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Electrical Machines

Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

 more.
 less than 50%.
 same.
 between 50% and 90%.

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Electrical Machines
In which of the following motors DC excitation is not required?

 hysteresis motor
 3-phase synchronous generator
 reluctance motor
 3-phase synchronous motor

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Electrical Machines
Secondary winding of an auto transformer is also called

 tertiary winding.
 damping winding.
  common winding.
 compensating winding.

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Electrical Machines
In travelling cranes for hoisting and lowering which type of motor is preferred?

  Synchronous motor.
  DC series motor.
  Single phase induction motor.
  AC slip ring motor.

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Electrical Machines
A 500 V, 55 kVA single phase alternator has an effective resistance of 0.5 Ω. An excitation current of 10 A produces 200 A armature current on short circuit and an emf of 450 V on per circuit. The synchronous reactance will be

  2.241 Ω.
 2.781 Ω.
 2.74 Ω.
 25.564 Ω.

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Electrical Machines
For a DC machine having P no of pair of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance?

 PZL/4Sa²
 PZL/ 4Sa
 PZL/4Sp²
 PZL/4S

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