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Transfer of electric power from primary to secondary in a transformer takes place A electrically B magnetically C electro-magnetically D conductively
2 8087Resistance of low voltage side of transformer compared to high voltage side is A less B equal C more D depens on design
1 5801As load in a transformer increases, mutual flux linkage in core= A increases B decreases C not change D first increase then decrease
2 8484Are we do it in single transformer with dual primary as 11 KV and 33 KV and constant output as 415 Volts?.
1 3306In 3 phase induction motor even with low Voltage it reaches nearly it's rated speed why? (for example instead of 400V it reaches with 250V)
2 483977 In constant power region of 3-phase IM torque-speed characteristics, the torque is proportional to A speed B slip C 1/speed D 1/slip
1 2866In constant power region of 3-phase IM torque-speed characteristics, if frequency increases slip A does not alter B decreases C increases D none of above
1 2117In constant power region of 3-phase IM torque-speed characteristics, if frequency increases flux A does not alter B decreases C increases D none of above
1 2306In constant power region of 3-phase IM torque-speed characteristics, if frequency increases voltage A does not alter B decreases C increases D none of above
1 2874Stator of 3-phase IM has 3 slots per pole per phase. If supply frequency is 50 Hz, calculate the speed of rotating stator flux A 1000 rpm B 500 rpm C 1500 rpm D 1440 rpm
1 2248Stator of 3-phase IM has 3 slots per pole per phase, calculate number of stator pole pairs. A 1 B 6 C 2 D 3
2 4693A 3-phase IM is supplied from 50 Hz system. It runs at speed of 1440 rpm and slip equal to 4 %. Calculate number of pole pairs. A 1 B 6 C 2 D 3
1 2074Post New Electrical Engineering Questions
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If a current -8+6sin6t is flowing three ammeter, one is a centre zero PMMC meter, one is true rms meter and one is moving iron meter. What are the reading of these three meter respectively?
Q.1:What protection will be used on HT and LT side of 33/0.4 KV, MVA transformer. Indicate capacities of protective device to be used. Q.2:Which types of back-up protections are used in the power transformers? What do you understand by the term over travel in the relay? Q.3:How star and delta connected winding transformer are provided from earth fault
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