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Electrical Machines

Electrical Machines
Which type of motors are preferred in lifts?

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

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Electrical Machines
Dynamic braking is very effective for

 series motors.
 separately excited motors.
 shunt motors.
 differential compound motors.

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Electrical Machines
If the field of a dc shunt motor gets opened while the motor is running, then the

 armature will oscillate about original speed as the mean speed
 motor will become slow.
 motor will attain dangerously high speed
 armature current will drop

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Electrical Machines
In a dc machine, the demagnetizing effect of armature reaction is due to

 uneven air-gap length
 magnetic saturation in half of the field pole
 component of armature mmf along field axis
 non-sinusoidal nature of armature mmf

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Electrical Machines
Which of following winding is connected in series with armature winding of DC machine?

 Commutating pole winding.
 Auxiliary winding.
 Compensating winding.
 Both Compensating and Commutating pole winding.

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Electrical Machines
If the handle of a three point starter goes to back to OFF position, it may be due to

 high filed circuit resistance.
 over load.
 all of these.
 zero or very low voltage supply.

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