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Electrical Machines

Electrical Machines
The wound rotor type IM is used for____________ speed operation.

  minimum.
  constant.
  maximum.
  variable.

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Electrical Machines
Commutator pitches of duplex and simplex lap windings are respectively

 4 ang 1
 2 and 1
 4 and 2
 2 and 2

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Electrical Machines
If the field circuit of a DC shunt motor is opened

 The speed of motor will be reduced.
 DC Shunt Motor
  The motor will attain dangerously high speed.
 The armature current will reduce.

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Electrical Machines
Reactive power generated or delivered significantly depends on

 frequency.
 both 1 and 2.
 load angle.
 excitation.

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Electrical Machines
In case of a compensated DC series motor, the compensating winding is provided

  In series with the armature winding.
 As a separate unit.
 In parallel with the armature winding.
 In parallel with the field winding.

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Electrical Machines
Diverters are used only in

 either of these
 shunt motors
 series motors
None of these

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