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Electrical Machines

Electrical Machines
In which transformer, the tertiary winding is used?

 Delta - star
 Star - delta
 Star - star
 Delta - delta

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Electrical Machines
Equalizer rings are used in which of the followings?

None of these
 both 1 and 2
 wave winding
 lap winding

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Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

 100
 50
 1
 10

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Electrical Machines
Which of the following will vary the maximum torque?

 rotor resistance R
 rotor reactance X
None of these
 both 1 and 2

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Electrical Machines
The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is

  16.67 Hz.
  25 Hz.
  60 Hz.
  50 Hz.

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Electrical Machines
A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be

 0.62.
 1.24.
 0.25.
 0.72.

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