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Explain how a potential barrier is developed in a p-n junction diode.
Concept: Special Purpose P-n Junction Diodes
Draw the circuit arrangement for studying the V-I characteristics of a p-n junction diode in reverse bias. Plot the V-I characteristics in this case.
Concept: Special Purpose P-n Junction Diodes
Draw the V-I characteristics of an LED. State two advantages of LED lamps over convertional incandescent lamps.
Concept: Special Purpose P-n Junction Diodes
Answer the following question.
Three photodiodes D1, D2, and D3 are made of semiconductors having band gaps of 2.5 eV, 2 eV, and 3 eV respectively. Which of them will not be able to detect light of wavelength 600 nm?
Concept: Classification of Metals, Conductors and Semiconductors
Answer the following question.
Why photodiodes are required to operate in reverse bias? Explain.
Concept: Semiconductor Diode
Answer the following question.
Describe briefly the functions of the three segments of the n-p-n transistor.
Concept: Junction Transistor >> Transistor: Structure and Action
The wavelength and intensity of light emitted by a LED depend upon ______.
Concept: Special Purpose P-n Junction Diodes
The ability of a junction diode to ______ an alternating voltage is based on the fact that it allows current to pass only when it is forward biased.
Concept: Application of Junction Diode as a Rectifier
Explain the three processes involved in the working of a solar cell.
Concept: Special Purpose P-n Junction Diodes
Explain the formation of the barrier potential in a p-n junction.
Concept: Semiconductor Diode
Pieces of copper and of silicon are initially at room temperature. Both are heated to temperature T. The conductivity of ______.
Concept: Extrinsic Semiconductor
Answer the following giving reasons:
A p-n junction diode is damaged by a strong current.
Concept: Semiconductor Diode
Answer the following giving reasons:
Impurities are added to intrinsic semiconductors.
Concept: Intrinsic Semiconductor
During the formation of a p-n junction ______.
Concept: p-n Junction
Explain the terms Attenuation used in Communication System.
Concept: Basic Terminology Used in Electronic Communication Systems
Explain any two factors that justify the need of modulating a low-frequency signal.
Concept: Amplitude Modulation (AM)
How is amplitude modulation achieved?
Concept: Amplitude Modulation (AM)
The frequencies of two side bands in an AM wave are 640 kHz and 660 kHz respectively. Find the frequencies of carrier and modulating signal. What is the bandwidth required for amplitude modulation?
Concept: Amplitude Modulation (AM)
Write two advantages of frequency modulation over amplitude modulation.
Concept: Amplitude Modulation (AM)
Define the term modulation. Draw a block diagram of a simple modulator for obtaining AM signal ?
Concept: Modulation and Its Necessity
