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Electrical Machines

Electrical Machines
In a transformer zero voltage regulation is achieved at a load power factor which is

 leading
 lagging
 unity
 zero

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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?

 1.4.
  1.2.
 1.5.
 1.8.

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Electrical Machines
Which of the following load normally needs starting torque more than rated torque?

 Centrifugal pumps.
 Blowers.
  Conveyers.
 Air compressors.

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Electrical Machines
A delta/star transformer is connected in parallel to a star/delta transformer. The turn ratio former is x times latter, the x is

 1/3
 √3
 1/√3
 3

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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor will

 none of these.
 Decrease.d
 remains same.
 increase.

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM has a rotor speed of 987 rpm find rotor frequency?

  0.65 Hz.
 0.75 Hz.
 0.70 Hz.
  60 Hz.

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