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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.
  2.73 KW.
 0.9103 KW.
 1.644 KW.

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Electrical Machines
In a DC compound motor the field regulator is provided to

 demagnetize the field partially.
 limit the armature current.
 control the field flux.
 control the armature flux.

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Electrical Machines
Capacitor start capacitor run provides

  high power factor only.
  high staring torque only.
  none.
  high staring torque and high power factor.

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Electrical Machines
Find the synchronous reactance of alternators in which a given field current of 200 A on short circuit and a generated emf of 50 V on open circuit. Armature resistance is 0.1 ohm

  0.23Ω.
 0.5Ω.
 1Ω.
 0.25Ω.

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Electrical Machines
Resistance commutation is used generally in case of

 DC machines bellow 5 kW.
None of these
  fractional kW DC machines.
 DC machines above 10 kW.

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Electrical Machines
Which of the following motors has negative speed regulation?

 Both B and C.
 Differential compound motors.
 Series motors.
 Shunt motors.

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