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Electrical Machines

Electrical Machines
For a dc machine shunt resistance and armature resistance values are

 high and high
 high and low
 low and low
 low and high

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Electrical Machines
The back emf produced in a dc motor depends on

  P.
  Z.
  P and Z.
  none of these.

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Electrical Machines
A frog leg winding is used in a DC machine to eliminate

  the use equalizer in lap winding.
 the use drum winding.
 the use of compensating winding.
 reactance voltage produced due to communication.

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Electrical Machines
The armature voltage control is considered suitable for a DC motor driven at constant

 power.
 current.
 speed.
 torque.

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Electrical Machines
Generators work on the principle of production of

None of these
 dynamically induced emf.
 statically induced emf.
 dynamically and statically induced emf.

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

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

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