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Electrical Machines

Electrical Machines
For the purpose of starting an induction motor, star/delta switch is an equivalent to auto transformer of ratio

 66.3%
 57.7%
 33.3%
 50%

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Electrical Machines
If the field winding connection of DC shunt motor is changed

  It will run in opposite direction.
 motor will become slow.
 It will run in same direction.
 motor will not run.

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Electrical Machines
The maximum possible speed at which an alternator can be driven to generate 50 Hz and 4000 V is

  3600 rpm.
  4000 rpm.
  1500 rpm.
  3000 rpm.

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Electrical Machines
The flux is maximum in the following part of a DC motor:

 under the interpole.
 pole core.
 under leading pole tip.
 under trailing pole tip.

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

 Fleming's right hand rule.
 Lenz's law.
  Fleming's left hand rule.
 Ampere's law.

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Electrical Machines
In synchronous generator V curve is drawn between

 field current on Y-axis and armature current on X-axis.
 either of these.
 field current on X-axis and power factor on Y-axis.
 field current on X-axis and armature current on Y-axis.

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MORE MCQ ON Electrical Machines

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