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Electrical Machines

Electrical Machines
The field divertor resistance for a DC series motor is of order of

 100 Ω
 0.1 Ω
 50 Ω
 10 Ω

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Electrical Machines
In a 3-phase induction motor, if the supply voltage and frequency are reduced by the same ratio, then slip at which maximum torque occurs is

 less and maximum torque decreases
 more and maximum torque remains constant
 less and maximum torque increases
 more and maximum torque decreases

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Electrical Machines
To get the speed of DC motor is more than normal without wastage of electrical energy _____________ is used.

  Any of above method.
  Ward Leonard control.
  Rheostatic control.
  None of above.

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Electrical Machines
A 3-phase, alternator has generated emf per phase of 230 V with 10% 3rd harmonic and 6% 5th harmonic content. Calculate rms line voltage for star connection.

  230.2 V.
 50 V.
 399 V.
 100 V.

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Electrical Machines
In salient pole synchronous machine, maximum power occurs at a load angle of

 0°
 less than 90°
 90°
 Greater than 90°

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Electrical Machines
In a 2 pole lap winding dc machine , the resistance of one conductor is 2Ω and total number of conductors is 100. Find the total resistance

 50Ω
 100Ω
 10Ω
 200Ω

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