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A silicon PN junction is forward biased with a constant current at room temperature -gate-ece-20111 AnswerA Zener diode, when used in voltage stabilization circuits, is biased in -gate-ece-20111 AnswerA junction is made between p Si with doping density NA1 = 1015 cm3 and p Si with doping density NA2 = 1017 cm3. Given: Boltzmann constant k = 1.38 x 1023 JK1, electronic charge q = 1.6 x 1019 C. Assume 100% acceptor ionization. At room temperature (T = 300K), the magnitude of the built-in potential (in volts, correct to two decimal places) across this junction will be _________________.0 AnswerAn air-conditioner maintains the room temperature at 27 oC while the outside temperature is 47 oC. The heat conducted through the walls of the room from outside to inside due to temperature difference is 7000 W. The minimum work done by the compressor of the air-conditioner per unit time is ________ W1 AnswerFor a BJT the common base current gain α = 0.98 -gate-ece-20111 AnswerA region of negative differential resistance is observed in the current voltage characteristics of a silicon PN junction if -GATE EC 20151 AnswerThe temperature T in a room varies as a function of the outside temperature T0 and the number of persons in the room p, according to the relation T = Κ (Θp + T0 ), General aptitude GATE 20180 AnswerA p-n step junction diode with a contact potential of 0.65V has a depletion width of 1μm at equilibrium. The forward voltage (in volts, correct to two decimal places) at which this width reduces to 0.6 μm is _______.0 AnswerIf the base width in a bipolar junction transistor is doubled, which one of the following statements will be TRUE? -GATE EC 20151 AnswerFill in the blanks GATE-Instrumentation-Engineering-20141 AnswerIn the circuit shown, transistors Q1 and Q2 are biased at a collector current of 2.6mA. Assuming that transistor current gains are sufficiently large to assume collector current equal to emitter current and thermal voltage of 26 mV, the magnitude of voltage gain1 AnswerIn a tropical cyclone over the Pacific Ocean, surface pressure at 500 km from the cyclone centre is 1000 hPa. Surface pressure at the centre is 900 hPa. Sea surface temperature and surface air temperature remain constant at 28oC and 27oC, respectively. Difference in potential temperature between 500 km and cyclone centre is __________ K. (Give the answer to two decimal places.) Take g = 9.8 m s–2, Cp = 1005 J kg–1 K–1, gas constant R = 287 J kg–1 K–10 AnswerThe built-in potential of an abrupt p-n junction is 0.75V. GATE EC 20151 AnswerA solar cell of area 2 1.0 cm , operating at 1.0 sun intensity, has a short circuit current of 20 mA, and an open circuit voltage of 0.65 V. Assuming room temperature operation and thermal equivalent voltage of 26mV, the open circuit voltage (in volts, correct to two decimal places) at 0.2 sun intensity is _______.1 AnswerGive two reasons to justify- (a) Water at room temperature is a liquid. (b) An iron almirah is a solid at room temperature. CBSE- Class9- Chemistry 20131 AnswerA shock wave is moving into still air in a shock tube. Which one of the following happens to the air? (GATE-Aerospace-Engineering-2018)1 AnswerThe circuit below incorporates a permanent magnet moving coil milli–ammeter of range 1 mA having a series resistance of 10kΩ. Assuming constant diode forward resistance of 50Ω a forward diode drop of 0.7 V and infinite reve1 AnswerA student wants to use two p-n junction diodes to convert alternating current into direct current. Draw the labelled circuit diagram she would use and explain how it works (Physics CBSE 2018) 1 AnswerThe current in an enhancement mode NMOS transistor biased in saturation mode was measured to be 1 mA at a drain-source voltage of 5 V. -GATE EC 20151 AnswerI n an electrochemical machining of aluminium with plane parallel electrodes, the current density is 70 A/cm2. Cross-sectional area of each electrode is 3 cm2. The current efficiency (i.e., the fraction of current used for dissolution of metal) is 80%. Gram atomic weight, valency and density of aluminium are 27 gram, 3 and 2700 kg/m3, respectively. Take Faraday’s constant as 96500 Coulomb. The volumetric material removal rate (in mm3/min) is ______0 Answer
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