ENG3012 Engineering Science B AY 2021/22 Examination - Semester 2 B3. (a) Given the magnetic circuit below: Mean Path Le

[answerhappygod]

Eng3012 Engineering Science B Ay 2021 22 Examination Semester 2 B3 A Given The Magnetic Circuit Below Mean Path Le 1 (58.5 KiB) Viewed 20 times

ENG3012 Engineering Science B AY 2021/22 Examination - Semester 2 B3. (a) Given the magnetic circuit below: Mean Path Length P = 40 cm 12 A Cross-Sectional Area A= 12 cm 250 turns coil Fig. B4(a) (i) Determine the magnetomotive force (MMF) produced by the coil; (3 marks) (ii) Calculate the average magnetic field strength (H) in the ring; (3 marks) (iii) If the relative magnetic permeability (Mr) of the ring material is 1200, find the average magnetic flux density (B) in the ring. Given uo = 410 x 10-7 H/m. (3 marks) (iv) Determine the total flux (Ø) in the ring; (2 marks) (b) A circuit consists of one ideal rectifier diode and a transformer is shown in Fig B4(b). Determine: 15:1 D1 Vpri RL VSEC 25Vrms "TVAL TX1 Fig. B4(b) (i) the peak voltage at RL, VRL(p) and (2 marks) (ii) the primary voltage Vprijin RMS value. (2 marks) Page 5 of 7