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Electrical Machines

Electrical Machines
The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is

  50 Hz.
  25 Hz.
  60 Hz.
  16.67 Hz.

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Electrical Machines
A 500 V, 120 KW, 50 Hz, star connected synchronous motor operating at 0.8 power factor leading has full load efficiency of 91%. The armature resistance is equal to 0.08Ω. The magnitude of armature current is nearly equal to

  190 A.
 240 A.
 173 A.
 127 A.

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Electrical Machines
Direct-on-line (DOL) starters are not suitable for starting large DC motors, because

 the motor may not start.
 the motor may run away.
 the starting torque becomes low.
 the starting current will be enormously high.

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Electrical Machines
Which of the following motors is/are widely used?

None of these
 either of these
 squirrel cage induction motor
 slip ring induction motor

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Electrical Machines
The dc motor which can provide zero speed regulation at full load without any controller, is

 shunt.
 differential compound.
 series.
 cumulative compound.

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Electrical Machines
A 3-phase 6 pole 50 Hz induction motor is running at 5% slip.What is the speed of the motor?

 1000 rpm
 950 rpm
 850 rpm
 900 rpm

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