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Electrical Machines

Electrical Machines
In a single phase induction motor, the starting torque developed is proportional to

 V²
 1/V²
 1/V
 supply voltage V

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Electrical Machines
In above questions, find the power delivered by each of the alternators to a load of impedance 6Ω(resistive)

  3190 W, 5040 W.
 6000 W, 7000 W.
 1000 W, 5040 W.
 100 W, 2000 W.

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Electrical Machines
The mechanical power is developed by a DC motor is maximum when

 back emf is equal to half of applied voltage.
 none of above.
 back emf is equal to applied voltage.
 back emf is equal to twice of applied voltage.

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Electrical Machines
Which of the following motor has negative speed regulation?

 Cumulative compound motors
 Differential compound motor
 Series motor
 Shunt motor

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Electrical Machines
In the V curve shown in figure below for a synchronous motor, the parameter of Y and X coordinates are, respectively

 Armature current and torque.
 Torque and field current.
 Power factor and field current.
  Armature current and field current.

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Electrical Machines
The emf induced in the dc generator armature winding is

 DC
 AC
 AC and DC
None of these

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MORE MCQ ON Electrical Machines

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