Electrical Machines The sparking at the the brushes, in a DC machines is due to presence of commutator. high resistance of carbon brushes. armature reaction. reactance voltage. presence of commutator. high resistance of carbon brushes. armature reaction. reactance voltage. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Ideal value of voltage regulation of a device is? a finite negative value ∞ a positive finite value 0 a finite negative value ∞ a positive finite value 0 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The material used for commutator brushes is mostly carbon. cast iron. copper. mica. carbon. cast iron. copper. mica. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If a DC Series motor is connected across an AC supply it will run at lower speed. burn. run at normal speed. not run. run at lower speed. burn. run at normal speed. not run. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The total core loss of a 400 V, 50 Hz transformer is 2400W, when it is supplied by 200 V, 25 Hz loss is 800W. Calculate eddy current loss and hysteresis loss? 1400W, 1000W 1000W , 1400W 800W, 1600W 1600W, 800W 1400W, 1000W 1000W , 1400W 800W, 1600W 1600W, 800W ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Hysteresis loss will depends on f² f1.6 f f³ f² f1.6 f f³ ANSWER DOWNLOAD EXAMIANS APP
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