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Electrical Machines

Electrical Machines
Iron losses in a DC machine are independent of variation in

  speed and voltage.
  load.
  voltage.
 speed.

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Electrical Machines
What is the frequency of a alternator, if P = number of poles and N = revolution made per second?

 120 / PN Hz.
 120P / N Hz.
  PN / 2 Hz.
 120N / P Hz.

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Electrical Machines
In a DC motor under constant terminal voltage what is the relation between torque (Te) and power (P)

 T∝ P
 T is independent of P
 T∝ P²
 T∝ P³

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Electrical Machines
Direct-on-line (DOL) starters are not suitable for starting large DC motors, because

 the motor may not start.
 the motor may run away.
 the starting torque becomes low.
 the starting current will be enormously high.

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Electrical Machines
In travelling cranes for crane travel, trolley and boom hoist which motor is preferred?

  DC differential compound motor.
  Synchronous motor.
  Slip ring induction motor.
  Stepper motor.

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Electrical Machines
In normal dc machines operating at full-load conditions, the most powerful electromagnet is

 field winding
 interpole winding
 interpole and compensating windings together
 armature winding

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