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Semiconductors

The document contains a series of questions related to semiconductor electronics, covering topics such as p-n junction diodes, biasing, impurity effects, and characteristics of n-type and p-type semiconductors. It includes questions of varying difficulty, from basic definitions to more complex explanations involving diagrams and circuit designs. The content is structured into sections based on the marks assigned to each question, indicating the depth of knowledge required.

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Lokesh
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49 views1 page

Semiconductors

The document contains a series of questions related to semiconductor electronics, covering topics such as p-n junction diodes, biasing, impurity effects, and characteristics of n-type and p-type semiconductors. It includes questions of varying difficulty, from basic definitions to more complex explanations involving diagrams and circuit designs. The content is structured into sections based on the marks assigned to each question, indicating the depth of knowledge required.

Uploaded by

Lokesh
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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SEMICONDUCTOR

ELECTRONICS, MATERIALS, DEVICES AND SIMPLE CIRCUITS.


1M QUESTIONS
1. Name the type of biasing of a p-n junction diode so that the junction offers very high resistance.
2. Name one impurity each, which when added to pure Si, produces (i) n-type, and (ii)p-type semiconductor.
3. Draw energy band diagram of a p-type semiconductor and n-type semiconductor.
4. Name two factors on which electrical conductivity of a pure semiconductor at a given temperature depends.
5. Draw the voltage- current characteristic of a Zener diode.
6. Draw the voltage – current characteristic of a p-n junction diode in forward bias and reverse bias
7. Give the ratio of the number of holes and number of conduction electrons in an intrinsic semiconductor.
8. How does the energy gap of an intrinsic semiconductor vary, when doped with pentavalent and trivalent impurities?
9. How does the thickness of the depletion layer in a p-n junction vary with increase in reverse bias?
10. What is a hole in a semiconductor? And what is it’s charge?
11. What is depletion region in a p-n junction?
2/3M QUESTIONS
1. Explain how the width of depletion layer in a p-n junction diode changes when the junction is forward and reverse biased.
2. The output of an unregulated d.c. power supply is to be regulated. Name the device that can be used for this purpose and
draw the relevant circuit diagram.
3. Show the biasing of a photodiode with the help of a circuit diagram. Draw graphs to show variations in reverse bias currents
for different illumination intensities.
4. With the help of a diagram, show the biasing of a LED. Give its two advantages.
5. Write a short note on Zener diode.
6. Explain Photo voltaic cell action.
7. Distinguish between n-type and p-type semiconductor.
8. Distinguish between intrinsic and extrinsic semiconductor.
3M QUESTIONS
1. What is an intrinsic semiconductor? How can this material be converted into (i) p-type (ii) n-type extrinsic semiconductor?
Explain with the help of energy band diagrams.
2. Explain (i) forward biasing, (ii) reverse biasing of a p-n junction diode.
3. With the help of a circuit diagram, explain the use of p-n junction diode as a full wave rectifier.
4. The ratio of the number density, of free electrons to holes, for three different materials A, B and C are equal to one, less than
one and more than one respectively. Name the type of semiconductor to which A, B and C belong. Draw labelled energy band
diagrams for three materials.
5. On the basis of the energy band diagrams distinguish between metals, insulators and semiconductors.
6. What is a rectifier? With the help of a labelled circuit diagram, explain the working of a half wave rectifier. Draw input and
output wave forms.
7. Explain with the help of a diagram how depletion layer, and potential barrier is formed in a p-n junction diode.

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