In a p+-n junction diode, if the minority carrier recombination rate is increased by 100 times, how will the diode current change (in magnitude)? (a) Only the forward current will increase. The reverse current will not change. (b) Only the reverse current will increase. The forward current will not change. (c) Both the forward and reverse current will increase. (d) Both the forward and reverse current will decrease. Solution: (c)

A half wave rectifier is shown below. The Diode with a constant voltage drop model (v=Von = 0.7V) Draw the input and output voltage waveforms for 0 < t < 2T. Assume that RC >> T and T >> delta T. At what time does the diode turn on? In the waveform in (a), f the cap discharges for 15msec, what is the ripple voltage and the RC time constant In the waveform in (a), if the diode conduction interval is 0.5 msec, what is the ripple voltage and the RC time constant? In the waveform in (a), if the output ripple voltage is 0.5v, what should be the RC time constant? What is the diode peak inverse voltage (PIV)? If you want to reduce the PIV of the diode by half, what would you do?

In the single-phase half-wave diode rectifier with an inductive load, if the inductor starts discharging its energy and continuous until 205 degrees, the value of inversion conduction-angle of a diode is:

4.) In which mode will a diode generally not conduct electricity? a. Bidirectional Biased b. None of these c. Forward Biased d. Reversed Biased   5.) Consider the following schematic symbol of a semiconductor device: Which side is the Cathode? (Picture inserted down below) a. Side A b. Both side A and B c. Side B d. Neither side A or B   8.) Integrated circuits can be broken down into three basic categories.  Which category does an operational amplifier (or op-amp) fall into? a. Analog b. None of these c. A combination of analog and digital d. Digital

a) What is n-type semiconductor materials? What are the majority and the minority cariers? b) What is p-type semiconductor materials? What are the majority and the minority cariers? c) What is depletion region of a p-n junction diode? d) Describe in your own words the forward-bias and reverse- bias conditions of a p-n junction diode. e) Draw a Diode Symbol and label the anode and the cathode. Si Ge 2 ka f) Find V, in the circuit shown in +20 V 2 k2 15V Fig. Fuad Al-Mannai EENG261 Page 1