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Electrical Machines

Electrical Machines
Which motor cannot be started on no load?

 shunt motors
 cumulative compound motors
 both B and C
 series motors

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Electrical Machines
Which of the DC Motor use flywheel?

 Differently compared motor.
 Series motor.
 Shunt motor.
 Cumulatively compound motor.

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Electrical Machines
The rotor speed of an induction motor is given by

None of these
  Nr = 120f / p × (1-s).
  Ns = 120f /p × ( 1 - r).
  Ns = 120f / p × ( 1 - s ).

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Electrical Machines
A dc shunt motor runs at a no-load speed of 1140 rpm. At full load, armature reaction weakens the main flux by 5% whereas the armature circuit voltage drops by 10%. The motor full-load speed in rpm is

 1000
 1080
 1203
 1200

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Electrical Machines
The type of DC motor generally used for shears and punches is

 Shunt motor.
 Differential compound motor.
 Series motor.
 Cummulative compound motor.

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Electrical Machines
Select the motor that should not be started on no load?

 Brushless DC motor.
  Series motor.
 Shunt motor.
 Compound motor.

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MORE MCQ ON Electrical Machines

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