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Electrical Machines

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

 increase
 decrease
None of these
 either increase or decrease

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Electrical Machines
The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?

 19%
 10%
 40%
 5%

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Electrical Machines
For larger units high torque it is preferred to use

 Slip induction motor.
 Universal motor.
 DC shunt motor.
 Partial motor.

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Electrical Machines
In DC machine yoke offers

 both A and B
 mechanical protection to the machine
 produce working flux
 flux path completion

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Electrical Machines
For the same power output rating and full load speed, the motor will have poorest starting torque, is

 Cummulative compound.
 Differential compound.
  Shunt.
 Series.

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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor

 None of these.
  Decrease.
 Increase.
 Remains same.

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