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Electrical Machines

Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5Ω and back back emf 200 V is

 440 A.
 44 A.
 400 A.
  40 A.

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Electrical Machines
The basic function of a transformer is to change

 the power factor
 the frequency
 the power level
 the level of the voltage

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Electrical Machines
A single-phase transformer has its maximum efficiency at 60 percent of full load. At full load copper loss will be

 zero.
 equal to core loss.
  more than core loss.
 less than core loss.

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Electrical Machines
Which of the following motor is not suitable for frequent starting and stopping?

 Capacitor run motor
All of these
 Resistance split phase motor
 Capacitor split phase motor

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Electrical Machines
Crawling in an induction motor is due to

  slip ring rotor.
  time harmonics in supply.
  space harmonics produced by winding currents.
  insufficient starting torque.

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

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

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