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Electrical Machines

Electrical Machines
A 4 pole dc generator is running at 1500 rpm the frequency of current in the armature winding is

 100Hz.
 200Hz.
 50Hz.
 150Hz.

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Electrical Machines
DC series motor is best suited for electric traction as

  It develops high starting torque.
 It runs at very high speed at light load.
 It is cheaper in cost.
 It consume less power.

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Electrical Machines
The no load and full load speed of DC motor are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor ?

 15.30%.
 14.28%.
 16.67%.
 18.25%.

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Electrical Machines
A separately-excited dc motor has an armature resistance of 0.5 Ω. It runs off a 250 V dc supply Drawing an armature current of 20 A at 1500 rpm. The torque developed for an armature current Of 10 A, for the same field current, will be

 15.28 Nm
 15.6 Nm
 15.92 Nm
 16.55 Nm

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Electrical Machines
The primary and secondary windings of a transformer are

 electrically linked.
 mechanically linked.
  inductively linked.
  conductively linked.

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Electrical Machines
In DC generator, lap winding is used in

 where constant speed is required.
 high voltage and low current applications.
  high current and low voltage applications.
 where greater load is connected.

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