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Electrical Machines

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

 torque.
 current.
 power.
 speed.

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Electrical Machines
Which of these types of motor is used in elevators?

 None of these.
 DC compound motor.
 DC series motor.
 DC shunt motor.

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Electrical Machines
Hopkinss test in DC motor is conducted at ?

 Low load.
 None of these.
  Full load.
 No load.

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Electrical Machines
In DC generator, which component plays the vital role to produce the direct current?

  Commutator.
 Yoke.
 Brush.
 Armature.

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Electrical Machines
In an auto transformer, for what value of turn ratio, power transferred by inductively and conductively are same?

 0.5
 1
 any of the above
 0

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Electrical Machines
A 3-phase slip ring induction motor is wound for 4 poles on stator and 6 poles on the rotor. When 3-phase balanced voltage source at 50 Hz is applied, it will run at

 1000 rpm
 zero speed
 750rpm
 1500 rpm

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