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Electrical Machines

Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 2.5Hz
 50Hz
 2HZ
 1 Hz

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be

 240 V
 234 V
 474 V
 6 V

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Electrical Machines
For a DC Shunt Motor having armature resistance of 0.5 Ω and 2A armature current at no-load, when the armature current is changed to 20A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load?

 1037.5 r.p.m.
 1130 r.p.m.
 963.8 r.p.m.
 4575.4 r.p.m.

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Electrical Machines
Secondary winding of an auto transformer is also called

 tertiary winding.
  common winding.
 damping winding.
 compensating winding.

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Electrical Machines
Eb/V ratio of a DC motor is an indication of

 Speed regulation.
  Effiency.
 Starting torque.
 Running Torque.

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Electrical Machines
No load saturation characteristics are plotted between

 short circuit current and armature current
 no load voltage and armature current
 no load voltage and field current
 short circuit current and field current

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