List of top Digital Electronics Questions

f(w, x, y, z) =\( \Sigma\) (0, 2, 5, 7, 8, 10, 13, 14, 15) 
Find the correct simplified expression. 
 

The figure shows a 4-to-1 multiplexer. The inputs are connected as: 
$I_0 = 1$,  $I_1 = 0$,  $I_2 = 1$,  $I_3 = y$. 
The select lines are $S_1 = x$ and $S_0 = z$. 
Find the Boolean function $f(x,y,z)$. 
 

What operation is performed by the given circuit?

In a 4-bit ripple counter, if the period of the waveform at the last flip-flop is 64 microseconds, then the frequency of the ripple counter in kHz is ______________. {(Answer in integer)}

Consider the given sequential circuit designed using D-Flip-flops. The circuit is initialized with some value (initial state). The number of distinct states the circuit will go through before returning back to the initial state is:

 

Given the following Karnaugh Map for a Boolean function \( F(w,x,y,z) \): 

Which one or more of the following Boolean expression(s) represent(s) \( F \)?

A dual-slope ADC has a fixed integration time of 100 ms. The reference voltage of the ADC is \(-5 \, {V}\). The time taken by the ADC to measure an input voltage of \(1.25 \, {V}\) is ________ ms (rounded off to the nearest integer).
A 1.3 digit digital voltmeter has a specified accuracy of \( \pm (0.5% \, {of reading} + 1 \, {digit}) \). If it is used to measure a 10 V DC voltage, the error in the measurement would be:
The 4-bit signed 2’s complement form of \( (-5)_{10} + (-5)_{10} \) is:

The minimized expression of the Boolean function Y(P, Q, R) implemented by the multiplexer (MUX) circuit shown in the figure is:


 

A dual-slope ADC has a fixed integration time of 100 ms. The reference voltage of the ADC is \(-5 \, {V}\). The time taken by the ADC to measure an input voltage of \(1.25 \, {V}\) is ________ ms (rounded off to the nearest integer).
A Boolean function \( X \) is given as \( X = AB + AC \). The reduced form of \( X \) is:

In a 4-bit ripple counter, if the period of the waveform at the last flip-flop is 64 microseconds, then the frequency of the ripple counter in kHz is ___________. (Answer in integer)

Consider the given sequential circuit designed using D-Flip-flops. The circuit is initialized with some value (initial state). The number of distinct states the circuit will go through before returning back to the initial state is:


 

In the circuit shown, the initial binary content of shift register A is $1101$ and that of shift register B is $1010$. The shift registers are positive–edge triggered, and the gates have no delay. When the shift control is high, what will be the binary content of the shift registers A and B after four clock pulses?
For the given digital circuit, $A=B=1$. Assume that AND, OR, and NOT gates have propagation delays of $10$ ns, $10$ ns, and $5$ ns respectively (wires have zero delay). Given that $C=1$ at turn–on, the frequency of steady–state oscillation of the output $Y$ is _____.
The simplified form of the Boolean function $F(W,X,Y,Z)=\Sigma(4,5,10,11,12,13,14,15)$ with the minimum number of terms and literals is _____
Choose the fastest logic family among the following:
The table shows the present state $Q(t)$, next state $Q(t{+}1)$, and a single control input for a flip-flop. Identify the flip-flop.
Match the Exclusive-OR (XOR) operations (i)–(iv) with the results (p)–(s), where $X$ is a Boolean input.
Neglecting the delays due to the logic gates in the circuit shown in figure, the decimal equivalent of the binary sequence \([ABCD]\) of initial logic states, which will not change with clock, is .............................. \begin{center} \includegraphics[width=0.55\textwidth]{28.jpeg} \end{center}
In a given 8-bit general purpose micro-controller there are following flags: C = Carry, A = Auxiliary Carry, O = Overflow flag, P = Parity (0 for even, 1 for odd). R0 and R1 are the two general purpose registers of the micro-controller. After execution of the following instructions, the decimal equivalent of the binary sequence of the flag pattern [CAOP] will be ........ \texttt{MOV R0, +0x60}
\texttt{MOV R1, +0x46}
\texttt{ADD R0, R1}
An 8-bit ADC converts analog voltage in the range of 0 to +5 V to the corresponding digital code as per the conversion characteristics shown in figure. For \(V_{in} = 1.9922 \, V\), which of the following digital output, given in hex, is true? \begin{center} \includegraphics[width=0.55\textwidth]{18.jpeg} \end{center}
What is the value of X in the following equation? (11101101000)_2 + (765)_16 = (X)_8
Given below are two statements:
Statement-I: In a linear block code, NAND operation of any two valid codewords creates another valid codeword.
Statement-II: To guarantee correction up to t errors in all cases, the minimum Hamming distance in a block code must be $d_{min}=2t+1$. 
In the light of the above statements, choose the correct answer from the options given below.