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30+ Viele Decor Interview Questions and Answers

Updated 26 Nov 2024
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Q1. Add capacitor parallel to one resistor and tell frequency response

Ans.

Adding a capacitor in parallel to a resistor changes the frequency response of the circuit.

  • The cutoff frequency of the circuit decreases as the capacitance increases.

  • The circuit becomes a high-pass filter with a -20dB/decade slope above the cutoff frequency.

  • The impedance of the capacitor decreases as frequency increases, allowing more current to flow through the circuit.

  • The resistor and capacitor form a voltage divider, affecting the gain of the circuit at different frequenci...read more

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Q2. Arrange 4 balls in space such that they are equidistant from each other

Ans.

Arrange 4 balls equidistant from each other in space.

  • Place 3 balls in a triangle formation on the same plane

  • Place the 4th ball directly above the center of the triangle

  • Ensure that the distance between each ball is equal

  • Alternatively, place the 4 balls at the vertices of a tetrahedron

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Q3. Resistances R, 5R, 9R, 13R... are placed in series. What is the cumulative resistance

Ans.

Resistances in series: R, 5R, 9R, 13R... What is the cumulative resistance?

  • Add all resistances to get the cumulative resistance

  • Cumulative resistance = R + 5R + 9R + 13R + ...

  • The formula for the nth term is Tn = R + (n-1)4R

  • The sum of n terms is Sn = n/2(2R + (n-1)4R)

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Q4. Add resistor to the capacitor and tell frequency response

Ans.

Adding a resistor to a capacitor changes the frequency response of the circuit.

  • The cutoff frequency of the circuit decreases with increasing resistance.

  • The circuit becomes more attenuative at higher frequencies.

  • The time constant of the circuit increases with increasing resistance.

  • The circuit becomes more stable and less prone to oscillation.

  • Example: A low-pass filter with a 10uF capacitor and a 1kohm resistor has a cutoff frequency of 15.9Hz.

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Q5. What is the rough output of a black box that kills lie frequencies, taking a rectangular pulse as input

Ans.

The rough output of the black box is a rectangular pulse with the lie frequencies removed.

  • The black box filters out lie frequencies from the input rectangular pulse.

  • The output is a rectangular pulse with only the truthful frequencies remaining.

  • The exact shape and characteristics of the output pulse depend on the specific design of the black box.

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Q6. How can you swap the values of 2 variables without using a 3rd temporary variable. FOLLOW UP: how can this be generalized for cyclic rotations of 3,4... N variables

Ans.

To swap the values of 2 variables without a temporary variable, use bitwise XOR operation.

  • Use bitwise XOR operation to swap the values of two variables without a temporary variable

  • For example, if a = 5 and b = 7, after swapping, a = 2 and b = 5

  • To generalize for cyclic rotations of N variables, use a loop and bitwise XOR operation

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Q7. If two sine waves of different frequency are added will resultant wave be periodic. If so what is period

Ans.

Yes, the resultant wave will be periodic with a period equal to the least common multiple of the two frequencies.

  • The period of the resultant wave is determined by the least common multiple of the two frequencies.

  • If the frequencies are incommensurable, the resultant wave will not be periodic.

  • If the frequencies are harmonically related, the resultant wave will have a period equal to the fundamental period of the lower frequency.

  • The amplitude and phase of the resultant wave will...read more

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Q8. XOR Query Problem Statement

Assume you initially have an empty array called ARR. You are required to return the updated array after executing Q number of queries on this array.

There are two types of queries to...read more

Ans.

The problem requires updating an array based on a series of queries, where each query can either insert a value or perform a bitwise XOR operation on all elements.

  • Use a loop to iterate through each query and update the array accordingly

  • For type 1 query, append the value to the end of the array

  • For type 2 query, perform a bitwise XOR operation on each element of the array with the given value

  • Return the updated array after processing all the queries

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Q9. If a sine wave is sampled at 1.5 times its original frequency, can the original wave be retained? (Ans: Yes)

Ans.

Sampling a sine wave at 1.5 times its original frequency retains the original wave.

