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Electrical Machines

Electrical Machines
The starting resistance of DC motor is generally

 around 500 ohms.
 Infinitely large.
  Low.
 1000 ohms.

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Electrical Machines
What will be the e.m.f. generated by a 4 pole lap connected DC Generator rotating at 1500 r.p.m.? Its flux per pole is 0.4 mWb and total no of armature conductors is 1000.

 40 volts.
 30 volts.
 20 volts.
 10 volts.

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Electrical Machines
The three point starter is used for

  Shunt motor as well as compound motors.
  Shunt motor.
  Series motor.
  Shunt, compound and series motor.

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Electrical Machines
In a 3 - Φ IM in order to eliminate cogging the number of stator slots must be

  an integral multiple of number of rotor slots.
  unequal to number of rotor slots and skewed in shape.
  equal to number of rotor slots.
  either (B) or (C).

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Electrical Machines
In escalator which motor is used?

  Universal motor.
  1 - φ IM.
  DC shunt motor.
  3 - φ IM.

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Electrical Machines
Which of the following represents the pitch factor?

 Cos (α/2)
 sin (α/2)
 Cos α
 Cos α²

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