Tiêu đề 1. Basics Of Electronics Solved Jan 2016.pdf ✅

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PART A 1. Differentiate relays and contactors and write the applications of each. Relay Contactor Relatively smaller in size. Larger when compared to relays. Used in circuits with lower ampacity. (Max 20A) Used in circuits with low and higher ampacity up to 12500A. Mainly used in control and automation circuits, protection circuits and for switching small electronic circuits. Used in the switching of motors, capacitors, lights etc. Consists of at least two NO/NC contacts. Consists of minimum one set of three phase power contacts and in some cases additional auxiliary contacts are also provided. 2. What is tolerance of a resistor? Find the resistance range for the carbon resistor having the colour bands: yellow, violet, red and gold. Tolerance is the percentage of error in the resistor's resistance, or how much more or less you can expect a resistor's actual measured resistance to be from its stated resistance. A gold tolerance band is 5% tolerance, silver is 10%, and no band at all would mean a 20% tolerance. Resistance range of the given color band is 4.7K  5%. 3. Write any four applications of electronics in the field of defense.  Electronic circuits provide a means of secret communication between the head- quarter and different units  RADAR that is Radio Detection and Ranging is the most important development in electronics field. With the help of radar, it is possible to detect and find the exact location of enemy aircraft, Radar and anti-craft guns can be linked by an automatic control system to make a complete unit  Circuit boards and sub-assemblies for military firing simulators (anti-tank)  Electrical distribution circuit boards for military helicopters 4. Draw the energy band diagrams of insulator, semiconductor and conductor. KTUQBANK.COM
5. How does an Avalanche breakdown differ from Zener break down? Zener break down Avalanche breakdown 1.This occurs at junctions, which being heavily doped have narrow depletion layers. 1. This occurs at junctions which being lightly doped has wide depletion layers. 2. This breakdown voltage sets a very strong electric field across this narrow layer. 2. Here, electric field is not strong enough to produce Zener breakdown. 3. Here, electric field is very strong to rupture the covalent bonds thereby generating electron hole pairs. So even a small increase in reverse voltage is capable of producing large number of current carriers, i.e. why the junction has a very low resistance. This leads to Zener breakdown 3. Here, minority carriers collide with semiconductor atoms in the depletion region, which breaks the covalent bonds and electron-hole pairs are generated. Newly generated charge carriers are accelerated by the electric field, which results in more collision and generates avalanche of charge carriers. This results in avalanche breakdown. 6. Write the type number of the following: a) Low frequency low power transistor, b) High frequency low power transistor, c) Power Transistor, d) Rectifier Diode. Low frequency low power transistor= AC540 High frequency low power transistor=AF125 Power Transistor=TO220 Rectifier Diode Model Number Diode Type Peak Inverse Voltage Current 1N4001 Rectifier 50 V 1 A 1N4002 Rectifier 100 V 1 A KTUQBANK.COM