The output transducer of the communication system converts the radio signal into ________.

Which of the following is not the advantage of PN junction diode over tube value?

In an N-P-N transistor circuit, the emitter, collector, and base current are respectively I_E, I_C, and l_B. The relation between them is _____________.

From the follwoing semi-conductor devices _________ operates in forward bias only.

To obtain a p-type germanium semiconductor, it must be doped with _____________.

The radiation of electrical energy is practicable only above _________

The energy band gap is maximum in ________________.

If the distance between the conduction band and valence band is leV, then this combination is _______________.

Resistance of a semiconductor is ______ to temperature change.

Pure semiconductors are called _________

Doped semiconductors are ____________

To remove d.c. voltage fluctuations we use _______

In PNP transistors, the direction of conventional current, when emitter-base junction is forward-biased is from __________

ln NPN transistors, when the emitter-base junction is forward-biased, the direction of conventional current is from _____________

Output characteristics of an NPN, transistor in CE mode is drawn between ___________

Define electron motion in a semiconductor.

Distinguish between intrinsic and extrinsic semiconductors.

Discuss the biasing polarities in an NPN and PNP transistors

What is the phase relationship between the AC input and output voltages in a common emitter amplifier? What is the reason for the phase reversal?

Give circuit symbol, logical operation, truth table, and Boolean expression of
i) AND gate
ii) OR gate
iii) NOT gate
iv) NAND gate
v) NOR gate and
vi) EX-OR gate.

Define energy band

Define Reverse bias.

Define Zener effect

Write the demerits of fiber optic communication?

What is mobile communication?

Elucidate the formation of a N -type and P-type semiconductors.

Explain the formation of depletion region and barrier potential in PN junction diode.

Write a note on photodiode.

State Boolean laws. Elucidate how they are used to simplify Boolean expressions with suitable example.

State and prove De Morgan’s first and second theorem.

Determine the wavelength of light emitted from LED which is made up of GaAsP semiconductor whose forbidden energy gap is 1.875 eV. Mention the colour of the light emitted (Take h = 6.6 x 10^-34 Js).

Give the Schematic representation of valence band, conduction band, and forbidden energy gap and draw energy band structure of
(a) Insulators
(b) Semiconductors
(c) Metals?

What are the advantages of FM

What are the application of satellite communication?

Why ground wave cannot be used for long distance communication using high frequency?

The given circuit has two ideal diodes connected as shown in figure below. Calculate the current flowing through the resistance R₁.

In the circuit shown in the figure, the input voltage V_i is 20 V, V_BE = 0 V, and V_CE = 0 V. What are the values of I_B, I_C, β?

Calculate the range of the variable capacitor that is to be used in a tuned-collector oscillator which has a fixed inductance of 150 μH. The frequency band is from 500 kHz to 1500 kHz.

What is the output Y in the following circuit, when all the three inputs A, B, and C are first 0 and then 1?

In the combination of the following gates, write the Boolean equation for output Y in terms of inputs A and B.

Explain and classify transistor as an oscillator.

Write any two distinguishing features between Insulators, Metals and semiconductors and insulators an the basis of energy band diagrams.

Write the applications of mobile communication.