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In a D.C. machine, short-circuited field coil will result in?

Recent questions tagged excitation

1 answer 27 views

In a synchronous generator if the excitation increased from a low value to normal value, with a fixed load  (A) The armature current increases and the power factor decreases  (B) The armature current decreases and the power factor also decreases  (C) The armature current decreases and the power factor increases but is lagging  (D) The armature current decreases and the power factor increases and is leading

asked Apr 29, 2018 in Electrical Machine by Shimroz123
1 answer 38 views

For a 500 Hz frequency excitation, a 50 km long power line will be modeled as

asked Apr 29, 2018 in Power system by Shimroz123
1 answer 152 views

The effect of increasing load on a synchronous motor running with normal excitation is (A) Increase both its Ia and power factor. (B) Decrease Ia, but increase power factor. (C) Increase Ia, but decrease power factor (D) Decrease both Ia and power factor.

asked Apr 28, 2018 in Electrical Machine by Shimroz123
1 answer 23 views

While keeping the excitation constant, if the steam supply of an alternator running in parallel with another identical alternator is increased, then (A) It would over-run the other alternator (B) Its rotor will fall back in phase with respect to the other machine (C) Its portion of share in load will increase (D) Its power factor would be decreased.

asked Apr 28, 2018 in Electrical Machine by Shimroz123
1 answer 24 views

If we change the excitation of synchronous machine will it affect on power factor?

asked Mar 18, 2018 in Synchronous machine by Shimroz123
1 answer 18 views

If we change the excitation of synchronous machine will it affect on motor speed?

asked Mar 18, 2018 in Synchronous machine by Shimroz123
1 answer 146 views

what will happen when excitation of an unloaded salient pole synchronous motor suddenly gets disconnected?

asked Mar 18, 2018 in Synchronous machine by Shimroz123
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