Electronics QuizBy Sudha M / June 21, 2023 Welcome to Electronic Quiz 1. What is the effect of temperature on the recombination rate of electrons in electronic circuits? Recombination rate increases with increase in the temperature Recombination rate decreases with increase in the temperature Recombination rate is independent of temperature Recombination of electrons doesn’t occur in semiconductors 2. Which of the following is not correct about semiconductors in electronic devices? Electrons are present below Fermi level in a semiconductor Degenerated semiconductors behave like a conductor Fermi level is independent of temperature and doping Pentavalent atoms are used in an n-type extrinsic semiconductor 3. Which of the following is correct about photo diode electronic devices? P-N junction is connected in reverse bias. Electron-hole pairs are generated by impurity injection in depletion layer It is a photovoltaic cell No external voltage is applied 4. Which of the following is wrong about solar cell electronic devices? Solar cell responsivity is directly proportional to the wavelength of light It produces dark current It is a photovoltaic cell d) No external voltage is applied 5. Which of the following is wrong about threshold voltage (VT) in a MOSFET electronic circuit? If VTis less, channel form quickly for conductivity VTcan be reduced by reducing oxide layer thickness VT is independent of ion implementation VT can be reduced by reducing substrate doping 6. When an electronic circuit is in equilibrium then which of the following equation is valid? Jdrift + Jdiffusion = 1 Jdrift + Jdiffusion = 0 Jdrift + Jdiffusion = -1 Jdrift + Jdiffusion = 2 7. Which of the following diode is used in ultra-high speed switching electronic circuits? Zener diode Varactor diode Tunnel diode Schottky diode 8. Which of the following diode is used in adjustable band pass filter electronic circuits? Zener diode Varactor diode Tunnel diode Schottky diode 9. Which of the following is the correct order of turn-off times? MOSFET < BJT < IGBT < SCR MOSFET < IGBT < BJT < SCR SCR < BJT < IGBT < MOSFET BJT < MOSFET < IGBT < SCR 10.  Which of the following is correct relation for saturation region in a NMOS electronic circuit? VDS >= VG + VT VDS >= VG – VT VDS <= VG – VT VDS >= VG ± VT 11. Which of the following type of transistor is preferred in digital and analog electronic circuits? BJT JFET MOSFET FET 12. Which of the following technique can’t be used for generating electron-hole pairs in electronic devices? Thermal excitation Impact ionization Photo excitation Impurity injection 13. What is the conductivity of an extrinsic type semiconductor electronic device at 300K? Maximum Zero Can’t be determined Minimum 14. Which of the following circuits can be used as limiter or clamper or both? Only option a only option b & c All of the mentioned None 15. In a P-N junction the positive voltage at which the diode starts to conduct consequently is called. Cut off voltage Saturation voltage Knee voltage Breakdown voltage 16. The expression for the integration frequency is CR 1/CR R/C C/R 17. Consider a symmetrical square wave of 20-V peak-to-peak, 0 average, and 2-ms period applied to a Miller integrator. Find the value of the time constant CR such that the triangular waveform at the output has a 20-V peak-to-peak amplitude. 0.25ms 0.50ms 2.5ms 5.0ms 18. The diode in a half wave rectifier has a forward resistance RF. The voltage is Vmsinωt and the load resistance is RL. The DC current is given by _________ Vm/√2RL Vm/(RF+RL)π 2Vm/√π Vm/RL 19. How does a FET behave when the v-I characteristics are to the left of pinch off for an n channel FET? Voltage controlled resistor Amplifier Switch Diode 20. The correct relation between the transistor parameters α and ß are related by ß = 1 – α/α ß = 1 + α/α α = ß + 1/ß α = ß/ß + 1 21. For non linear operation, a transistor should be biased so that the Q-point is ________ near saturation near cut off where Ic is maximum halfway between cut off and saturation 22. Which is the main disadvantage of class B amplifiers? Expensive Less efficient More power dissipation More heat dissipation 23. What is the conduction angle for Class B push-pull amplifier? 0 90 180 270 24. For a phase-shift oscillator, the gain of the amplifier stage must be greater than ________ 19 30 29 1 Thank You Time's up
