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Electrical Machines

Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

 0.7.
 0.3.
  1.
  0.54.

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Electrical Machines
The direction of rotation of conductor of a DC motor can be determined by

 Lenz's law.
 Fleming's right hand rule.
 Fleming's left hand rule.
 Ampere law.

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Electrical Machines
A 100 KVA transformer is operating at 60 Hz, 240 V supply. The same transformer is operating at 50 Hz, 200 V supply. The new rating is

 100 KVA
 123.3 KVA
 50 KVA
 83.33 KVA

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Electrical Machines
Dummy coils are used for

 reducing armature reaction.
 mechanical balancing.
All of these
 increasing efficiency.

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Electrical Machines
What will be the e.m.f. generated by a 4 pole lap connected DC Generator rotating at 1500 r.p.m.? Its flux per pole is 0.4 mWb and total no of armature conductors is 1000.

 10 volts.
 20 volts.
 40 volts.
 30 volts.

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Electrical Machines
Which of the following windings are necessary in case of all dc machines?

 lap winding
 closed winding
 wave winding
 open type winding

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