Varactor Diode – Definition
Varactor consists of PN junction semiconductor diode works on the principle of variable diode. The internal capacitance of varactor diode varies with the variation of reverse voltages. The alternative names of varactor diode is varicap, volta cap, or epicap and tuning diode. It is a voltage-dependent device. It always works in reverse bias. The capacitance range of the varactor diode depends on the doping level. All the MCQs on Varactor Diode Multiple Choice Questions and Answers are published according to the new study syllabus for the academic year 2021-22.
Read More: MCQs on Semiconductor LASER Diode
The aim is to provide Varactor Diode MCQs objective questions and answers to understand the concepts of special diodes. If you are willing to learn the concepts of Basic Electronics MCQs multiple choice questions with answers then read all the questions and answers. You will be surely able to qualify for all kinds of Quiz/test/Interviews after understanding the varactor diode circuit. If you are a student, technician, or teacher then you can learn the basic concept of varactor diode advantages, disadvantages, application, principle, and function.
Varactor Diode MCQs (Multiple Choice Questions)
Q1. A Semiconductor PN Junction Diode works as a voltage-dependent capacitor on ________ bias is called Varactor Diode.
-
- Forward
- Reverse
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Answer: a
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Q2. A variable Capacitance Diode that operates on a reverse bias is called Varactor Diode. True / False
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Answer: True
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Q3. Varactor Diode is also called __________.
- Varicap
- Volta Cap or Epicap
- Tuning Diode
- All are correct
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Answer: d
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Q4. Varactor Diode is a Voltage Controlled Semiconductor Capacitor. True / False
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Answer: True
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Q5. The operation of Varactor Diode depends on the transition of __________.
- capacitance
- inductance
- resistance
- all are correct
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Answer: a
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Q6. Generally, the capacitance of the varactor diode is 6.8PF to 47PF. True / False
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Answer: True
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Read More: Photodiode MCQs Questions and Answers
Q7. Varactor diode can be used in ________.
- Television Receiver
- Automobile
- Radio
- All are correct
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Answer: d
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Q8. Now, varactor diodes are used as a replacement for the Mechanically tuned capacitor. True / False
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Answer: True
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Q9. The capacitance range of varactor diode depends on _________.
- Depletion Region
- Doping Level
- Dielectric
- All are correct
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Answer: b
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Q10. There are two types of varactor diode according to the doping profile. True / False
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Answer: True
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Q11. The doping level of the Abrupt Junction diode is _______.
- uniform
- different
- similar
- a & c are correct
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Answer: d
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Q12. Abrupt Junction and Hyperabrupt Junction diodes are the two types of Varactor diodes according to doping profile. True / False
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Answer: True
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Q13. The capacitance range or tuning ratio of abrupt junction diode is __________.
- 1:2 to 2:1
- 2:1 to 5:1
- 6:3 to 2:4
- 3:1 to 4:1
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Answer: d
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Read More: MCQs on History of Electronics Questions and Answers
Q14. Abrupt Junction and Hyperabrupt Junction diodes are the two main types of Varactor diodes according to the doping profile. True / False
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Answer: True
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Q15. The capacitance range or tuning ratio of abrupt junction diode is __________.
- 1:2 to 2:1
- 2:1 to 5:1
- 6:3 to 2:4
- 3:1 to 4:1
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Answer: d
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Q16. The tuning ratio of the Hyperabrupt Junction diode is about 10:1. True / False
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Answer: True
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Q17. When reverse bias applied to the Varactor Diode decreased then __________.
- thickness of depletion layer/dielectric decreased
- thickness of plates increased
- capacitance increased
- all are correct
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Answer: d
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Q18. The total capacitance can be changed when the varactor is used in parallel to fixed capacitor. True / False
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Answer: True
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Q19. The junction capacitance of varactor diode is in _______ farad.
- micro
- nano
- pico
- all are correct
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Answer: c
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Q20. Applications of Varactor diode is FM Modules, Adjustable Bandpass filter, Parametric amplifier and Automatic frequency control system. True / False
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Answer: True
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Read More: MCQs on History of Electricity
Q21. When reverse voltage of varactor diode are increased then capacitance will be_________.
- increased
- decreased
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Answer: b
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Q22. Most common use of varactor diode is Electronic Tuner. True / False
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Answer: True
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Q23. The formula of Resonant Frequency is Fr = 1 / 2π√(LC. True / False
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Answer: True
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