If a small amount of antimony (Sb) is added to germanium crystal,______.

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

The forbidden energy band gap in semi conductor, conductor and insulator are E₁, E₂ and E₃ respectively. The relation among them is _______________.

The radiation of electrical energy is practicable only above _________

Microphone converts __________ energy into ________ energy.

In an insulator the energy gap between the conduction band and valence band is of the order of _____________.

Vacant energy levels are called _________

The speaker converts ________ energy into ______ energy.

Resistance of any photosensitive material is ______ to the intensity of light exposed

Zener breakdown is mainly due to ________

When the output is an complement of the input it is ____________

_________ is the most often used wire material.

________ wire is used between telephones and the central office

The distance of a geostationary satellite's orbit from the Earth is about _______

The maximum carrier swing allowed in frequency modulation is ________________.

Distinguish between wireline and wireless communication? Specify the range of electromagnetic waves in which it is used.

What does RADAR stand for?

Distinguish between intrinsic and extrinsic semiconductors.

What do you mean by doping?

Distinguish between avalanche breakdown and Zener breakdown.

Explain the current flow in a NPN transistor.

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.

Mention any three application Zener diode.

Explain the basic elements of communication system with the necessary block diagram.

What do you know about GPS? Write a few applications of GPS.

Fiber optic communication is gaining popularity among the various transmission media -justify.

Draw the circuit diagram of a half-wave rectifier and explain its working.

Write a note on photodiode.

Transistor functions as a switch. Explain.

A silicon diode is connected with 1kΩ resistor as shown. Find the value of current flowing through AB is

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).

The output characteristics of a transistor connected in common emitter mode is shown in the figure. Determine the value of IC when V_CE = 15 V. Also determine the value of I_C when V_CE is changed to 10 V

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?

A transistor having α = 0.99 and V_BE = 0.7V, is connected in the common-cmiitter configuration as shown in figure. If the transister is in saturation region, find the value of the collector current.

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.

How does the change in temperature and application of electric field affect the behavior of materials and write the range of resistivity for each materials.

Explain current transfer characteristics.

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

For a BJT, the common - base current gain α = 0.98 and the collector base junction reverse bias saturation I_CU = 0.6μA. This BJT is connected in the common emitter mode and operated in the active region with a base drive current I_D= 20 μA. The collector current I_C for this mode of operating is

What is RADAR? Explain its function. State its applications