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Electrical Machines

Electrical Machines
A 3 phase stepper motor has 6 stator poles and 4 rotor poles, then find the step angle?

 60°
 10°
 45°
 30°

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Electrical Machines
In normal dc machines operating at full-load conditions, the most powerful electromagnet is

 field winding
 interpole and compensating windings together
 armature winding
 interpole winding

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Electrical Machines
Quadrature axis synchronous reactance is the ratio of

 Vmin to Imax.
 Vmax to Imin.
 Vmax to Imax.
 Vmin to Imin.

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Electrical Machines
Which type of motors are used for lathes?

 Either A or B.
 Synchronous motor.
 DC shunt motors.
 Cage induction motor.

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Electrical Machines
In a DC series generator, the terminal voltage with increase in load will

 increase to rated voltage and then may decrease
 remain nearly constant
 decrease
 increase gradually and then stay at rated voltage

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Electrical Machines
A 8-pole, DC generator has a simplex wave-wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 Wb. The machine is running at 250 rpm. The induced armature voltage is

 384 V
 96 V
 192 V
 768 V

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