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Electrical Machines

Electrical Machines
What is the highest possible speed of turbo alternators?

 1000 rpm
 4000 rpm
 3000 rpm
 1500 rpm

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Electrical Machines
Stepper motor is used in

All of these
 computer printers
 food processing
 traction

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Electrical Machines
If the armature electric current is increased to double its previous value, and the time of commutation is halved, how will the reactance voltage vary?

  It will be halved.
 It will remain the same.
  It will becomes four times.
  It will be doubled.

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Electrical Machines
In which of the following speed control of DC motor the speed obtained is below than the rated speed?

 Armature voltage control.
 Any of above.
 Field resistance control.
 Armature circuit resistance control.

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Electrical Machines
In a 2 pole lap winding dc machine , the resistance of one conductor is 2Ω and total number of conductors is 100. Find the total resistance

 100Ω
 50Ω
 10Ω
 200Ω

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Electrical Machines
A 3-phase, 2 pole, 12 slot synchronous machine is operating at synchronous speed. Find the slot angle?

 18°
 60°
 30°
 20°

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MORE MCQ ON Electrical Machines

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