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Electrical Machines

Electrical Machines
The armature MMF waveform of a DC machine is

  sinusoidal.
  triangular.
  rectangular.
  pulsating.

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Electrical Machines
The direction of rotation of a DC motor can be determent by

 Flemings right hand rule.
 Amperes law.
 Lenzs law.
  Flemings left hand rule.

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Electrical Machines
A dc motor with armature resistance of 0.5 ohms connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is

 570 A.
  460 A.
 250 A.
  340 A.

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Electrical Machines
Which type of motors uses slip rings?

 DC Shunt Motor
 Induction motors
 Synchronous motors
 Both Synchronous and Induction motor

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Electrical Machines
A DC shunt generator builds up 230 V when driven in clockwise direction. In case it is driven in anti clockwise direction, other things remaining unchanged, then the voltage build up is

 some what more than 230 V
 not possible
 some what less than 230 V
 230 V

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Electrical Machines
The shaft of induction motor may be unbalanced due to

  overheating of winding.
  uneven air gap.
  overload.
  poor lubrication.

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MORE MCQ ON Electrical Machines

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