Question

ans NO 2 TEE208/05 Question 1 (20 marks) (a) Sketch and label the I-V curves of: () a real germanium diode with forward voltage of 0.3V. 4 marks (i) a real sillcon zener diode with zener voltage of 4.7V. [4 marks] 4 marks] List two breakdown mechanisms for a zener diode. (b) (c) Rectifiers convert alternating current (AC) into direct current (DC). () Sketch and label the circuit of a simple half-wave rectifier. [3 marks] (U) Explain two differences between a simple half-wave rectifier and a bridge rectifier [5 marks]

Answer 1

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C)ii)

No Half-Wave Rectifier Full Wave Rectifier Full wave Bridge Rectifier centre taped 2. In this, one diode or one In this, two diodes or one In this four junction diodes semiconductor diode s double diode or two from the bridge circuit. used 3. Ordinary transformer s Centre tap transformer is Transformer not unction diodes are used used uired used 4. It converts half cycle ofIt converts the whole cyclet converts the whole cycle applied A.C. signal into of applied A.C. signal into of applied A.C. signal into D.C. signal D.C. signal Input and output curves Input and output curves D.C. signal 5. Input and output curves us ort The value of Ima 7 21 212 de de 8. The value of ripple factor is The value of r in it is The value of r in it is 48.2% 48.2% r-ma-1 121% 9. | Efficiency (n) 40.6 Its efficiency is 81.2% 81.2 (α) η (α) η (b) when r,-R, then η When r = R, then η = | 40.6%

Consider half wave rectifier and bridge rectifier