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Electrical Machines

Electrical Machines
At stand still condition the value of slip is

 0
 finite value
 1
 infinite value

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Electrical Machines
A 3-phase, alternator has generated emf per phase of 230 V with 10% 3rd harmonic and 6% 5th harmonic content. Calculate rms line voltage for star connection.

 50 V.
 100 V.
 399 V.
  230.2 V.

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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 simple wave-winding ?

 PZL/4Sp²
 PZL/ 4Sa
 PZL/4Sa²
 PZL/4S

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Electrical Machines
A three phase induction motor has a synchronous speed of 1500 rpm the machine runs at 1460 rpm at a particular load. The slip at this load is ___________.

  30 %.
  2.67 %.
 5 %.
 1.5 %.

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Electrical Machines
Synchronous condensers are used to

 reduce hunting
 improve the power factor
 improve starting torque
All of these

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Electrical Machines
A 100/10, 50 VA double winding transformer is converted to 100/110 V auto transformer. The rating of auto transformer is

 550 VA
 100 VA
 110 VA
 500 VA

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