Electronic devices and circuits
Previous year question paper with solutions for Electronic devices and circuits
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- Discuss the behavior of p-n junction diode under forward and reverse biased conditions
- Draw circuit diagram for CC & CE configuration of transistor. Which is having higher gain and why?
- What is an oscillator? What are the essential components of feedback LC oscillator?
- State advantages of –ve feedback in amplifiers.
- Draw the block diagram of a multistage amplifier having n-stages. Write expression for its gain (A).
- What do you understand by “Early effect” in transistors?
- Give the principle of operation of phototransistor.
- What is operating point? Why is it necessary to stabilize operating point of a transistor amplifier?
- Define Peak Inverse voltage of a diode.
- Differentiate between avalanche and zener breakdown.
- Draw circuit diagram for CC & CE configuration of transistor. Which is having higher gain and why?
- When a perfect square pulse is applied to the transistor base, the transistor does not switch on immediately. Why?
- Justify the need of heat sinks in power amplifiers.
- Sketch small signal model of an FET at low frequencies.
- Can the channel of a JFET completely closes at the drain end? Explain the reason.
- Explain programmable UJT.
- What is Early effect? Explain how it affects the BJT characteristics in CB configuration
- Why is Schottky diode called hot carrier diode?
- What is the main difference between the characteristics of a simple switch and those of an ideal diode?
- Why the temperature coefficient of resistance of a semiconductor is negative?
- Distinguish between photodiode and phototransistor.
- Mention the significance of h-parameters.
- What is a Thermal Runaway process?
- What do you understand by operating point? What is its significance?
- What happens to the drain current of p-channel JFET when a positive voltage is applied on its gate?
- A JEFT has a pinch off voltage of –4 volts and the saturation current of 9 mA. Calculate the drain current if VGs = –2 Volts.
- What is the negative resistance region in UJT?
- Mention the significance of common emitter amplification factor βdc.
- Why the contact differences of potential exist in PN junction?
- Name different categories of liquid crystals based on the arrangement of molecules.