b) The input voltage, Vin(t) = 15 sin(400mt) V is connected to four silicon zener diodes as shown in Figure 6b. Zener voltages are Vz1 = 6,8 V, Vz2 = 3,3 V, Vz3 = 4.7 V, Vz4 = 5.1 V. VF = 0.7 V for all the silicon zener diodes. (i) Briefly explain how the output voltage, vo(t) is obtained during the positive and negative half cycles. (ii) Sketch and label 2 cycles of the output voltage waveform, vo(t). Indicate the period, maximum voltage and minimum voltage.

Question 2: Make the sentences passive. 1- They export oil from France and Germany. 2- They collected the rubbish last week. 3- They're counting the money at the moment. 4- They have arrested hundreds of burglars over the past six months. 5- They had already given the job to someone else by the time I arrived. (10 marks)

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14] Encode Decimal '-124' using Two's Complement. Express your answer in Hex. 15] How much Current is passing through a 470 ohm Resistor that is dropping 3.3 Volts? Express your answer in Decimal with 2 digits of significance.  16] How many Volts are being dropped by a 2.7k Ohm Resistor if it is passing 75uA? Express your answer in Decimal with 2 digits of significance.