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Electrical Machines

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

 100 Ω
 10 Ω
 50 Ω
 0.1 Ω

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Electrical Machines
A dc shunt generator has full-load voltage regulation of 10% at rated speed of 1000 rpm. If it is now driven at 1250 rpm, then its voltage regulation at full load would

 remain unchanged
 be less than 10%
 be more than 10%
 be 12.5%

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Electrical Machines
In a DC Motor 3 point starter is used to

 provide protection against Low-Voltage.
 all of above.
 provide overload protection.
 limit the starting current to a safer value.

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Electrical Machines
If peak value of phase mmf is F max , then peak value of the rotating field caused by three phase is

  (3/2)Fmax.
 Fmax.
 (1/2)Fmax.
 3Fmax.

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Electrical Machines
A 100/10, 50 VA double winding transformer is converted to 100/110 V auto transformer. The rating of auto transformer is

 500 VA
 110 VA
 100 VA
 550 VA

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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

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

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MORE MCQ ON Electrical Machines

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