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Electrical Machines

Electrical Machines
In DC motors, under trailing pole tips, flux density will_______ ?

 decrease
 either increase or decrease
 increase
None of these

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Electrical Machines
In auto transformer if the turn ratio is K, what is the power transferred inductively?

 (1-K) × input power
 both A and B
None of these
 K × input power

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Electrical Machines
When a DC cummulative compound wound motor is loaded

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

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Electrical Machines
The three point starter is used for

  Shunt motor as well as compound motors.
  Series motor.
  Shunt, compound and series motor.
  Shunt motor.

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Electrical Machines
If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be

 250 rpm
 1000 rpm
 2000 rpm
 500 rpm

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Electrical Machines
Which of the following is/are the methods to reduce the armature reaction and its effects?

 compensating winding
 pole stacking
 pole chamfering
All of these

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