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Electrical Machines

Electrical Machines
If the field current is reduced to zero the maximum power developed by alternator is

 5.46 KW.
 0.9103 KW.
  2.73 KW.
 1.644 KW.

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Electrical Machines
Shunt field of DC generators consists of--------number of turns and ---------- conductors respectively

 less and thick
 less and thin
 large and thin
 large and thick

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Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

 100
 50
 1
 10

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Electrical Machines
In synchronous motor the torque is proportional to

 P²
 Power P
 1/P²
 1/P

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Electrical Machines
What happens if fifth multiples of harmonics is given to induction motor?

  Fail to start.
  Either short circuit or open circuit occurs.
  It will rotates in normal operation.
  It will rotates in reverse direction.

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Electrical Machines
What is the reason for stationary armature essential in alternators above 5 KVA?

All of these
 Collecting of large current is simple.
 Operating cost is less.
 Insulation requirement is less.

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