In frequency modulated wave.

both frequency and amplitude vary with time

both frequency and amplitude are constant

Identify a false statement from the following

Diodes can be used for rectifying a DC voltage input to obtain AC voltage.

The number of electrons is equal to the number of holes in intrinsic semiconductors.

By changing the external applied voltage p - n junction barrier can be changed.

n - type semiconducting Si or Ge obtained by doping with pentavalent atoms.

Which of the following statement is false?

Majority carriers in a n - type semiconductor are holes.

Pure silicon doped with trivalent impurities gives a p - type semiconductor.

Minority carriers in a p -type semiconductor are electrons.

The Resistance of intrinsic semiconductor decreases with increases of temperature.

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TS EAMCET

IMPORTANT

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In the following figure, identify the diodes which are reverse biased

(A)

(B)

(C)

(D)

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Important Questions on Semiconductor Devices and Communication Systems

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IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 29 - Semiconductor Devices and Communication Systems>TS EAMCET - 10 August 2021 Shift 1>Q 7

The width of the depletion region in,

p - n

junction diode is

500 nm,

and an electric field of

6 \times 10^{5} V m^{- 1}

is also found to exist. The height of the potential barrier is

EASY

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IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 29 - Semiconductor Devices and Communication Systems>TS EAMCET Medical 2018 (02 May Shift-1)>Q 8

Two $p$ - $n$ photodiodes are fabricated from semiconductors with band gap of $2.8 eV$ and $2.6 eV,$ respectively.

Choose the correct statement from the following.

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 29 - Semiconductor Devices and Communication Systems>TS EAMCET 2020 (28-Sep Shift-1)>Q 9

The universal gates are

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 29 - Semiconductor Devices and Communication Systems>TS EAMCET 2020 (28-Sep Shift-1)>Q 10

What is the output of given logic circuit below if $A = 0, B = 1$ and $A = 1, B = 0$

Question Image

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 29 - Semiconductor Devices and Communication Systems>TS EAMCET Medical 2019 (8-May Shift-2)>Q 11

Identify the correct statement among the following.

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 29 - Semiconductor Devices and Communication Systems>TS EAMCET Medical 2021 (9-Aug Shift-1)>Q 12

In an amplitude modulation process, the modulation index is

μ .

The modulation index is changed to

μ_{1}

if the amplitude of modulation signal is increased by

1 % .

The modulation index is changed to

μ_{2}

if the amplitude of carrier signal is increased by

1 % .

Which of the following is true statement?

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 29 - Semiconductor Devices and Communication Systems>TS EAMCET 2020 (28-Sep Shift-1)>Q 13

A message signal

15 \sin (100 π t)

is used to modulate a carrier signal

45 \sin (3 \times 10^{6} π t) .

The modulation index is

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IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 29 - Semiconductor Devices and Communication Systems>TS EAMCET Medical 2018 (02 May Shift-1)>Q 14

If the maximum and minimum values of an amplitude modulated signals are respectively

5.9 V

and

1.2 V,

the modulation index of the signal is

In the following figure, identify the diodes which are reverse biased (A) (B) (C) (D)

Important Questions on Semiconductor Devices and Communication Systems

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In the following figure, identify the diodes which are reverse biased

(A)

(B)

(C)

(D)