All STD 12 - Semicondutor electronics questions
Newest firstShowing 151–181 of 181 questions
- 151. The figure represents a voltage regulator circuit using a Zener diode. The breakdown voltage of the Zener diode is \(6\,V\) and the load resistance is \(R_L= 4\,k\Omega .\) The series resistance of the circuit is \(R_i = 1\,k\Omega .\) If the battery voltage \(V_B\) varies from \(8\,V\) to \(16\,V,\) what are the minimum and maximum values of the current through Zener diode?
2019 Hard - 152. The logic gate equivalent to the given logic circuit is
2019 Medium - 153. The output of the given logic circuit is
2019 Hard - 154. The reverse breakdown voltage of a Zener diode is \(5.6\, V\) in the given circuit. The current \(I_z\) through the Zener is......\(mA\)
2019 Hard - 155. The transfer characteristic curve of a transistor, having input and output resistance \(100\,\Omega \) and \(100\,k\Omega \) respectively, is shown in the figure. The Voltage and Power gain, are respectively
2019 Hard - 156. The truth table for the circuit given in the fig is
2019 Medium - 157. To get output ‘\(1\)’ at \(R\), for the given logic gate circuit the input values must be
2019 Hard - 158. In a common emitter configuration with suitable bias, it is given than \(R_L\) is the load resistance and \(R_{BE}\) is small signal dynamic resistance (input side). Then, voltage gain, current gain and power gain are given, respectively, by: [ \(\beta \) is current gain, \(I_B\) , \(I_C\) , \(I_E\) are respectively base, collector and emitter currents] 2018 Hard
- 159. In the given circuit, the current through zener diode is......\(mA\)
2018 Hard - 160. The reading of the ammeter for a silicon diode in the given circuit is.......\(mA\)
2018 Medium - 161. Truth table for the given circuit will be
2018 Hard - 162. In a common emitter amplifier circuit using an \(n-p-n\) transistor, the phase difference between the input and the output voltages will be.....\(^o\) 2017 Easy
- 163. The current gain of a common emitter amplifier is \(69\). If the emitter current is \(7.0\,mA\), collector current is.....\(mA\) 2017 Medium
- 164. The \(V-I\) characteristic of a diode is shown in the figure. The ratio of forward to reverse bias resistance is
2017 Hard - 165. What is the conductivity of a semiconductor sample having electron concentration of \(5 \times 10^{18}\, m^{-3}\), hole concentration of \(5 \times 10^{19}\, m^{-3}\), electron mobility of \(2 .0\, m^2\, v^{-1}\, s^{-1}\) and hole mobility of \(0.01\, m^2\, v^{ -1}\, s^{-1}\) ?........\({\left( {\Omega - m} \right)^{ - 1}}\) (Take charge of electron as \(1.6 \times 10^{-19}\, C\)) 2017 Medium
- 166. An experiment is performed to determine the \(I-V\) characteristics of a Zener diode, which has a protective resistance of \(R = 100 \,\Omega ,\) and a maximum power of dissipation rating of \(1\,W\) .The minimum voltage range of the \(DC\) source in the circuit is 2016 Medium
- 167. An unknown transistor needs to be identified as a \(npn\) or \(pnp\) type. A multimeter, with \(+ve\) and \(-ve\) terminals, is used to measure resistance between different terminals of transistor. If terminal \(2\) is the base of the transistor then which of the following is correct for a \(pnp\) transistor? 2016 Medium
- 168. Identify the semiconductor devices whose characteristics are given below, in the order \((a),(b),(c),(d) \)
2016 Medium - 169. If \(a,\, b,\,c,\,d\) are inputs to a gate and \(x\) is its output, then, as per the following time graph, the gate is
2016 Medium - 170. The ratio \((R)\) of output resistance \(r_0\), and the input resistance \(r_i\) in measurements of input and output characteristics of a transistor is typically in the range 2016 Medium
- 171. The temperature dependence of resistances of \(Cu\) and undoped \(Si\) in the temperature range \(300-400\;K\), is best described by 2016 Easy
- 172. A \(2\,V\) battery is connected across \(AB\) as shown in the figure. The value of the current supplied by the battery when in one case battery's positive terminal is connected to \(A\) and in other case when positive terminal of battery is connected to \(B\) will respectively be
2015 Medium - 173. In an unbiased \(n-p\) junction electrons diffuse from \(n-\) region to \(p-\) region because 2015 Easy
- 174. The value of the resistor, \(R_S\), needed in the \(dc\) voltage regulator circuit shown here, equals
2015 Medium - 175. A Zener diode is connected to a battery and a load as show below: The currents, \(I, I_Z\) and \(I_L\) are respectively .
2014 Hard - 176. An \(n-p-n\) transistor has three leads \(A,B\) and \(C\) . Connecting \(B\) and \(C\) by moist fingers, \(A\) to the positive lead of an ammeter, and \(C\) to the negative lead of the ammeter, one finds large deflection. Then, \(A, B\) and \(C\) refer respectivily to 2014 Medium
- 177. Given \(A\) and \(B\) are input terminals. Logic \(1\, = \,> 5\, V\) Logic \(0\, =\, < 1\, V\) Which logic gate operation, the above circuit does?
2014 Hard - 178. Identify the gate and match \(A, B, Y\) in bracket to check
2014 Hard - 179. The current voltage relation of a diode is given by \(I=(e^{1000V/T} -1)mA\) where the applied voltage \(V\) is in volts and the temperature \(T\) is in degree kelvin. If a student makes an error measuring \(±0.01\ V\) while measuring the current of \(5\ mA\) at \(300\ K\), what will be the error in the value of current in \(mA?\) 2014 Medium
- 180. Consider two \(npn\) transistors as shown in figure. If \(0\,Volts\) corresponds to false and \(5\, Volts\) correspond to true then the output at \(C\) corresponds to
2013 Hard - 181. Figure shows a circuit in which three identical diodes are used . Each diode has forward resistance of \(20\,\Omega \) and infinite backward resistance. Resistors \(R_1 = R_2 = R_3 = 50\,\Omega.\) Battery voltage is \(6\,V.\) The current through \(R_3\) is.....\(mA\)
2013 Medium
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