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Electrical Machines

Electrical Machines
In DC machine torque depends on which of the following?

 speed
 flux (φ)
 both A and B
 armature current (I)

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Electrical Machines
In case of DC Shunt Motor, the speed will____ if the voltage increases, neglecting armature saturation.

 decrease.
 remain the same.
 be unpredictable.
 increase

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Electrical Machines
The field divertor resistance for a DC series motor is of order of

 100 Ω
 0.1 Ω
 50 Ω
 10 Ω

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

 60°
 45°
 10°
 30°

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Electrical Machines
Compensating winding is placed in the

All of these
 main field
 armature core
 pole shoe

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Electrical Machines
A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be

 0.72.
 0.25.
 0.62.
 1.24.

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