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					Subject-EDC                                               Semester-3rd


Q1.   Draw the characterstics of a P-N junction diode with proper voltage
      and current labels and regions of forward and reverse bias.Write the
      relation between forward current and forward voltage.

Q2.   What is 'barrier potential' in a P-N junction? What happen when the
      N-type material is made more postive than the P-type material by an
      external voltage source?What ultimately happens if the applied
      voltage is gradually increased?

Q3.   What is the static resistance of a diode? How will you find the
      dynamic resistance of a diode?

Q4.   Write short note on "Filter circuits used in power supply".

Q5.   What is LED? Give its principle of working, construction, circuit
      symbol, merits, demerits and applications.

Q6.   What are LCDs? In what respects they are advantageous over LEDs?
      Give their drawbacks in comparison to LEDs and applications.

Q7.   Explain the working of a full-wave bridge rectifier. Find the values of
      PIV for each diode.

Q8.   Discuss "junction diode switching time" to justify diode reverse
      recovery time, storage time and transition time in brief.Elaborate these
      definitions by labelling an appropriate waveform for diode.

                                                               Er.Raju Sharma
Subject-EDC                                               Semester-3rd


Q1.   Sketch the family of CB output characteristics for a transistor.
      Indicate the active, cut-off and saturation regions. Explain the shapes
      of the curves qualitatively.
Q2.   Compare the CB,CE,and CC configurations of a transistor. For CE
      configuration, Prove that Ic=βIb=(β+1)Ico
Q3.   How transistor amplifies the input signal? Explain.
Q4.   What is Early Effect? Explain how it affects the BJT characteristics in
      CB configuration.
Q5.   Describe the construction details of UJT. Sketch its V-I characteristics
      and explain its operation.

                                                                Er.Raju Sharma
Subject-EDC                                                Semester-3rd


Q1.   Explain the term “biasing”
Q2.   Explain why a transistor should be biased.
Q3.   Explain how stabilization of operating point is achieved when one end
      of the base resistor Re is connected to the collector terminal instead of
      the dc supply.
Q4.   Explain the function of the emitter resistor Re in the potential-divider
      biasing circuit.
Q5.   Explain why the fixed-bias circuit, in spite of its simplicity, is not
      much used in amplifiers.

                                                                Er.Raju Sharma
Subject-EDC                                                            Semester-3rd


Q1.   Sketch the basic structure of N-channel JFET.
Q2.   Draw the circuit symbols of
      (a) an N-channel JFET
      (b) a P-channel JFET
Q3.    Show the biasing arrangement of an N-channel JFET.
Q4.   What do you understand by the term „channel‟ in a JFET?
Q5.   Write a short note on Biasing of FETs.
Q6.   Explain the working of FET as an amplifier in CS configuration

                                                                           Er.Raju Sharma
Subject-EDC                                                     Semester-3rd


Q1.   Why do you need more than one stage of amplifiers in practical circuits?
Q2.   It is known that a high value of gain can be obtained from a single stage of
      amplifier, if we use positive or regenerative feedback. Then, why can‟t we use
      this technique of obtaining high gain rather than using a multi-stage amplifier?
Q3.   State the reasons why we prefer expressing the gain of an amplifier on a
      logarithmic scale rather than on a linear scale.
Q4.   Define the unit decibel for expressing
      (a) Voltage
      (b) Current
      (c) Power.

Q5.   Why does the gain of an RC-coupled amplifier fall in
      (a) low-frequency range
      (b) high-frequency

                                                                      Er.Raju Sharma

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