In a dc generator operating on load with its brushes on the geometrical neutral axis (GNA), the magnetic neutral axis (MNA) is shifted in the direction of rotation. Now, if the brushes are given a lead of 90° (electrical), then the MNA will

Electrical Machines
In a dc generator operating on load with its brushes on the geometrical neutral axis (GNA), the magnetic neutral axis (MNA) is shifted in the direction of rotation. Now, if the brushes are given a lead of 90° (electrical), then the MNA will

coincide with the GNA

shift forward by more than 90°

shift forward by less than 90°

shift forward by 90°

coincide with the GNA

shift forward by more than 90°

shift forward by less than 90°

shift forward by 90°

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Electrical Machines
In a DC generator the emf generated by the armature is maximum when

induced voltage is high.

shaft rotation is high.

rate of change of flux is minimum.

rate of change of flux is maximum.

induced voltage is high.

shaft rotation is high.

rate of change of flux is minimum.

rate of change of flux is maximum.

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Electrical Machines
The wound rotor type IM is used for____________ speed operation.

maximum.

constant.

variable.

minimum.

maximum.

constant.

variable.

minimum.

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Electrical Machines
Find the developed torque DC Series Motor having armature resistance of 0.2 Ω and taking armature current of 60 A is connected to 250 V supply. Considered brush drop of 1 V each.

cant be determined.

234.76 N-m.

133.22 N-m

266.20 N-m.

cant be determined.

234.76 N-m.

133.22 N-m

266.20 N-m.

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Electrical Machines
_____________ types of induction motor are widely used.

Three phase IM.

Slip ring IM.

Single phase IM.

Squirrel cage IM.

Three phase IM.

Slip ring IM.

Single phase IM.

Squirrel cage IM.

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Electrical Machines
In DC machines, the interpoles are provided

to make commutation spark less.

to counteract the reactance voltage and the cross-magnetizi

both (B) and (C).

to counteract demagnetizing effect of armature mmf in commutating zone.

to make commutation spark less.

to counteract the reactance voltage and the cross-magnetizi

both (B) and (C).

to counteract demagnetizing effect of armature mmf in commutating zone.

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Electrical Machines

Electrical Machines In a dc generator operating on load with its brushes on the geometrical neutral axis (GNA), the magnetic neutral axis (MNA) is shifted in the direction of rotation. Now, if the brushes are given a lead of 90° (electrical), then the MNA will

Electrical Machines In a DC generator the emf generated by the armature is maximum when

Electrical Machines The wound rotor type IM is used for____________ speed operation.

Electrical Machines Find the developed torque DC Series Motor having armature resistance of 0.2 Ω and taking armature current of 60 A is connected to 250 V supply. Considered brush drop of 1 V each.

Electrical Machines _____________ types of induction motor are widely used.

Electrical Machines In DC machines, the interpoles are provided

Electrical Machines
In a dc generator operating on load with its brushes on the geometrical neutral axis (GNA), the magnetic neutral axis (MNA) is shifted in the direction of rotation. Now, if the brushes are given a lead of 90° (electrical), then the MNA will

Electrical Machines
In a DC generator the emf generated by the armature is maximum when

Electrical Machines
The wound rotor type IM is used for____________ speed operation.

Electrical Machines
Find the developed torque DC Series Motor having armature resistance of 0.2 Ω and taking armature current of 60 A is connected to 250 V supply. Considered brush drop of 1 V each.

Electrical Machines
_____________ types of induction motor are widely used.

Electrical Machines
In DC machines, the interpoles are provided