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Electrical Machines

Electrical Machines
The armature voltage control is considered suitable for a DC motor driven at constant

 torque.
 speed.
 power.
 current.

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

 45°
 10°
 60°
 30°

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Electrical Machines
A commutator in dc machine provide ----------------- rectification?

 half wave controlled
 half wave
 full wave
 full wave controlled

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Electrical Machines
Which of the following motors is/are widely used?

 squirrel cage induction motor
 slip ring induction motor
 either of these
None of these

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Electrical Machines
If we increase the rotor reactance value, the maximum torque will

 not changed
 decrease
 increase
None of these

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Electrical Machines
A dc shunt generator has full-load voltage regulation of 10% at rated speed of 1000 rpm. If it is now driven at 1250 rpm, then its voltage regulation at full load would

 be more than 10%
 be less than 10%
 be 12.5%
 remain unchanged

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