Defence Research & Development Organisation Scientist Interview Questions and Answers

There are three laws of thermodynamics. Each law has specific applications. dB Amp is not related to thermodynamics.

• The first law of thermodynamics, also known as the law of energy conservation, states that energy cannot be created or destroyed, only transferred or transformed.

• The second law of thermodynamics states that the entropy of an isolated system always increases over time.

• The third law of thermodynamics states...read more

Spark plug ignites fuel-air mixture in IC engines. DTSI improves combustion efficiency. 2-stroke and 4-stroke engines differ in number of strokes per cycle.

• Spark plug ignites the fuel-air mixture in the combustion chamber

• DTSI (Digital Twin Spark Ignition) is a technology used to improve combustion efficiency by using two spark plugs

• 2-stroke engines complete one power stroke in two strokes of the piston, while 4-stroke ...read more

Humidity ratio is measured using two types of instruments: psychrometers and hygrometers.

• Psychrometers measure humidity ratio by comparing the readings of two thermometers: a dry-bulb and a wet-bulb thermometer.

• Hygrometers measure humidity ratio using various principles such as electrical resistance, capacitance, or condensation.

• A 1 ton refrigerator refers to the cooling capacity of the refrigerator, which is equivalen...read more

I would like to design electronic components with heat transfer applications.

• I have a strong interest in electronics and how heat can be managed in electronic systems.

• I enjoy working on projects that involve designing and optimizing electronic components for efficient heat dissipation.

• I have experience in conducting thermal analysis and simulations to ensure proper heat transfer in electronic devices.

• I find it fascinat...read more

The choice between Al and Mg for designing depends on the specific requirements and constraints of the project.

• Aluminum (Al) is lightweight, corrosion-resistant, and has good thermal conductivity, making it suitable for applications where weight reduction is important, such as aerospace.

• Magnesium (Mg) is even lighter than aluminum, but it has lower strength and is more prone to corrosion. It is commonly used in automot...read more

A rocket is a vehicle that propels itself through the atmosphere or space, while a missile is a weapon that is guided towards a target.

• Rockets are used for space exploration, satellite launches, and transportation, while missiles are used for military purposes.

• Rockets are typically unmanned and used for peaceful purposes, while missiles are often armed and used for warfare.

• Rockets are designed to carry payloads such as...read more

The minimum temperature of any substance that we could reach and use for practical purposes is absolute zero, which is -273.15 degrees Celsius or 0 Kelvin.

• The minimum temperature is known as absolute zero.

• It is the lowest possible temperature that can be reached.

• At absolute zero, all molecular motion ceases.

• Practical applications include cryogenics and superconductivity.

• Examples of practical uses are in medical imaging

Mathematics is applied in various ways in the field of research science.

• Mathematics is used to develop and analyze models and algorithms.

• It is used in statistical analysis and data interpretation.

• Mathematical equations and formulas are used to describe and predict phenomena.

• Mathematical optimization techniques are applied to solve complex problems.

• Mathematics is used in designing experiments and conducting simulations.

• ...read more