Analog devices and circuits
Previous year question paper with solutions for Analog devices and circuits
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- Why is hybrid model of a transistor preferred over other methods?
- State the necessary conditions for oscillations in feedback amplifier.
- Explain why power amplifiers is always preceded by voltage amplifier.
- A BJT has base current 10 micro amperes, beta as 99, and leakage collector current of 1 micro ampere. Find the collector current
- With the help of labeled energy band diagrams give the formation of open circuit PN junction.
- Compare Zener breakdown and Avalanche break down.
- Enlist various advantages and disadvantages of Wein Bridge oscillator.
- Explain with the help of circuit diagram the purpose of providing negative feedback.
- Draw the hybrid model of CE, CB and CC BJT's.
- A transformer coupled Class A large signal amplifier has maximum and minimum values of collector emitter voltage of 25 V and 2.5 V. Determine its collector efficiency.
- How is LED different from an ordinary PN junction diode?
- How does conductivity of a semiconductor change with rise in its temperature?
- Can two diodes connected back to back behave as a transistor? Give brief justification.
- Why power amplifiers are called large signal amplifier?
- Open loop gain of amplifier is 60000 and closed loop gain with negative feedback is 300. If open loop upper cut-off frequency is 15kHz, what is the closed loop frequency?
- State the Barkhausen criteria for oscillator.
- Why tunnel diode is called as negative resistance diode?
- Define the threshold voltage of MOSFET.
- Why it is required to have a stable Q-point of an amplifier?
- What is the effect of high frequencies on RC coupled amplifier gain characteristics?
- What is the difference between current and voltage feedback in amplifiers?
- Which is the initial condition for oscillation to start?
- What is the value of Ripple factor for half wave and full wave rectifier?
- Draw the VI characteristics of following diode : (i) Zener diode (ii) Tunnel diode
- Why does MOSFET need careful handling?
- What is quiescent point?
- Comment on the maximum efficiency of class-B amplifier.
- What is stability factor?
- Define unijunction transistor.
- Define thermal runway of the BJT?