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Electrical Machines

Electrical Machines
In a DC machine, the angle between the stator and rotor fields is

 90o.
 180o.
 dependent upon the load.
 0o.

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Electrical Machines
In DC series motor the speed is ______________ proportional to the armature current.

 inversely.
 has no relation.
 directly.
 none of these.

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Electrical Machines
The working principle of transformer depends on

 Faradays law of electromagnetic induction.
 Amperes law.
 Newtons law.
 Coulombs law.

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Electrical Machines
The flux is maximum in the following part of a DC motor:

 under trailing pole tip.
 under leading pole tip.
 pole core.
 under the interpole.

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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.

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

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Electrical Machines
The primary and secondary windings of a transformer are

  inductively linked.
 electrically linked.
 mechanically linked.
  conductively linked.

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