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Electrical Machines

Electrical Machines
Slip exists in

  synchronous motor.
  induction motor.
  in both machines.
  none of above.

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Electrical Machines
Two single-phase alternators operating in parallel have induced EMFs on open circuit of 230∠0° and 230∠10° volts and respective reactance of j2 Ω j3 Ω calculate the terminal voltage

 150 V.
  223.V.
 200 V.
 300 V.

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

 PZL/4Sa²
 PZL/4Sp²
 PZL/ 4Sa
 PZL/4S

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

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

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Electrical Machines
Universal motors are used in

 traction
 cranes
All of these
 food processing

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Electrical Machines
A 500 V, 120 KW, 50 Hz, star connected synchronous motor operating at 0.8 power factor leading has full load efficiency of 91%. The armature resistance is equal to 0.08Ω. The magnitude of armature current is nearly equal to

  190 A.
 127 A.
 240 A.
 173 A.

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