Electronics and Communication Engineering
GATE ECE year:2023 PYQs
Build your understanding with focused practice from past exam papers.
Questions 61–65 of 65. Imported answers require independent review unless marked reviewed.
Question 61
Open questionECNAT2 marksNeeds review
In a semiconductor device, the Fermi-energy level is 0.35 eV above the valence band energy. The effective density of states in the valence band at T = 300 K is
. The thermal equilibrium hole concentration in silicon at 400 K is _________
(rounded off to two decimal places).Given kT at 300 K is 0.026 eV.
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A sample and hold circuit is implemented using a resistive switch and a capacitor with a time constant of 1
s. The time for the sampling switch to stay closed to charge a capacitor adequately to a full scale voltage of 1 V with 12-bit accuracy is ______
s (rounded off to two decimal places).Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 63
Open questionECNAT2 marksNeeds review
In a given sequential circuit, initial states are
and
. For a clock frequency of 1 MHz, the frequency of signal
in kHz, is _________ (rounded off to the nearest integer).
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In the circuit below, the voltage
is __________ V (rounded off to two decimal places).
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Open questionECNAT2 marksNeeds review
The frequency of occurence of 8 symbols (a-h) is shown in the table below. A symbol is chosen and it is determined by asking a series of “yes/no” questions which are assumed to be truthfully answered. The average number of questions when asked in the most efficient sequence, to determine the chosen symbol, is ______ (rounded off to two decimal places).
Symbols | a | b | c | d | e | f | g | h |
|---|---|---|---|---|---|---|---|---|
Frequency of occurence | | | | | | | | |
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