large AC induction motor?

  Improve power factor.
  Improve power level.
  Improve current level.
  Improve voltage level.

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Electrical Machines
Rotating magnetic field is produced in an induction motor because of

  stator winding.
None of these
  rotor winding.
  either stator winding or rotor winding.

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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

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

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Electrical Machines
When a short circuit test on a transformer is performed at 25 V, 50 Hz, the drawn current is I1. If the test is performed by 25 V and 25 Hz and power drawn current is I2, then

 I1 < I2
 I1 = I2
None of these
 I1 > I2

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