List of top Digital Electronics Questions

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:

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) \( F \)?

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:


 

What operation is performed by the given circuit?
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.
Given below are two statements, one is labelled as Assertion (A) and the other is labelled as Reason (R):
Assertion (A): The ENABLE input of an $m: 2^m$ decoder can be used to increase its size.
Reason (R) :  The ENABLE input in an $m: 2^m$ decoder can be used as the $(m+1)^{th}$ input to result in a$ (m+1): 2^{m+1} $ decoder. 
In the light of the above statements, choose the correct answer from the options given below.
For the monostable multivibrator timer 555 circuit with $R_A=7.5kΩ $ and $C=0.1 uF$, find out the period of the output waveform.
The frequency of oscillations at the output of an astable multivibrator using Schmitt trigger directly depends on
An m: n decoder is used to enable 16 devices. The value of m is
The input-output characteristics of a Schmitt trigger is given in figure.
The noise margin of the Schmitt Trigger is___
The input-output characteristics of a Schmitt trigger
The resolution for n-bit system D/A Converter is__
If ⊕ and ⊙ denote the exclusive OR and exclusive NOR operations, respectively, then which one of the following is not correct?
A 32:1 MUX can can be designed using:
The stack pointer in a microprocessor is a
Which of the following interrupts is non-maskable in 8085 microprocessor?
The numbers of 1s in Binary representation of (3× 4096 + 12×256+ 5x16+3) are
Which processor provide 1 MB memory
The decimal number equivalent of (4057.06)8 is
What is the maximum number of different Boolean function involving n Boolean variables?