  • The original wave can be reconstructed using interpolation techniques.

  • The Nyquist-Shannon sampling theorem states that a signal can be perfectly reconstructed if it is sampled at twice its highest frequency component.

  • Sampling at 1.5 times the original frequency satisfies the Nyquist-Shannon sampling theorem.

  • This technique is used in digital audio processing.

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Q10. How can a 2:1 multiplexer be used as an AND gate

Ans.

A 2:1 multiplexer can be used as an AND gate by connecting one input to logic 1 and the other input to the desired input signal.

  • Connect one input of the 2:1 multiplexer to logic 1 (high voltage) and the other input to the desired input signal.

  • Set the select input of the multiplexer to logic 0 (low voltage) to select the input connected to logic 1.

  • The output of the multiplexer will then be the logical AND of the selected input and the desired input signal.

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Q11. Josephus Problem Statement

Consider 'N' individuals standing in a circle, numbered consecutively from 1 to N, in a clockwise direction. Initially, the person at position 1 starts counting and will skip K-1 pers...read more

Ans.

This question is about finding the position of the last person surviving in a circle of N people, where each person kills the Kth person in a clockwise direction.

  • Implement a function that takes the number of test cases, N, and K as input

  • For each test case, simulate the killing process by iterating through the circle and skipping K-1 people

  • Keep track of the position of the last person surviving and return it as the output

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Q12. Largest Rectangle in Histogram Problem Statement

You are given an array/list HEIGHTS of length N, where each element represents the height of a histogram bar. The width of each bar is considered to be 1.

Your t...read more

Ans.

The task is to find the largest rectangle possible in a given histogram and return its area.

  • Iterate through the histogram and maintain a stack to keep track of the indices of the bars in non-decreasing order of heights.

  • For each bar, calculate the area of the rectangle that can be formed using that bar as the smallest bar.

  • To calculate the area, pop the bars from the stack until a bar with a smaller height is encountered.

  • The width of the rectangle will be the difference between...read more

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Q13. What does odd and even harmonics of fourier series signify

Ans.

Odd harmonics represent asymmetry in a signal while even harmonics represent symmetry.

  • Odd harmonics are multiples of the fundamental frequency and have a phase shift of 90 degrees.

  • Even harmonics are also multiples of the fundamental frequency but have a phase shift of 0 degrees.

  • Odd harmonics represent the asymmetry in a signal, while even harmonics represent the symmetry.

  • For example, a square wave has odd harmonics only, while a triangle wave has both odd and even harmonics.

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Q14. Meeting Rooms Allocation Problem Statement

Stark Industry is planning to organize meetings for various departments in preparation for Stark Expo. Due to limited rooms in Stark Tower, the goal is to allocate mee...read more

Ans.

The task is to find the minimum number of conference rooms required to organize all the meetings.

  • Sort the meetings based on their start time.

  • Initialize a priority queue to store the end times of the meetings in ascending order.

  • Iterate through the sorted meetings and check if the start time of the current meeting is greater than the end time of the meeting at the top of the priority queue.

  • If it is, remove the meeting from the priority queue.

  • Add the end time of the current meet...read more

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Q15. Maximum Sum Rectangle Problem

Given an M x N matrix of integers ARR, your task is to identify the rectangle within the matrix that has the greatest sum of its elements.

Input:

The first line of input contains a...read more
Ans.

The task is to find the maximum sum rectangle in a given matrix of integers.

  • Iterate through all possible rectangles in the matrix

  • Calculate the sum of each rectangle

  • Keep track of the maximum sum rectangle found so far

  • Return the maximum sum

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Q16. Draw a functional block diagram of a transducer

Ans.

A transducer is a device that converts one form of energy into another. It typically consists of a sensor, signal conditioning circuitry, and an output interface.

  • A transducer converts one form of energy into another.

  • It consists of a sensor that detects the input energy.

  • Signal conditioning circuitry processes and amplifies the sensor signal.

  • The output interface converts the processed signal into a usable form.

