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Electrical Machines

Electrical Machines
When maximum flux density is constant, the eddy current losses are proportional to

 V2
 V
 f2
 f

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Electrical Machines
For a DC machine having P no of pole pairs Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance for lap-winding ?

 PZL/4SP²
 PZL/4Sa²
 PZL/ 4Sa
 PZL/4S

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Electrical Machines
Shunt field of DC generators consists of--------number of turns and ---------- conductors respectively

 less and thin
 less and thick
 large and thin
 large and thick

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Electrical Machines
The speed of rotating magnetic field of 8 pole 50 Hz induction motor is

 3000 rpm
 1000 rpm
 1500 rpm
 750 rpm

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Electrical Machines
If in DC Shunt Motor the flux is reduced suddenly to zero, then

 the speed of motor will be reduced.
 the motor will attain dangerously high speed.
 the armature current will reduce.
 the motor will come to stop.

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Electrical Machines
From no load to full load the slip will

None of these
 not change.
 slightly decrease.
 slightly increase.

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