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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?

 45°
 30°
 60°
 10°

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Electrical Machines
In a seperately excited DC Motor if field current is increased, it will

 Increase speed
 Reduce armature heating.
 Reduce starting torque.
 Increase acceleration duration.

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Electrical Machines
A 3-phase, 2 pole, 12 slot synchronous machine is operating at synchronous speed. Find the slot angle?

 18°
 60°
 20°
 30°

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Electrical Machines
In case of DC Shunt Motor electromagnetic torque developed is

 None of above.
 Proportional to the armature current.
 Proportional to the square of armature current.
 Inversely proportional to the armature current.

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Electrical Machines
In field flux method speed control of DC Motor is

 constant power drive above base speed.
 constant torque drive below the base speed.
 constant torque drive above the base speed.
 constant hp drive below the base speed.

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Electrical Machines
In auto transformer if the turn ratio is K, what is the power transferred inductively?

None of these
 K × input power
 both A and B
 (1-K) × input power

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