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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°
 45°
 30°
 10°

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Electrical Machines
In salient pole synchronous machine, if direct axis reactance and quadrature axis reactance is equal, then power developed due to reluctance is

 infinite value
 zero
 maximum
 any of the above

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Electrical Machines
Which of the following is/are not a self starting motor?

 both 1 and 2
 3-phase induction motor
 1-phase induction motor
None of these

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Electrical Machines
In a DC generator, if P be the number of poles and N be the rpm of the rotor, then frequency of magnetic reversals will be

 PN/60.
 PN/3000.
 PN/120.
 PN/2.

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Electrical Machines
If starter is not used with large DC motor for starting, it will

 damage the armature and commutator.
 draw a starting current many times its rated full load current.
 provide execessive voltage drop in line.
 all of above.

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Electrical Machines
To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be

 30°
 18°
 72°
 36°

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