Gat Engineer Interview Questions and Answers for Freshers

Energy transfers in daily life involve converting energy from one form to another, like fossil fuels powering vehicles.

• Fossil fuels (e.g., gasoline) are burned in an engine, converting chemical energy to thermal energy.

• The thermal energy heats the engine, causing the expansion of gases that push the pistons.

• Piston movement converts linear motion into rotational motion via the crankshaft.

• The rotational motion is transferred to the wheels through the drivetrain, causing the veh...read more

Air is used in aircraft as a refrigerant due to its availability, low cost, non-toxic nature, and ability to easily dissipate heat.

• Air is readily available and can be easily compressed and expanded in aircraft systems.

• It is cost-effective compared to other refrigerants.

• Air is non-toxic and poses no harm to passengers or crew members.

• It has good heat transfer properties, allowing for efficient cooling of aircraft components.

The Second Law of Thermodynamics states that entropy in an isolated system always increases, leading to energy dispersal.

• Ice melting in a warm room: The structured ice (low entropy) becomes water (higher entropy) as it absorbs heat.

• A cup of hot coffee cooling down: Heat energy disperses into the surrounding air, increasing overall entropy.

• Mixing cream into coffee: The cream spreads out, increasing disorder and entropy in the system.

• A car engine: Fuel combustion converts order...read more

Types of valves in process control include globe valves, gate valves, ball valves, butterfly valves, and diaphragm valves.

• Globe valves: used for regulating flow in pipelines

• Gate valves: used for on/off control in pipelines

• Ball valves: quick shut-off valves with a spherical closure

• Butterfly valves: used for throttling flow with a disc

• Diaphragm valves: control flow with a flexible diaphragm

Strength of Materials is a branch of engineering that deals with the behavior of solid objects subjected to stresses and strains.

• Strength of Materials focuses on understanding how materials deform and fail under various types of loads.

• It involves studying concepts like stress, strain, elasticity, plasticity, and fracture mechanics.

• Applications include designing structures, machines, and components to ensure they can withstand expected loads without failure.

• Examples include ca...read more

The laws of thermodynamics are fundamental principles that govern the behavior of energy and matter in the universe.

• First Law: Energy cannot be created or destroyed, only transferred or converted.

• Second Law: The entropy of a closed system will always increase over time.

• Third Law: As temperature approaches absolute zero, the entropy of a system approaches a minimum value.

• Examples: A car engine converting fuel into motion (First Law), a cup of hot coffee cooling down in a room ...read more

Sensors and transducers are devices used to detect and convert physical quantities into electrical signals.

• Sensors detect physical quantities such as temperature, pressure, light, etc.

• Transducers convert the detected physical quantities into electrical signals.

• Examples include thermocouples for temperature sensing and strain gauges for pressure sensing.