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Electrical Machines

Electrical Machines
Which of the following motors has low ratings only?

 Shaded pole
 Resistance split phase
 Capacitor start
 Capacitor run

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

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

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Electrical Machines
R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is

 K²R1
 R1 /K²
 K×R1
 R1 /K

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Electrical Machines
In a DC generator, if P be the number of poles and N be the rpm of the rotor, then frequency of magnetic reversals will be

 PN/60.
 PN/120.
 PN/3000.
 PN/2.

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Electrical Machines
The self induced emf in the coil undergoing commutation is called the

None of these
  statically induced voltage.
  dynamically induced voltage.
  reactance voltage.

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Electrical Machines
High starting torque and low starting current is the advantage of

  squirrel cage induction motor.
  hysteresis motor.
  stepper motor.
  slip ring induction motor.

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