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Electrical Machines

Electrical Machines
DC shunt motors are suitable for

 Blowers and fans.
 Lathes.
 Centrifugal pumps
  All of this.

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Electrical Machines
In a DC machine, which of these parameters remain the same whether it runs as a DC motor or a DC generator?

 Induced emf.
 Mechanical power.
 Armature current.
 Can not be determined.

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Electrical Machines
In an induction motor, the no-load slip is generally equal to

  less than 1 %.
 4 %.
 1.5 %.
  zero.

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

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

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Electrical Machines
In which of the following, voltage regulation may be zero or negative

All of these
 unity power factor
 lagging power factor
 leading power factor

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Electrical Machines
What is the increase in the torque expressed as percentage of initial torque, if current drawn by the dc series motor is increased from 10A to 11A?

 21%
 10%
 41%
 11%

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