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Electrical Machines

Electrical Machines
The back emf produced in a dc motor depends on

  Z.
  P.
  none of these.
  P and Z.

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Electrical Machines
Ideal value of voltage regulation of a device is?

 ∞
 0
 a finite negative value
 a positive finite value

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Electrical Machines
When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop

  induction motor torque.
  induction generator torque.
  DC motor torque.
  synchronous motor torque.

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Electrical Machines
For 250 volt DC Shunt Motor the armature and field resistance are 0.5 ohm and 250 ohm respectively. What will be the back e.m.f. produced when it takes a load current of 21A.

 280 V.
 240 V.
 220 V.
 150 V.

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Electrical Machines
Armature reaction effect is more in which of the following methods?

 field weakening method
 same in both methods
None of these
 armature resistance control

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Electrical Machines
Two single-phase alternators operating in parallel have induced EMFs on open circuit of 230∠0° and 230∠10° volts and respective reactance of j2 Ω j3 Ω calculate the terminal voltage

 200 V.
 300 V.
  223.V.
 150 V.

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