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Physics · Textbook solutions

Semiconductor Devices

Every solved example, exercise, and miscellaneous question, in the order the textbook teaches them. Plus every board question asked from this chapter. · 30 questions

16. Semiconductor Devices — worked examples

2 q

Solved Examples

Worked · 2
  1. Solved Ex.16.1
    If the frequency of the input voltage50 Hz is applied to a (a) half wave rectifier and (b) full wave rectifier, what is the output frequency in both cases?
  2. Solved Ex.16.2
    A 5.0V stabilized power supply is required to be desinged using a 12V DC power supply as input source. The maximum power rating PZP_{Z} of the Zener diode is 2.0 W. Using the Zener regulator circuit described in Fig. 16.8, calculate, a) The maximum current flowing through the Zener diode. b) The minimum value of the series resistor, RSR_{S}. c) The load current ILI_{L} if a load resistor of 1kΩ\Omega is connected across the Zener diode. d) The Zener current IZI_{Z} at full load.

Exercises

28 q

Choose the correct option

Practice · 5
  1. Choose the correct option.
    Ex Q.1 (i)
    In a BJT, largest current flow occurs

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  2. Ex Q.1 (ii)
    A series resistance is connected in the Zener diode circuit to

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  3. Ex Q.1 (iii)
    A LED emits visible light when its

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  4. Ex Q.1 (v)
    Solar cell operates on the principle of:

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  5. Ex Q.1 (iv)
    A logic gate is an electronic circuit which:

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Answer in brief

Practice · 5
  1. Answer in brief.
    Ex Q.2 (i)
    Why is the base of a transistor made thin and is lightly doped?
  2. Ex Q.2 (ii)
    How is a Zener diode different than an ordinary diode?
  3. Ex Q.2 (iii)
    On which factors does the wavelength of light emitted by a LED depend?
  4. Ex Q.2 (iv)
    Why should a photodiode be operated in reverse biased mode?
  5. Ex Q.2 (v)
    State the principle and uses of a solar Cell.

Solve the following

Practice · 18
  1. Ex Q.3
    Draw the circuit diagram of a half wave rectifier. Explain its working. What is the frequency of ripple in its output?
  2. Ex Q.4
    Why do we need filters in a power supply?
  3. Ex Q.5
    Draw a neat diagram of a full wave rectifier and explain it's working.
  4. Ex Q.6
    Explain how a Zener diode maintains constant voltage across a load.
  5. Ex Q.7
    Explain the forward and the reverse characteristic of a Zener diode.
  6. Ex Q.8
    Explain the working of a LED.
  7. Ex Q.9
    Explain the construction and working of solar cell.
  8. Ex Q.10
    Explain the principle of operation of a photodiode.
  9. Ex Q.11
    What do you mean by a logic gate, a truth table and a Boolean expression?
  10. Ex Q.12
    What is logic gate? Write down the truth table and Boolean expression for 'AND' gate.
  11. Ex Q.13
    What are the uses of logic gates? Why is a NOT gate known as an inverter?
  12. Ex Q.14
    Write the Boolean expression for (i) OR gate, (ii) AND gate, and (iii) NAND Gate.
  13. Ex Q.15
    Why is the emitter, the base and the collector of a BJT doped differently?
  14. Ex Q.16
    Which method of biasing is used for operating transistor as an amplifier?
  15. Ex Q.17
    Define α\alpha and β\beta. Derive the relation between then.
  16. Ex Q.18
    The common-base DC current gain of a transistor is 0.967. If the emitter current is 10mA. What is the value of base current?
  17. Ex Q.19
    In a comman-base connection, a certain transistor has an emitter current of 10mA and collector current of 9.8 mA. Calculate the value of the base current.
  18. Ex Q.20
    In a common-base connection, the emitter current is 6.28mA and collector current is 6.20 mA. Determine the common base DC current gain.