Defence Research & Development Organisation Junior Researcher Interview Questions and Answers

Q1. Explain your B Tech project in detail
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Q2. Why HAL u want to join
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Q1. Related to aeronautics
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Q1. Salary discussion,documentation and bond details
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Q1. Why the brittle material fail as spiral fracture surface under torsion
Ans. 
Brittle materials fail as spiral fracture surface under torsion due to their inability to deform plastically.
• Brittle materials lack ductility and are unable to deform plastically under stress

• Under torsion, the material experiences shear stress which leads to the formation of spiral fracture surfaces

• The lack of plastic deformation causes the material to fail catastrophically along these spiral paths

• Examples of brittle m...read more
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Q2. What is entropy
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Entropy is a measure of disorder or randomness in a system.
• Entropy is a thermodynamic property that quantifies the amount of energy in a physical system that is not available to do work.

• It is a measure of the number of possible arrangements of particles in a system.

• Entropy tends to increase in isolated systems over time, leading to a state of maximum disorder or equilibrium.

• An example of entropy is the melting of ice -...read more
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Q3. How to find natural frequency practically
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Natural frequency can be found practically by conducting modal analysis or using specialized equipment like accelerometers.
• Conduct modal analysis by applying a force or impulse to the structure and measuring the resulting vibrations.

• Use specialized equipment like accelerometers to measure the vibrations of the structure.

• Calculate the natural frequency using the formula: f = 1 / (2π√(k/m)), where f is the natural freque...read more
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Q4. What is Fast Fourier transform
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Fast Fourier Transform (FFT) is an algorithm used to compute the Discrete Fourier Transform (DFT) of a sequence or signal.
• FFT is used to analyze the frequency content of a signal by decomposing it into its constituent frequencies.

• It is commonly used in signal processing, image processing, audio analysis, and many other fields.

• FFT algorithms are much faster than the naive DFT computation, making it practical for real-ti...read more
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Q5. How FFT is different from DFT
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FFT is a faster algorithm for calculating DFT
• FFT is faster than DFT in terms of computation time

• FFT uses a divide-and-conquer approach to reduce the number of operations

• DFT computes all frequencies while FFT only computes the frequencies of interest

• FFT is commonly used in signal processing applications
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Q1. How to major resistance by old method
Ans. 
Major resistance by old method involves using traditional techniques to determine the level of resistance in a material.
• Use manual testing methods such as scratch testing or hardness testing to assess resistance

• Refer to historical data or records of similar materials for comparison

• Consult with experienced professionals who have knowledge of traditional resistance testing methods
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Q1. What was your previous job profile
Ans. 
I was previously working as a Software Engineer at XYZ Company.
• Developed and maintained software applications

• Collaborated with cross-functional teams to gather requirements and design solutions

• Implemented new features and enhancements

• Performed code reviews and debugging

• Participated in agile development processes
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Q2. Basic electronics questions
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Q3. With which test equipment you are familiar with
Ans. 
I am familiar with a wide range of test equipment including oscilloscopes, multimeters, signal generators, and power supplies.
• Oscilloscopes: Tektronix TDS2024B, Agilent DSO-X 2002A

• Multimeters: Fluke 87V, Keysight U1253B

• Signal generators: Tektronix AFG3102, Agilent 33220A

• Power supplies: Agilent E3631A, Tektronix PS2520G
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Q4. How you are in fault rectification
Ans. 
I have a systematic approach to fault rectification, starting with identifying the root cause and then implementing a solution.
• I begin by gathering information about the problem and analyzing it thoroughly

• I then identify the root cause of the issue and prioritize the most critical problems

• I develop a plan of action and implement a solution, testing it thoroughly to ensure it is effective

• I document the entire process fo...read more
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Q5. On which frequency band your system was working.
Ans. 
Our system operates on the 2.4 GHz frequency band.
• Our system uses the 2.4 GHz frequency band for communication.

• This frequency band is commonly used for Wi-Fi and Bluetooth devices.

• It has a range of approximately 30 meters indoors.

• The 2.4 GHz band is susceptible to interference from other devices operating on the same frequency.

• Our system has been optimized to minimize interference and ensure reliable communication.
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Q6. Are you ready to travel frequently to different locations within India.
Ans. 
Yes, I am ready to travel frequently to different locations within India.
• I have a flexible schedule and am willing to travel as required.

• I have previous experience traveling for work.

• I understand the importance of being adaptable and open to new locations.

• I am familiar with the travel logistics within India.

• I am excited about the opportunity to explore different parts of the country.
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Normal aptitude questions were asked.

Q1. Just previous experience related discussion only
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Q2. Most standard question, Why you want to join BEL 😄
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Q1. Test on basic electronics
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Q1. With group of experts
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