A A Current Of 5 A Flows In A Coil Wound Uniformly Around A Ring Core And Produces A Flux Of 100 Nanowebers The Ring 1 (72.23 KiB) Viewed 42 times
A A Current Of 5 A Flows In A Coil Wound Uniformly Around A Ring Core And Produces A Flux Of 100 Nanowebers The Ring 2 (77.87 KiB) Viewed 42 times
(a) A current of 5 A flows in a coil wound uniformly around a ring core and produces a flux of 100 nanoWebers. The ring core is made of mild steel, has a radius of 0.5 m and a cross-sectional area of 400 mm2. If the relative permeability of the steel is 200, find: (i) The reluctance of the mild steel. (6 marks) (ii) The number of turns on the coil. (5 marks) (iii) If the number of turns is doubled, will the reluctance be affected? (1 mark)
(b) A load with three identical coils in a star configuration is connected to a three-phase power supply. The line voltage is 400 V. The apparent and reactive power inputs are 40 kVA and 25 kVAr respectively. Answer the following questions. (i) Determine the active power. (2 marks) (ii) Determine the power factor. (2 marks) (iii) Determine the line and phase currents. (2 marks) (iv) Determine the resistance and reactance of the coils. (2 marks)
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