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 and classify transistor as an oscillator.

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

For a BJT circuit shown, assume that the 'β' of the transistor is very large and V_BE= 0.7 V. The mode of operation.

What is RADAR? Explain its function. State its applications

Write the applications of mobile communication.

What is meant by satellite communication? Give its applications.

Draw the block diagram of transistor oscillators and explain it. (or) Explain the working of the transistor as on oscillator.

Calculate the voltage of resistors R_B in the circuit shown to put V_CE at 3.0 V.

What is a solar cell? Draw the cross-sectional view of a solar cell and explain its consumption and working. Write a note on solar arrays.

In the following diagrams, indicate which of the diodes are forward biased and which reverse biased?