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Electrical Machines

Electrical Machines
A DC 4 pole lap wound generator is running at 1000 rpm having 1200 conductors and flux density is 10 mwb. find the generated emf?

 10V
 20V
 100V
 200V

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Electrical Machines
A 10KVA auto transformer, turn ratio is 0.4. Find the power transferred inductively?

 4 KVA
 0 KVA
 10 KVA
 6 KVA

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Electrical Machines
A 3 - Φ induction motor draws an current of 50 A from mains when starts by direct switching. If an auto transformer with 60 % tapping is used for starting the current drawn from the mains will be

 80.
 50.
 36.
  18.

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Electrical Machines
If the number of rotor slots is equal to number of stator slots, then motor refuses to start. Hence it is known as

  cogging.
  relative speed.
  air gap.
  crawling.

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Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 Nr
 S.Ns
 Zero
 Ns

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Electrical Machines
Which type of motors are preferred in lifts?

 DC compound motors.
 DC series motors.
None of these
 DC shunt motors.

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