Electrical Machines In a DC generator, the ripples in the direct emf generated are reduced by employing commutator with large number of segments. graphite brushes. equalizer rings. carbon brushes. commutator with large number of segments. graphite brushes. equalizer rings. carbon brushes. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 4 pole DC generator rotates at 1500 rpm. How many times in a second, will the emf induced in each armature conductor changes its direction? 100. 500. 200. 750. 100. 500. 200. 750. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Under which of the following conditions hunting of synchronous motor is likely to occur ? Periodic variation of load. Over-loading for long period. Small and constant load. Over-excitation. Periodic variation of load. Over-loading for long period. Small and constant load. Over-excitation. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In which transformer, the tertiary winding is used? Star - star Delta - delta Delta - star Star - delta Star - star Delta - delta Delta - star Star - delta ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A commutator in DC machines can 1. provide half-wave rectification 2. Provide full-wave rectification 3. convert ac to dc 4. Convert dc to ac 5. provide controlled full-wave rectification From these, the correct answer is 2, 3, 4, 5 2, 3, 4 2, 3 ,5 1, 2, 3 2, 3, 4, 5 2, 3, 4 2, 3 ,5 1, 2, 3 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Series field consists of--------number of turns and ---------- conductors respectively less and thin less and thick large and thick large and thin less and thin less and thick large and thick large and thin ANSWER DOWNLOAD EXAMIANS APP
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