Defence Research & Development Organisation Ai Ml Engineer Interview Questions and Answers

Basic leetcode problems

Q1. Basic java questions
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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. Working of NVR and troubleshooting of same
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NVR stands for Network Video Recorder, used for recording and storing video footage from IP cameras.
• NVR records video footage from IP cameras onto a hard drive or storage device.

• Troubleshooting NVR involves checking network connections, power supply, and storage capacity.

• Common issues include network connectivity problems, insufficient storage space, and power supply failures.
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Q2. What is earthing
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Earthing is the process of connecting electrical systems to the ground to prevent electric shock and protect equipment.
• Earthing helps to prevent electric shock by providing a path for fault currents to flow safely into the ground.

• It also helps to protect electrical equipment from damage caused by lightning strikes or power surges.

• Earthing is essential in electrical systems to ensure safety and proper functioning.

• Exampl...read more
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Q3. How to check input and output voltage
Ans. 
To check input and output voltage, use a multimeter to measure the voltage at the input and output terminals of the device.
• Set the multimeter to the voltage measurement setting.

• Connect the black probe to the ground terminal and the red probe to the input terminal to measure input voltage.

• Repeat the process for the output terminal to measure output voltage.

• Ensure the voltage readings are within the specified range for t
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Q4. Colour coding of cat6 cable
Ans. 
Cat6 cables are typically color coded for easy identification and organization.
• Cat6 cables are often color coded according to the TIA/EIA-568-B standard

• The standard color code for Cat6 cables includes solid colors like blue, orange, green, and brown, as well as striped versions of those colors

• Color coding helps in quickly identifying and organizing cables in a network setup
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Q1. What is the sheet metal process
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Sheet metal process involves cutting, bending, and assembling metal sheets to create various products.
• Cutting: Using tools like shears, lasers, or plasma cutters to cut the metal sheets into desired shapes

• Bending: Utilizing press brakes to bend the metal sheets at specific angles

• Assembling: Joining the bent and cut metal sheets together using techniques like welding or fasteners

• Finishing: Applying coatings or finishes ...read more
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Q2. Types of Tolerances and explanation
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Types of tolerances include bilateral, unilateral, limit, and fit tolerances.
• Bilateral tolerance: Allows for variation in both directions from the nominal dimension.

• Unilateral tolerance: Allows for variation in only one direction from the nominal dimension.

• Limit tolerance: Specifies the maximum and minimum acceptable limits for a dimension.

• Fit tolerance: Determines the acceptable range of tightness or looseness between
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Q1. Define the factor of safety?
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Factor of safety is a design parameter that accounts for uncertainties in material properties and loading conditions.
• Factor of safety is the ratio of the maximum stress a material can withstand to the maximum stress it is subjected to in a given application.

• It ensures that the structure or component will not fail under normal operating conditions.

• Higher factor of safety values indicate a more conservative design approa...read more
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Q2. What is tolerance?
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Tolerance refers to the allowable variation in dimensions or properties of a part or product.
• Tolerance is important in engineering to ensure proper fit and function of components.

• It is typically specified as a range of acceptable values, such as +/- 0.1mm.

• Tolerance can be applied to dimensions, material properties, surface finish, etc.

• For example, a hole may have a tolerance of +/- 0.05mm to allow for proper alignment
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Q1. Multithreading using Rtos
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Multithreading using RTOS involves creating multiple threads to run concurrently, managed by a real-time operating system.
• RTOS provides scheduling and synchronization mechanisms for managing multiple threads.

• Threads in RTOS can have different priorities to ensure timely execution of critical tasks.

• Example: Using FreeRTOS to create multiple threads for handling different tasks in an embedded system.
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First levelWe can choose among different layer, webapi, UI and they asked to write sample program in 90 mins. Second level was really bad though. Will be asked to write code basics to advanced.

Q1. Second level was also coding.
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Q1. Ups, inverter, generator operator, electrical
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Q2. Electrical diploma in AICTE
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Q3. Any type of electrical
Ans. 
Yes, I have experience working with various types of electrical systems.
• I have worked with both AC and DC electrical systems.

• I am familiar with electrical wiring and circuitry.

• I have experience troubleshooting electrical issues and repairing faulty components.

• I am knowledgeable about electrical safety protocols and regulations.

• Examples of electrical systems I have worked with include lighting systems, HVAC systems, and
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Q4. Electrical knowledge
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Q5. What is the role of electrical equipment.
Ans. 
Electrical equipment plays a crucial role in powering and controlling various systems and processes.
• Electrical equipment is responsible for generating, distributing, and controlling power in various industries.

• It is used in a wide range of applications, from simple household appliances to complex industrial machinery.

• Electrical equipment includes generators, transformers, motors, switches, and control systems.

• It is ess...read more
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Q6. How are the generate electricity
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Electricity is generated through various methods including thermal, hydro, nuclear, and renewable sources.
• Thermal power plants burn fossil fuels like coal, oil, and gas to generate steam that drives turbines to produce electricity.

• Hydroelectric power plants use the force of falling water to turn turbines and generate electricity.

• Nuclear power plants use nuclear reactions to heat water and produce steam that drives turb...read more
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