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Electrical Machines

Electrical Machines
Which of the following DC generators has rising V-I characteristics?

  Compound.
  Series.
  Shunt.
  None of them.

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Electrical Machines
When a DC cummulative compound wound motor is loaded

  Torque increase and speed decrease.
 Torque decrease and speed increases.
 Torque and speed both increase.
 Both torque and speed decrease.

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Electrical Machines
The main purpose of providing tertiary winding in a three phase transformer is

  to suppress harmonic and unbalance in voltage.
 to interconnect three voltage systems.
 to carry extra load.
None of these

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

 4 and 2
 2 and 1
 4 ang 1
 2 and 2

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Electrical Machines
The slip of an induction motor normally does not depend on which of the following?

 Synchronous speed.
 Shaft torque.
  Core loss component.
 Rotor speed.

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Electrical Machines
Secondary winding of an auto transformer is also called

  common winding.
 compensating winding.
 damping winding.
 tertiary winding.

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