Module04-New.doc - Module 04.(B1) Electronic Fundamentals...

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Unformatted text preview: Module 04.(B1) Electronic Fundamentals 1.1a. Semiconductors - Diodes. Question Number. 1. What gives the colour of an LED?. Option A. The active element. Option B. The plastic it is encased in. Option C. The type of gas used inside it. Correct Answer is. The active element. Explanation. The active element is the element used in the doping of the semiconductor material. Aircraft Electricity and Electronics 5th Edition Eismin Page 121. Question Number. 2. A germanium diode is used for. Option A. rectification. Option B. voltage stabilization. Option C. modulation. Correct Answer is. rectification. Explanation. Germanium diode has the least forward bias voltage drop and is best for rectification. Question Number. 3. Why is a diode put in parallel with an LED?. Option A. To protect it from AC. Option B. So it will work only above a certain voltage. Option C. So it will work only below a certain voltage. Correct Answer is. To protect it from AC. Explanation. An LED has a high forward bias voltage drop but is easily damaged when reverse biased. AC is therefore not good for an LED. Question Number. 4. When testing the forward bias of a diode with a multimeter. Option A. the positive lead of the ohmmeter is placed on the anode. Option B. it does not matter which terminal the positive lead of the ohmeter is placed. Option C. the positive lead of the ohmmeter is placed on the cathode. Correct Answer is. the positive lead of the ohmmeter is placed on the anode. Explanation. To test forward bias, the positive lead of the multimeter must be placed on the anode. Note: If the question says 'moving coil meter' then it would be the negative lead on the anode, since the negative side of the battery in such a meter is connected to the + lead. Aircraft Electricity and Electronics 5th Edition Eismin Page 113. Question Number. 5. This is a diagram of. Option A. an SCR. Option B. a TRIAC. Option C. a Schottky diode. Correct Answer is. an SCR. Explanation. NIL. Question Number. 6. Which of the following describes the characteristics of a Thyristor?. Option A. High voltage handling. Option B. High power handling. Option C. High current handling. Correct Answer is. High current handling. Explanation. A thyristor (such as an SCR) is a high current switching. Question Number. 7. Light Emitting Diodes (LEDs). Option A. emit light of only one wavelength dependent on type. Option B. have very wide viewing angles. Option C. are easily damaged if forward biased b more than 5V. Correct Answer is. emit light of only one wavelength dependent on type. Explanation. NIL. Question Number. 8. In a semiconductor junction diode, electrons are the minority carriers. Option A. within the P region....
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This note was uploaded on 03/09/2011 for the course AIRCRAFT 2008.09.00 taught by Professor Dr.alan during the One '11 term at TAFE NSW - Sydney Institute.

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Module04-New.doc - Module 04.(B1) Electronic Fundamentals...

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