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Electrical Machines

Electrical Machines
A DC generator beyond critical resistance will generate

 maximum power.
 maximum voltage.
 maximum current.
 no voltage.

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Electrical Machines
A 4 pole 50 Hz 1-phase induction motor is running at 1470 rpm. Find the forward and backward slips?

 0.02, 0.98
 0.02, 1.98
 0.04, 1.96
 0.04, 0.96

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Electrical Machines
Series field consists of--------number of turns and ---------- conductors respectively

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

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Electrical Machines
What are the starters used for starting of cage motors?

 Auto transformer starter.
  All of these.
 Star-delta starter.
 DOL starter.

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Electrical Machines
A three phase 400 V, 6 pole, 50 Hz, squirrel cage induction motor is running at a slip of 5%. The speed of stator magnetic field with respect to rotor magnetic field and speed of rotor w.r.t stator magnetic field are

 zero, 950 rpm.
 1000 rpm, 950 rpm.
 1000 rpm, - 50 rpm.
 zero , - 50 rpm.

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Electrical Machines
In above questions, find the power delivered by each of the alternators to a load of impedance 6Ω(resistive)

 1000 W, 5040 W.
  3190 W, 5040 W.
 100 W, 2000 W.
 6000 W, 7000 W.

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