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Distinguish between a metal and an insulator on the basis of energy band diagrams ?
Concept: Energy Bands in Conductors, Semiconductors and Insulators
Why is zener diode fabricated by heavily doping both p- and n-sides of the junction?
Concept: Special Purpose P-n Junction Diodes
Draw the circuit diagram of zener diode as a voltage regulator and briefly explains its working ?
Concept: Zener Diode as a Voltage Regulator
How is a photodiode fabricated?
Concept: Special Purpose P-n Junction Diodes
Briefly explain its working. Draw its V - I characteristics for two different intensities of illumination ?
Concept: Special Purpose P-n Junction Diodes
In the circuit shown in the figure, identify the equivalent gate of the circuit and make its truth table.
Concept: Integrated Circuits
Describe briefly with the help of a circuit diagram, how the flow of current carriers in a p-n-p transistor is regulated with emitter-base junction forward biased and base-collector junction reverse biased.
Concept: Junction Transistor >> Feedback Amplifier and Transistor Oscillator
Name the device which is used as a voltage regulator. Draw the necessary circuit diagram and explain its working?
Concept: Zener Diode as a Voltage Regulator
Explain briefly the principle on which a transistor-amplifier works as an oscillator. Draw the necessary circuit diagram and explain its working ?
Concept: Junction Transistor >> Transistor as a Device
Identify the equivalent gate for the following circuit and write its truth table.
Concept: Integrated Circuits
Write two characteristic features to distinguish between n-type and p-type semiconductors ?
Concept: Energy Bands in Conductors, Semiconductors and Insulators
How does a light emitting diode (LED) work? Give two advantages of LED’s over the conventional incandescent lamps.
Concept: Special Purpose P-n Junction Diodes
Draw the circuit for studying the input and output characteristics of and transistor in CE configuration. Show, how, from the output characteristics, the information about the current amplification factor (βac) can obtained.
Concept: Transistor Action
Draw a plot of the transfer characteristics (V0 versus Vi) for a base-biased transistor in CE configuration. Show for which regions in the plot, the transistor can operate as a switch ?
Concept: Transistor Action
Why is a zener diode considered as a special purpose semiconductor diode?
Concept: Semiconductor Diode
Draw the I − V characteristics of zener diode and explain briefly how reverse current suddenly increase at the breakdown voltage.
Concept: Zener Diode as a Voltage Regulator
Describe briefly with the help of a circuit diagram how a zener diode works to obtain a constant dc voltage from the unregulated dc output of a rectifier ?
Concept: Zener Diode as a Voltage Regulator
The output of an OR gate is connected to both the inputs of a NAND gate Draw the logic circuit of this combinaion of getes and write its truth table.
Concept: Digital Electronics and Logic Gates
(i) Write the truth tables of the logic gates marked P and Q in the given circuit.
(ii) Write the truth table for the circuit.
Concept: Digital Electronics and Logic Gates
Why are NOR gates considered as universal gates?
Concept: Digital Electronics and Logic Gates
