Electronic Devices and Circuits MCQ

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Basic electronics

Electronic Devices and Circuits MCQ

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With a very high amount of doping in degenerative type semiconductors, atoms come closer. For this reason, the interatomic interaction cannot be neglected. So, the effective band gap becomes narrow.

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Category: Electronics basics

1. Which of the following effects is responsible for violating the mass action law in degenerative type semiconductor electronic devices?

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Category: Electronics basics

2. Which of the following is false about Fermi-Dirac distribution function f(E) used to understand semiconductors in electronic circuits?

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3. In which of the following region does BJT act as the amplifier electronic device?

 Electron-hole pairs can be generated by increasing temperature or ionization or photo excitation. Impurity injection is done for doping of semiconductors. This process doesn’t generate electron-hole pairs.

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Category: Electronics basics

4. Which of the following technique can’t be used for generating electron-hole pairs in electronic devices?

Electronic devices like MOSFET have the lowest turn-off times (nanoseconds). BJT has turn-off times in between nanoseconds to microseconds. IGBT and SCR have turn-off times of about 1 and 5 microseconds respectively.

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5. Which of the following is the correct order of turn-off times?

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Category: Electronics basics

6. Which of the following is wrong about P-N junction diodes used in electronic devices?

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Category: Electronics basics

7. Which of the following is not correct about a step-graded junction in electronic devices?

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Category: Electronics basics

8. What is the conductivity of an extrinsic type semiconductor electronic device at 300K?

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Category: Electronics basics

9. Which of the following is wrong about threshold voltage (VT) in a MOSFET electronic circuit?

LEDs need compound type semiconductors because they have direct band gap. In direct band gap, photons are easily generated when electrons release energy during recombination.

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Category: Electronics basics

10.  What type of semiconductor is used in LED electronic circuits?

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Category: Electronics basics

11. Which of the following is correct about Hall Effect in electronic circuits?

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Category: Electronics basics

12. Forbidden Energy gap (EG) of a semiconductor in electronic devices depends on which of the following factors?

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Category: Electronics basics

13.  Which of the following is not an electronic device?

Recombination rate decreases when temperature increases because the electrons that are going to combine with holes in the valence bond are re-excited.

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Category: Electronics basics

14. What is the effect of temperature on the recombination rate of electrons in electronic circuits?

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Category: Electronics basics

15.  Which of the following is not a physical component of an electronic circuit?

In the saturation region, the emitter-base junction is forward biased, the collector-base junction is also forward biased. This is the operating mode when no current flows through BJT.

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Category: Electronics basics

16. In which region does BJT act as the OFF switch in electronic circuits?

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Category: Electronics basics

17. Which of the following is correct about NMOS electronic circuits?

When the depletion layer starts moving into the channel, due to the reverse bias of drain and substrate voltage, the inverted charge in the channel decreases from source to drain.

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Category: Electronics basics

18. Which of the following is true about the depletion layer channel in an NMOS electronic circuit?

Mass action law is related to the concentration of electrons and holes in a semiconductor. Degenerative type semiconductors show similar behavior to metal. So, Mass action law is not valid for them.

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Category: Electronics basics

19. Mass action law is not valid for which type of semiconductors in electronic devices?

At T = 0K, conductivity will be zero because donar level ionization is zero, so no free electron is there in the conduction band. Conductivity is measured when free electrons are present in the conduction band for conduction

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Category: Electronics basics

20.  What is the conductivity of an extrinsic type semiconductor electronic device at 0K?

Zener diode is a heavily doped diode. It is used in reverse bias. It has Zener breakdown. It is used in voltage regulators because it passes an excess amount of current in breakdown mode by maintaining constant voltage across the load.

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Category: Electronics basics

21. Which of the following is true about Zener diode?

MOSFET is preferred in digital and analog electronic circuits because it is faster than all other transistors. Also, it has a very high input impedance.

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22. Which of the following type of transistor is preferred in digital and analog electronic circuits?

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23. Which of the following is correct about photo diode electronic devices?

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24.  Which of the following is correct about semiconductors in electronic devices?

 Degenerative N-type and degenerative p-type semiconductors are used in tunnel diodes. Tunnel diodes are used in microwave electronic devices and circuits.

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Category: Electronics basics

25. Which type of semiconductor is used in Tunnel Diode?

Silicon is mostly used to construct electronic circuits because silicon has a much higher PIV (Peak Inverse Voltage) than the other semiconductors. It is also very cheap.

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Category: Electronics basics

26. Which of the following semiconductor is mostly used to construct electronic circuits?

Due to tunneling, a large number of electrons penetrate through the junction, so a large amount of current is produced. And as we are considering a special diode, we can control its I-V characteristics to improve the switching speed.

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Category: Electronics basics

27. Which of the following diode is used in ultra-high speed switching electronic circuits?

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Category: Electronics basics

28. Which of the following is not correct about semiconductors in electronic devices?

Band pass filter depends upon the value of the resistance and capacitance. In varactor diode, we can obtain capacitance by varying the input voltage. As capacitance becomes adjustable, it can be considered as an adjustable band pass filter.

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Category: Electronics basics

29. Which of the following diode is used in adjustable band pass filter electronic circuits?

Solar cell is a photovoltaic cell. No external voltage is applied and solar cell responsivity is directly proportional to the wavelength of the incident light. It doesn’t produce dark current.

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Category: Electronics basics

30. Which of the following is wrong about solar cell electronic devices?

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Category: Electronics basics

31. Which of the following is not a property of semiconductors used in electronic devices?

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