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Electrical Machines

Electrical Machines
Flux density under trailing pole tips in case of generator will

 decrease
 either increase or decrease
 increase
None of these

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Electrical Machines
If direct axis reactance Xd and quadrature axis reactance Xq are equal, then reluctance power is

 zero
All of these
 minimum
 maximum

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Electrical Machines
Which of the following DC motors has almost constant speed over their full load range?

 Compound (cummolative).
  Shunt.
 Series.
 none of these.

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Electrical Machines
A delta/star transformer is connected in parallel to a star/delta transformer. The turn ratio former is x times latter, the x is

 √3
 1/√3
 1/3
 3

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Electrical Machines
Rotating part of DC motor is known as

 Armature.
 Pole.
 Starter.
 Carbone brush.

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Electrical Machines
Commutator pitches of duplex and simplex lap windings are respectively

 2 and 1
 2 and 2
 4 and 2
 4 ang 1

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