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Electrical Machines

Electrical Machines
In a DC machine, the angle between the stator and rotor fields is

 0o.
 180o.
 90o.
 dependent upon the load.

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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/4Sa²
 PZL/4S
 PZL/ 4Sa
 PZL/4SP²

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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)

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

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Electrical Machines
Which of these types of motor is used in elevators?

 None of these.
 DC compound motor.
 DC series motor.
 DC shunt motor.

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Electrical Machines
An induction motor when started on no load does not accelerate up to full speed but runs at 1/7th of the rated speed. The motor is said to be

 plugging.
 crawling.
 cogging.
 locking.

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Electrical Machines
A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors with armature resistance of 0.6 ohm. Calculate the starting current flowing through the armature if the supply voltage is 240 volt.

  400 Amp.
 800 Amp.
 320 Amp.
  0.5 Amp.

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