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Electrical Machines

Electrical Machines
The field divertor resistance for a DC series motor is of order of

 10 Ω
 100 Ω
 0.1 Ω
 50 Ω

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Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  1.0.
  0.5.
  0.1.
  0.05.

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Electrical Machines
A single phase transformer has specifications as 250 KVA, 11000 V/415 V, 50 Hz. What are the values of primary and secondary currents?

 primary = 602 A, secondary = 22.7 A
 primary = 22.7 A, secondary = 602.4 A
 primary = 11.4 A, secondary = 301 A
 primary = 301 A, secondary = 22.7 A

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Electrical Machines
If an additional resistance is connected in series with a DC motor operating at rated speed, the speed of the motor will

  Remain unaltered.
  Reduce.
  Oscillate around the normal speed.
  Increase.

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Electrical Machines
Induction motors have the advantage of

  all of below.
  less cost.
  simple in construction.
  less maintenance.

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

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

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