Electrical Machines A delta/star transformer is connected in parallel to a star/delta transformer. The turn ratio former is x times latter, the x is 1/3 √3 1/√3 3 1/3 √3 1/√3 3 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In DC generator, which component plays the vital role to produce the direct current? Armature. Brush. Yoke. Commutator. Armature. Brush. Yoke. Commutator. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Compensating windings are used in DC generators to neutralize the cross magnetizing effect of the armature reaction. None of these mainly to reduce the eddy currents by providing local short circuit. to provide path for the circulation of cooling air. to neutralize the cross magnetizing effect of the armature reaction. None of these mainly to reduce the eddy currents by providing local short circuit. to provide path for the circulation of cooling air. ANSWER DOWNLOAD EXAMIANS APP
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 remain unchanged be more than 10% be less than 10% be 12.5% remain unchanged be more than 10% be less than 10% be 12.5% ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the armature electric current is increased to double its previous value, and the time of commutation is halved, how will the reactance voltage vary? It will remain the same. It will be doubled. It will becomes four times. It will be halved. It will remain the same. It will be doubled. It will becomes four times. It will be halved. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is 0.95 1.06 0.87 0.96 0.95 1.06 0.87 0.96 ANSWER DOWNLOAD EXAMIANS APP
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