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Electrical Machines

Electrical Machines
Dynamic braking is employed to brake

 reversing drive
None of these
 both 1 and 2
 non reversing drive

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Electrical Machines
If B is flux density, l the length of the conductor and v the velocity of the conductor, then emf is given by

 Blv2.
 Bl2v2.
 Blv.
 Bl2v.

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Electrical Machines
A 3-phase 6 pole 50 Hz induction motor is running at 5% slip.What is the speed of the motor?

 1000 rpm
 850 rpm
 900 rpm
 950 rpm

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Electrical Machines
In applied voltage is reduced in a dc shunt motor

 Full load torque.
  Full load current.
 Full load speed.
 None of these.

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Electrical Machines
The armature of DC machine is made of silicon steel lamination to

 increase the permeability.
 reduce hysteresis loss only.
 reduce eddy current loss only.
 reduce both eddy current and hysteresis loss.

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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

 234 V
 6 V
 240 V
 474 V

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