Semiconductor Devices PYQs Set 12 (PDF)

Set 12 of 17 · Questions 331-360 of 501

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Mere Teacher · Previous Year Questions JEE Main Physics · Semiconductor Devices · Set 12 (Q331-360)
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331. $A Zener diode, having breakdown voltage equal to 15 V, is used in a voltage regulator circuit shown in the figure. The current through the diode is [2011]$ (1) $10 mA$ (2) $15 mA$ (3) $20 mA$ (4) $5 mA$ 332. $The truth table for the circuit given in the fig. is :$ (1) $(A B Y 001011101111)$ (2) $(A B Y 001010100110)$ (3) $(A B Y 001011100110)$ (4) $(A B Y 000010101111)$ 333. $Two p-n junction diodes D_{1} and D_{2} are connected as shown in figure. A and B are input signals and C is the output. The given circuit will function as a____.$ (1) $NOR Gate$ (2) $NAND Gate$ (3) $OR Gate$ (4) $AND Gate$ 334. $The maximum distance up to which TV transmission from a TV tower of height h can be received is proportional to [2003]$ (1) $h$ (2) $h^{3/2}$ (3) $h^{1/2}$ (4) $h^{2}$ 335. $To get an output Y = 1 in given circuit which of the following input will be correct [2012] A B C$ (1) $1 0 0$ (2) $1 0 1$ (3) $1 1 0$ (4) $0 1 0$ 336. $The circuit given below represents which of the logic operations? [2006]$ (1) $NOT$ (2) $AND$ (3) $OR$ (4) $NOR$ 337. $To get an output Y = 1 from the circuit shown below, the input must be [2010] A B C$ (1) $0 1 0$ (2) $0 0 1$ (3) $1 0 1$ (4) $1 0 0$ 338. $A logic gate circuit has two inputs A and B and output Y. The voltage waveforms of A, B and Y are shown below The logic gate circuit is$ (1) $AND gate$ (2) $OR gate$ (3) $NOR gate$ (4) $NAND gate$ 339. $Choose the correct waveform that can represent the voltage across R of the following circuit, assuming the diode is ideal one:$ (1) (2) (3) (4) 340. $A npn transistor conducts when [2003]$ (1) $Both collector and emitter are positive with respect to the base$ (2) $Collector is positive and emitter is negative with respect to the base$ (3) $Collector is positive and emitter is at the same potential as the base$ (4) $Both collector and emitter are negative with respect to the base$ 341. $The combination of ‘NAND’ gates shown below are equivalent to [2016]$ (1) $an OR gate and an AND gate, respectively$ (2) $an AND gate and a NOT gate, respectively$ (3) $an AND gate and an OR gate, respectively$ (4) $an OR gate and a NOT gate, respectively.$ 342. $When p - n junction diode is reverse biased, then [2006]$ (1) $no current flows$ (2) $the depletion region is reduced$ (3) $the height of the potential barrier is reduced$ (4) $the depletion region is increased$ 343. $In the given circuit, the breakdown voltage of the Zener diode is 3.0 V . What is the value of I_{2} ?$ (1) $3.3 mA$ (2) $5.5 mA$ (3) $10 mA$ (4) $7 mA$ 344. $Refer to the circuit diagram given in the figure. which of the following observations are correct? A. Total resistance of circuit is 6Ω B . Current in Ammeter is 1 AC. Potential across AB is 4 Volts. D. Potential across CD is 4 Volts E. Total resistance of the circuit is 8Ω . Choose the correct answer from the options given below:$ (1) $A, B and D Only$ (2) $A, B and C Only$ (3) $A, C and D Only$ (4) $B, C and E Only$ 345. $The circuit diagram shown here corresponds to the logic gate, [NEET 2019]$ (1) $NOR$ (2) $AND$ (3) $OR$ (4) $NAND$ 346. $The voltage gain of the following amplifier is [2005]$ (1) $10$ (2) $9.9$ (3) $1000$ (4) $100$ 347. $The logic circuit below has the truth table, same as that of$ (1) $NOR gate$ (2) $NAND gate$ (3) $AND gate$ (4) $OR gate$ 348. $The logic gate equivalent to the given logic circuit is:$ (1) $NAND$ (2) $OR$ (3) $NOR$ (4) $AND$ 349. $When a zener diode is used as a regulator with zener voltage of 10 V, nearly five times the load current passes through the zener diode. What should be the series resistance for the zener diode. If load resistance is 2 kΩ and the unregulated voltage supplied is 16 V .$ (1) $500Ω$ (2) $100Ω$ (3) $200Ω$ (4) $800Ω$ 350. $If in a p - n junction diode, a square input signal of 10 V is applied as shown Then, the output signal across RL will be$ (1) (2) (3) (4) 351. $Find the correct combination of A, B, C and D inputs which can cause the LED to glow.$ (1) $1101$ (2) $0011$ (3) $1000$ (4) $0100$ 352. $The logic performed by the circuit shown in figure is equivalent to$ (1) $AND$ (2) $NOR$ (3) $OR$ (4) $NAND$ 353. $Which logic gate is represented by the following combination of logic gates? [2015]$ (1) $OR$ (2) $NAND$ (3) $AND$ (4) $NOR$ 354. $In the following common emitter configuration an n‐p‐n transistor with current gain β = 100 is used. The output voltage of the amplifier will be [2003]$ (1) $10 mV$ (2) $0.1 V$ (3) $10 V$ (4) $1.0 V$ 355. $A circuit is arranged as shown in figure. The output voltage V_{0} is equal to\dots..V$ 356. $If the potential barrier across a p-n junction is 0.6 V. Then the electric field intensity, in the depletion region having the width of 6 x 1 0^{- 6} m, will be _______ x 1 0^{5} N/C$ 357. $A potential divider circuit is connected with a de source of 20 V , a light emitting diode of glow in voltage 1.8 V and a zener diode of breakdown voltage of 3.2 V . The length (PR) of the resistive wire is 20 cm . The minimum length of PQ to just glow the LED is____ cm$ 358. $The value of power dissipated across the Zener diode (V_{z} = 15 V) connected in the circuit as shown in thefigure is x \times 10^{- 1} watt. The value of x, to the nearest integer, is____$ 359. $For the given circuit, the power across Zener diode is mW$ 360. $The circuit contains two diodes each with a forward resistance of 50Ω and with infinite reverse resistance. If the battery voltage is 6 V, thecurrent through the 120Ω resistance is mA$