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Electrical Machines

Electrical Machines
When maximum starting torque is obtained, rotor power is

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Electrical Machines
A 4 pole DC generator runs at 750 rpm and generate an emf of 240 V. The armature is wave wound and has 792 conductors. If the total flux from each pole is 0.0145 Wb. What is the leakage co-efficient?

  1.2.
 1.4.
 1.5.
 1.8.

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Electrical Machines
For standing a DC motor a starter is required because

None of these
  it limits the starting current to a safe value.
  It starts the motor.
  it limits the speed of the motor.

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Electrical Machines
If the flux of DC motor approaches zero, its speed will

 aprroach infinity.
 remain unchanged.
 between zero and infinity.
 approach zero.

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. The highest speed of the alternators is

  3600 rpm.
  600 rpm.
  500 rpm.
  3000 rpm.

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Electrical Machines
Maximum allowable moisture content of power transformer insulating oil is generally taken as

 25 ppm.
 20 ppm.
  35 ppm.
 45 ppm.

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