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When an intrinsic semiconductor such as $Si$ is doped with a small amount of a trivalent impurity like boron

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Important Questions on Semiconductor Electronics: Materials, Devices and Simple Circuits

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Physics>Modern Physics>Semiconductor Electronics: Materials, Devices and Simple Circuits>Extrinsic Semiconductor

Write the truth table of two inputs NAND gate.

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Physics>Modern Physics>Semiconductor Electronics: Materials, Devices and Simple Circuits>Extrinsic Semiconductor

Write two points of advantages of FM broadcasting over AM broadcasting.

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Physics>Modern Physics>Semiconductor Electronics: Materials, Devices and Simple Circuits>Extrinsic Semiconductor

In a transistor,

I_{C} = 0.98, I_{B} = 20 μA

. Find

(i)

α

and

(ii) β

Of the transistor.

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Physics>Modern Physics>Semiconductor Electronics: Materials, Devices and Simple Circuits>Extrinsic Semiconductor

For a pure Si crystal has

5 \times 10^{28}

atom $\mathrm{m}^{-3}$. It is doped by

1

PPM concentration of pentavalent As. Calculate the number of electron & holes.
(Given that

n_{i} = 1.5 \times 10^{16} m^{- 3}

)

EASY

Physics>Modern Physics>Semiconductor Electronics: Materials, Devices and Simple Circuits>Extrinsic Semiconductor

Write the truth table of AND gate.

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Physics>Modern Physics>Semiconductor Electronics: Materials, Devices and Simple Circuits>Extrinsic Semiconductor

Pure Silicon at

300 K

has equal number of electrons and holes concentration of

1.5 \times 10^{16} m^{- 3}

. Doping by indium increases the hole concentration

(n_{h})

4.5 \times 10^{22} m^{- 3}

. The number of electrons concentration

(n_{e})

in doped Silicon is

EASY

Physics>Modern Physics>Semiconductor Electronics: Materials, Devices and Simple Circuits>Extrinsic Semiconductor

Using block diagrams, name the segments of general communication system.

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Physics>Modern Physics>Semiconductor Electronics: Materials, Devices and Simple Circuits>Extrinsic Semiconductor

An intrinsic semiconductor is converted into

n

-type extrinsic semiconductor by doping it with:-

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Physics>Modern Physics>Semiconductor Electronics: Materials, Devices and Simple Circuits>Extrinsic Semiconductor

Explain with the help of a labelled circuit diagram, how an

n - p - n

transistor can be used as an amplifier in common emitter configuration. Also, explain how input and output voltages are out of phase by

180 °

for a common emitter transistor amplifier.

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Physics>Modern Physics>Semiconductor Electronics: Materials, Devices and Simple Circuits>Extrinsic Semiconductor

What is intrinsic semiconductor and extrinsic semiconductor? Write an example of each semiconductor.

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Physics>Modern Physics>Semiconductor Electronics: Materials, Devices and Simple Circuits>Extrinsic Semiconductor

In an unbiased p - n junction electrons diffuse from n-region to p-region because:

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Physics>Modern Physics>Semiconductor Electronics: Materials, Devices and Simple Circuits>Extrinsic Semiconductor

In a p-type semiconductor, the concentration of holes is

2 \times 10^{15} {cm}^{- 3} .

The intrinsic carrier concentration is

2 \times 10^{10} {cm}^{- 3} .

The concentration of electrons will be

EASY

Physics>Modern Physics>Semiconductor Electronics: Materials, Devices and Simple Circuits>Extrinsic Semiconductor

The barrier potential of a p-n junction depends on:

(a)

type of semi-conductor material

(b)

amount of doping

(c)

temperature
Which one of the following is correct?

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Physics>Modern Physics>Semiconductor Electronics: Materials, Devices and Simple Circuits>Extrinsic Semiconductor

Define small signal current gain of a transistor in common emitter configuration.

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Physics>Modern Physics>Semiconductor Electronics: Materials, Devices and Simple Circuits>Extrinsic Semiconductor

The contribution to the total current in a semiconductor, due to electrons and holes are

0.75

and

0.25

respectively. The drift velocity of electrons is

\frac{3}{2}

times that of holes at this temperature. Then the ratio between electron concentration and hole concentration is

EASY

Physics>Modern Physics>Semiconductor Electronics: Materials, Devices and Simple Circuits>Extrinsic Semiconductor

Silicon doped with gallium forms

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Physics>Modern Physics>Semiconductor Electronics: Materials, Devices and Simple Circuits>Extrinsic Semiconductor

In the following circuit diagram, the current through the battery is

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Physics>Modern Physics>Semiconductor Electronics: Materials, Devices and Simple Circuits>Extrinsic Semiconductor

What is sky wave propagation? Mention the frequency range used by this type of propagation.

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Physics>Modern Physics>Semiconductor Electronics: Materials, Devices and Simple Circuits>Extrinsic Semiconductor

With reference to semi-conductors answer the following $:$

$(iii)$ What is meant by doping?

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Physics>Modern Physics>Semiconductor Electronics: Materials, Devices and Simple Circuits>Extrinsic Semiconductor

Which of the following statement is false?

When an intrinsic semiconductor such as Si is doped with a small amount of a trivalent impurity like boron

Important Questions on Semiconductor Electronics: Materials, Devices and Simple Circuits

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When an intrinsic semiconductor such as $Si$ is doped with a small amount of a trivalent impurity like boron