  • Examples of transducers include microphones, thermocouples, and pres...read more

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Q17. String Palindrome Verification

Given a string, your task is to determine if it is a palindrome considering only alphanumeric characters.

Input:

The input is a single string without any leading or trailing space...read more
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Q18. Snake and Ladder Problem Statement

Given a 'Snake and Ladder' board with N rows and N columns, where positions are numbered from 1 to (N*N) starting from the bottom left, alternating direction each row, find th...read more

Ans.

The question is about finding the minimum number of throws required to reach the last cell on a Snake and Ladder board.

  • The board is represented as a 2D matrix with N rows and N columns.

  • Each square on the board can have a snake or ladder, represented by a non-negative number.

  • The destination of a snake or ladder is the value at the corresponding square.

  • You can only take a snake or ladder once per move.

  • If the destination of a snake or ladder is the start of another snake or ladd...read more

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Q19. Explain Fourier Series based on your understanding

Ans.

Fourier series is a mathematical representation of a periodic function as a sum of sine and cosine functions.

  • Fourier series is used to analyze and synthesize periodic signals.

  • It decomposes a periodic function into a sum of sine and cosine functions with different frequencies and amplitudes.

  • The Fourier coefficients represent the amplitude and phase of each frequency component.

  • The Fourier series can be used to approximate non-periodic functions by extending the function periodi...read more

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Q20. N Stacks in an Array Problem Statement

Design a data structure that implements ‘N’ stacks using a single array of size ‘S’. The data structure should support the following operations:

  • push(X, M): Pushes an ele...read more
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Q21. Factorial Calculation Problem Statement

Develop a program to compute the factorial of a given integer 'n'.

The factorial of a non-negative integer 'n', denoted as n!, is the product of all positive integers les...read more

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Q22. Explain aliasing, nyquist sampling theorem

Ans.

Aliasing occurs when a signal is sampled at a rate lower than the Nyquist rate, resulting in distorted or incorrect signal representation.

  • Nyquist sampling theorem states that a signal must be sampled at a rate at least twice its highest frequency component to avoid aliasing.

  • Aliasing can be avoided by using a low-pass filter to remove high-frequency components before sampling.

  • Examples of aliasing include the wagon-wheel effect in movies and the distorted sound of a guitar stri...read more

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Q23. explain the working of a capacitor and resistor and relation between resistance and length , area

Ans.

Capacitors store electrical energy while resistors limit the flow of current. Resistance is directly proportional to length and inversely proportional to area.

  • Capacitors store electrical energy by creating an electric field between two conductive plates separated by an insulating material

  • Resistors limit the flow of current in a circuit by dissipating energy in the form of heat

  • The resistance of a resistor is directly proportional to its length and inversely proportional to its...read more

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Q24. Find the voltage through the resistor

Ans.

To find the voltage through a resistor, use Ohm's Law: V = I * R

  • Use Ohm's Law: V = I * R, where V is the voltage, I is the current flowing through the resistor, and R is the resistance of the resistor

  • If the current flowing through the resistor is 2A and the resistance is 5 ohms, the voltage would be V = 2 * 5 = 10V

  • Make sure to use the correct units for current (Amps) and resistance (Ohms) to get the voltage in Volts

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Q25. CMOS inverter characteristics

Ans.

CMOS inverter is a fundamental building block in digital integrated circuits, with characteristics like high input impedance, low output impedance, and high gain.

  • CMOS inverter consists of a PMOS and NMOS transistor connected in series.

  • It has high input impedance due to the PMOS transistor and low output impedance due to the NMOS transistor.

  • The voltage transfer characteristic of a CMOS inverter is typically nonlinear.

  • It has high gain and can be used for logic inversion in digi...read more

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Q26. What is diffrence between xor and elastic codec

Ans.

XOR is a logical operation that outputs true only when inputs differ, while elastic codec is a compression algorithm used in video streaming.

  • XOR is a logical operation that outputs true only when inputs differ

  • Elastic codec is a compression algorithm used in video streaming

  • XOR is commonly used in cryptography for encryption purposes

  • Elastic codec helps in reducing the size of video files for efficient streaming

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Q27. Series combination of resistor

Ans.

