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Electrical Machines

Electrical Machines
Transformer cooling and insulating oil must be of

  low viscosity.
 low resistivity.
 high viscosity.
 low BDV.

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Electrical Machines
The use of double squirrel cage winding on the rotor provides

 low noise.
 reduced starting torque.
  a large starting torque.
 higher efficiency.

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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?

 1.8.
 1.4.
  1.2.
 1.5.

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Electrical Machines
Which of the following motors has low ratings only?

 Shaded pole
 Capacitor start
 Capacitor run
 Resistance split phase

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Electrical Machines
For a DC machine having P no of pole pairs Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance for lap-winding ?

 PZL/4S
 PZL/4Sa²
 PZL/4SP²
 PZL/ 4Sa

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Electrical Machines
Stability of a synchronous motor ---------- with the increase in excitation.

 increases
 decreases
 remains unaffected
 any of the above

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