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Electrical Machines

Electrical Machines
For the purpose of starting an induction motor, star/delta switch is an equivalent to auto transformer of ratio

 57.7%
 50%
 66.3%
 33.3%

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Electrical Machines
DC generators are usually designed to develop armature voltages not exceeding 650 V because of the limitations imposed by

 field winding
 commutator
 starters
 armature winding

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Electrical Machines
In case of a dc motor the ratio Eb / E is indicative of

  ratio of input to output voltage.
  ratio of starting to running current.
  efficiency.
  ratio of starting to running torque.

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Electrical Machines
The type of DC motor generally used for shears and punches is

 Shunt motor.
 Differential compound motor.
 Cummulative compound motor.
 Series motor.

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be

 6 V
 474 V
 240 V
 234 V

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Electrical Machines
In a 3 - Φ wound rotor induction motor the short circuit gear is used to short circuit the

  starting resistance in the starter.
None of these
  rotor at slip rings.
  stator phases of the motor.

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