In a series combination of resistors, the total resistance is the sum of individual resistances.

  • Total resistance is calculated by adding the individual resistances in the series.

  • Current remains the same throughout the series combination.

  • Voltage is divided among the resistors based on their individual resistances.

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Q28. How to create a netlist for a 100x100x100 circuit

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Q29. How to divide clock frequency by 2

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Q30. What is tdl in memory testing

Ans.

TDL stands for Test Data Load in memory testing, used to load test data into memory for testing purposes.

  • TDL is a process in memory testing where test data is loaded into memory to simulate real-world usage scenarios.

  • It helps in identifying memory leaks, performance issues, and other memory-related problems.

  • Examples of TDL tools include MemTest86, RAMMon, and MemTest.

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Q31. Difference between latch and flipflop

Ans.

Latch is level triggered, while flip-flop is edge triggered. Latch is asynchronous, while flip-flop is synchronous.

  • Latch is level triggered, meaning it changes output when the input signal is high or low continuously.

  • Flip-flop is edge triggered, meaning it changes output only on the rising or falling edge of the clock signal.

  • Latch is asynchronous, meaning the output changes as soon as the input changes.

  • Flip-flop is synchronous, meaning the output changes only at the rising or...read more

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Q32. Full form of PN Junction DIode.

Ans.

PN Junction Diode stands for Positive-Negative Junction Diode.

  • PN Junction Diode is a semiconductor device formed by joining a P-type semiconductor with an N-type semiconductor.

  • It allows current to flow in one direction only, from the P-type region to the N-type region.

  • Commonly used in rectifiers, voltage regulators, and signal demodulation.

  • Example: 1N4148 is a popular PN Junction Diode.

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Q33. R L C circuits in various configuration

Ans.

R L C circuits are electrical circuits that contain resistors, inductors, and capacitors in various configurations.

  • RLC circuits can be series, parallel, or a combination of both.

  • In series RLC circuits, the components are connected in a line along the same current path.

  • In parallel RLC circuits, the components are connected across the same voltage source.

  • Examples include band-pass filters, low-pass filters, and resonant circuits.

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Q34. Voltage transfer fuctions of inverter.

Ans.

Voltage transfer functions of inverters describe how input voltage is transformed into output voltage.

  • Voltage transfer functions show the relationship between input and output voltages of an inverter.

  • They are typically represented in the frequency domain as a function of frequency.

  • Inverters can have different transfer functions based on their design and control strategy.

  • Examples include voltage-source inverters and current-source inverters.

  • Transfer functions are important for...read more

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Q35. Longest common subsequence

Ans.

The longest common subsequence problem is finding the longest subsequence that two or more strings have in common.

  • A subsequence is a sequence that can be derived from another sequence by deleting some or no elements without changing the order of the remaining elements.

  • The longest common subsequence does not require consecutive elements.

  • Dynamic programming is commonly used to solve this problem efficiently.

  • Example: For strings 'ABCD' and 'ACDF', the longest common subsequence ...read more

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Q36. Implementation of query

Ans.

The implementation of a query

  • Understand the requirements of the query

  • Design the query based on the database structure

  • Write the query using appropriate syntax and functions

  • Test the query to ensure it returns the desired results

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Q37. Full form of DV

Ans.

DV stands for Digital Video.

  • DV is a format used for recording and playing back digital video.

  • It is commonly used in camcorders and digital cameras.

  • DV files have a .dv file extension.

  • DV video has a resolution of 720x480 pixels for standard definition or 720x576 pixels for PAL systems.

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Q38. Setup time vs hold time

Ans.

Setup time is the minimum time required for the input signal to be stable before the clock edge, while hold time is the minimum time the input signal must be held stable after the clock edge.

  • Setup time ensures that the input signal has settled before the clock edge to avoid timing violations.

  • Hold time ensures that the input signal remains stable after the clock edge to prevent data corruption.

  • Examples: In a flip-flop, setup time is the time before the clock edge when the data...read more

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Q39. wire vs reg in verilog

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