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The different equations of thermodynamics describe the relationships between energy, heat, and work in a system.
The first law of thermodynamics: ΔU = Q - W, where ΔU is the change in internal energy, Q is heat added to the system, and W is work done by the system.
The second law of thermodynamics: ΔS ≥ 0, where ΔS is the change in entropy of a closed system.
The ideal gas law: PV = nRT, where P is pressure, V is volume, ...
I was interviewed before May 2016.
Defence Research & Development Organisation interview questions for designations
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posted on 12 Aug 2024
I applied via Referral and was interviewed in Feb 2024. There was 1 interview round.
posted on 1 Mar 2024
I applied via Recruitment Consulltant and was interviewed in Feb 2024. There was 1 interview round.
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...
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 -...
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...
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...
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
posted on 19 Oct 2023
I applied via Company Website and was interviewed in Sep 2023. There was 1 interview round.
I applied via Company Website and was interviewed in Jan 2023. There were 3 interview rounds.
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...
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
Baud rate is the rate at which data is transmitted over a communication channel.
Baud rate is measured in bits per second (bps).
Higher baud rates allow for faster data transmission.
Baud rate must be set the same on both ends of the communication channel.
Incorrect baud rate settings can result in data corruption or loss.
Examples of communication channels that use baud rate include UART, SPI, and I2C.
I2C is a serial communication protocol used to connect multiple devices with two wires. Pull-up resistors are necessary for proper communication.
I2C uses a master-slave architecture where the master initiates communication.
Each device on the bus has a unique address assigned to it.
Data is transmitted in packets with a start and stop bit.
Pull-up resistors are necessary to ensure proper voltage levels on the bus.
The valu...
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