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Electrical Machines

Electrical Machines
The armature voltage control is considered suitable for a DC motor driven at constant

 torque.
 power.
 speed.
 current.

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Electrical Machines
For the above problem, find the induced voltage of an alternator of it is to deliver a load of 100 A at power factor of 0.8 lagging with terminal voltage of 200 V.

  222 V.
 225 V.
 230 V.
 220 V.

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Electrical Machines
In dc machines, the space distribution of air-gap flux density wave at no load is

 rectangular
 sinusoidal
 co- sinusoidal
 flat-topped

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Electrical Machines
A 4 pole, 3-phase induction motor is running at 4% slip at full load. If the speed of the motor is 720 rpm, the supply frequency is

 25 Hz
 40 HZ
 50 Hz
 60 Hz

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Electrical Machines
A 3 - Φ, 12 pole, 600 V, 50 Hz star connected IM has rotor resistance and stand still resistance of 0.03 Ω and 0.5 Ω respectively. The speed of maximum torque will be

 450 rpm.
  470 rpm.
  240 rpm.
 540 rpm.

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Electrical Machines
If a transformer has turns ratio K, the primary and secondary current are I1 and I2 respectively and magnetizing current and core loss component of no load current Iμ and Iw respectively, then

 I1 = KI2.
  I1 = KI2 + Iw + Iμ.ok
 I1 = KI2 + Iw.
 I1 = KI2 + Iμ.

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