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Electrical Machines

Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 90°
 25° to 30°
 70° to 85°
 0°

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Electrical Machines
Flux density under leading pole tips in case of generator will

None of these
 decrease
 increase
 either increase or decrease

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Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

 200 V.
 230 V.
 115 V.
 460 V.

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Electrical Machines
Ideal value of voltage regulation of a device is?

 a positive finite value
 a finite negative value
 ∞
 0

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Electrical Machines
Satisfactory commutation of DC machine requires

 brushes should be of proper grade and size.
 brushes should smoothly run in the holders.
All of these
 smooth, concentric commutator properly undercut.

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Electrical Machines
To increase starting torque of a 3-phase slip ring induction motor, preferred method is to increase

 supply frequency
None of these
 supply voltage
 rotor resistance

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