Semiconductor Devices PYQs Set 9 (PDF)

Set 9 of 17 · Questions 241-270 of 501

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Mere Teacher · Previous Year Questions JEE Main Physics · Semiconductor Devices · Set 9 (Q241-270)
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241. $The correct Boolean operation represented by the circuit diagram drawn is:$ (1) $NOR$ (2) $AND$ (3) $OR$ (4) $NAND$ 242. $The I-V characteristics of a p-n junction diode in forward bias is shown in the figure. The ratio of dynamic resistance, corresponding to forward bias voltages of 2V and 4V respectively, is :$ (1) $1: 2$ (2) $5 : 1$ (3) $1 : 40$ (4) $20 : 1$ 243. $The value of net resistance of the network as shown in the given figure is :$ (1) $6Ω$ (2) $(5/2) Ω$ (3) $(15/4) Ω$ (4) $(30/11) Ω$ 244. $Choose the correct logic circuit for the given truth table having inputs A and B. Inputs Output A B Y 000010101111$ (1) (2) (3) (4) 245. $In a PN ‐junction diode not connected to any circuit [2015]$ (1) $the potential is the same everywhere$ (2) $the P ‐type is a higher potential than the N ‐type side$ (3) $there is an electric field at the junction directed from the N ‐type side to the P ‐type side$ (4) $there is an electric field at the junction directed from the P ‐type side to the N ‐type side$ 246. $In the logic circuit diagram, A, B and C are the inputs, Y is the output. The output Y is 'HIGH'$ (1) $for all the inputs 'LOW'.$ (2) $when A = 1, B = 0, C = 0$ (3) $when A = 1, B = 0, C = 1$ (4) $for all the inputs 'HIGH'.$ 247. $In the figure shown, if the diode forward voltage drop is 0.2 V. the voltage difference between A and B is$ (1) $1.3 V$ (2) $2.2 V$ (3) $0.5 V$ (4) $0$ 248. $To get output '1' at R, for the given logic gate circuit the input values must be:$ (1) $X = 1, Y = 1$ (2) $X = 0, Y = 0$ (3) $X = 0, Y = 1$ (4) $X = 1, Y = 0$ 249. $Figure shows a DC voltage regulator circuit, with a Zener diode of breakdown voltage = 6V. If the unregulated input voltage varies between 10 V to 16 V, then what is maximum Zener current?$ (1) $2.5 mA$ (2) $1.5 mA$ (3) $7.5 mA$ (4) $3.5 mA$ 250. $With increasing biasing voltage of a photodiode, the photocurrent magnitude$ (1) $Increases initially and after attaining certain value, it decreases$ (2) $Increases linearly$ (3) $Increases initially and saturates finally$ (4) $Remains constant$ 251. $An n.p.n transistor with current gain β = 100 in common emitter configuration is shown in figure. The output voltage of the amplifier will be$ (1) $0.1V$ (2) $1.0 V$ (3) $10 V$ (4) $100 V$ 252. $A 5.0 V stabilized power supply is required to be designed using a 12 VDC power supply as input source. The maximum power rating of zener diode is 2.0 W . The minimum value of resistance R_{s} (in Ω) connected in series with zener diode will be$ (1) $16.5$ (2) $17.5$ (3) $18.5$ (4) $15.5$ 253. $The logic operations performed by the given digital circuit is equivalent to:$ (1) $NOR$ (2) $AND$ (3) $OR$ (4) $NAND$ 254. $If each diode has a forward bias resistance of 25 Ω in the below circuit, Which of the following options is correct?$ (1) $\frac{I _{1}}{I _{2}} = 1$ (2) $\frac{I _{2}}{I _{1}} = 1$ (3) $\frac{I _{1}}{I _{2}} = 2$ (4) $\frac{I _{3}}{I _{4}} = 1$ 255. $The reverse breakdown voltage of a Zener diode is 5.6 V in the given circuit. The current I_{z} through the Zener is:$ (1) $10 mA$ (2) $17 mA$ (3) $15 mA$ (4) $7 mA$ 256. $The circuit has two oppositely connected ideal diodes in parallel. What is the current flowing in the circuit?$ (1) $2.0 A$ (2) $1.33 A$ (3) $1.71 A$ (4) $2.31 A$ 257. $The logic gate equivalent to the given circuit diagram is :$ (1) $OR$ (2) $NAND$ (3) $NOR$ (4) $AND$ 258. $For the transistor circuit shown below, if β = 100, voltage drop between emine r and base is 0.7 V then value of V_{Cl} will be [2017]$ (1) $10 V$ (2) $5 V$ (3) $13 V$ (4) $0 V$ 259. $The output of the given circuit diagram is$ (1) $A B Y 000100010111$ (2) $A B Y 000101011110$ (3) $A B Y 000100010110$ (4) $A B Y 000100011110$ 260. $To get output 1 for the following circuit, the correct choice for the input is [NEET 2016]$ (1) $A = 1, B = 0, C = 0$ (2) $A = 1, B = 1, C = 0$ (3) $A = 1, B = 0, C = 1$ (4) $A = 0, B = 1, C = 0$ 261. $Assuming in forward bias condition there is a voltage drop of 0.7 V across a silicon diode, the current through diode D_{1} in the circuit is____mA . (Assume all diodes in the given circuit are identical)$ (1) $17.6$ (2) $18.8$ (3) $11.7$ (4) $20.15$ 262. $In the following circuit, what are P and Q ?$ (1) $P = 0, Q = 1$ (2) $P = 0, Q = 0$ (3) $P = 1, Q = 1$ (4) $P = 1, Q = 0$ 263. $In the following common emitter configuration an npn transistor with current gain β = 100 is used. The output voltage of the amplifier will be$ (1) $10 mV$ (2) $0.1 V$ (3) $1.0 V$ (4) $10 V$ 264. $Two identical capacitors A and B, charged to the same potential 5V are connected in two different circuits as shown below at time t = 0. If the charge on capacitors A and B at time t = CR is Q_{A} and Q_{B} respectively, then (Here e is the base of natural logarithm)$ (1) $Q_{A} = VC, Q_{B} CV$ (2) $Q_{A} = VC, Q_{B} = VC/e$ (3) $Q_{A} = VC/e, Q_{B} = CV/2$ (4) $Q_{A} = CV/2, Q_{B} = VC/e$ 265. $What is output of the logic circuit shown below?$ (1) $Y = 0$ (2) $Y = 1$ (3) $Y=X$ (4) $Y=X'$ 266. $For a cubic crystal structure which one of the following relations indicating the cell characteristic is correct?[2007]$ (1) $a\neqb\neqc and α \neq = β and Y \neq = 9 0^{o}$ (2) $a\neqb\neqc and α = β = γ = 9 0^{o}$ (3) $a=b=c and α \neq = β \neq = γ = 9 0^{o}$ (4) $a=b=c and α = β = Y = 9 0^{o}$ 267. $A Zener diode of power rating 2W is to be used as a voltage regulator. If the Zener diode has a breakdown of 10V and it has to regulate voltage fluctuated between 6V and 14V, the value of R_{s} for safe operation should be Ω$ 268. $A Zener diode having Zener voltage 8V and power dissipation rating of 0.5W is connected across a potential divider arranged with maximum potential drop across Zener diode is as shown in the diagram. The value of protective resistance R_{p} is Ω .$ 269. $The circuit shown below is working as a 8 V dc regulated voltage source. When 12 V is used as input, the power dissipated (in mW) in each diode is ; (considering both zener diodes are identical).$ 270. $In connection with the circuit drawn below, the value of current flowing through 2 kΩ resistor is____\times 10^{- 4} A$