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Electrical Machines

Electrical Machines
Voltage regulation of transformer is given by

 (E2 - V2) / V2
 (V2 - E2) / V2
 (V2 - E2) / E2
 (E2 - V2) / E2

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Electrical Machines
A synchronous generator is feeding a zero power factor (lagging) load at rated current. The armature reaction is

 cross – magnetizing.
  demagnetizing.
 ineffective.
 magnetizing.

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Electrical Machines
In most condition which frame of motor will be preferred?

  Totally enclosed fan coiled.
 Open type.
 Splash proof.
 Drip proof.

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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/ 4Sa
 PZL/4S
 PZL/4SP²
 PZL/4Sa²

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Electrical Machines
In synchronous generator a synchronous dead load (lamp, furnaces etc) has no ____________ hence it has no natural frequency of oscillation.

 mechanical rotatory system.
 damping torque.
  restoring torque.
 synchronizing power co efficient.

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Electrical Machines
In a transformer, the frequency of a voltage at the secondary is

 equal to primary.
 less than primary.
 any of the above.
 greater than the primary.

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