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Electrical Machines

Electrical Machines
A delta/star transformer is connected in parallel to a star/delta transformer. The turn ratio former is x times latter, the x is

 1/√3
 1/3
 √3
 3

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Electrical Machines
A differentially compound motor under high-over-load conditions will behave like a / an

 cummulative compound motor.
 shunt motor.
 AC synchronous motor.
  series motor.

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Electrical Machines
Which type of motors are preferred in lifts?

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

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Electrical Machines
In a DC compound motor the field regulator is provided to

 demagnetize the field partially.
 control the field flux.
 limit the armature current.
 control the armature flux.

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Electrical Machines
The oscillation in a synchronous motor can be damped out by

  running the motor on leading power factors.
  oscillation cannot be damped.
  providing damper bars in the rotor pole faces.
  maintaining constant excitation.

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Electrical Machines
Slip test is performed to determine

 direct axis reactance and quadrature axis reactance
 positive sequence reactance and negative sequence reactance
 slip
All of these

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