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Electrical Machines

Electrical Machines
The sequence of induction motor is RYB, then the direction of induction motor can be changed by which of the following sequence?

 BYR
All of these
 RBY
 BRY

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

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

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Electrical Machines
The volt-ampere euation for a long-shunt compound motor is given by

 Vt = Ea + Iara+ ILrs
 Vt = Ea + Ia(ra + rs)
 Vt= Ea– Iara
 Vt= Ea + Iara

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Electrical Machines
Consider the following statements : 1. interpole windings are connected in series with armature windings 2. polarity of interpoles must be the same as that of the main poles in advance 3. distortion of the main field under the pole shoes is not affected by the use of interpoles From above, the correct answer is

 2 and 3
 1 and 3
 1 and 2
 1 alone

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Electrical Machines
The breakdown torque of a synchronous motor varies as

 1/V²
 V²
 1/V
 applied voltage V

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Electrical Machines
Counter emf of a DC motor

 exceeds supply voltage
 helps in energy conversion.
 regulates its armature voltage.
 aids applied voltage.

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