10+ Qatar Airways Diploma Mechanical Engineer Interview Questions and Answers

A circular object that rotates around an axis and is used for transportation or machinery.

• A wheel is typically made of metal or rubber and can be found on vehicles such as cars, bicycles, and trucks.

• Wheels are also used in machinery such as conveyor belts and pulleys.

• The invention of the wheel is considered one of the most important inventions in human history.

• Wheels can come in different sizes and shapes depending on their intended use.

• The rotation of a wheel can be used to ...read more

Rediyeato is not a known term in mechanical engineering.

Gearbox is a mechanical device that transmits power from an engine to the wheels.

• It is used to change the speed and torque of a vehicle.

• It contains gears of different sizes that mesh with each other to transmit power.

• It can be manual or automatic depending on the type of vehicle.

• Examples include a manual transmission in a car or a gearbox in a wind turbine.

A diesel engine is an internal combustion engine that uses diesel fuel to power its operation.

• Diesel engines are commonly used in heavy-duty vehicles such as trucks, buses, and trains.

• They are more fuel-efficient than gasoline engines and produce less carbon dioxide emissions.

• Diesel engines work by compressing air in the cylinder and then injecting diesel fuel into the compressed air, causing combustion.

• They are known for their durability and longevity, making them a popular ...read more

A petrol engine is an internal combustion engine that uses petrol as fuel to power the vehicle.

• Petrol engine is also known as gasoline engine.

• It converts the chemical energy of petrol into mechanical energy.

• It has four strokes: intake, compression, combustion, and exhaust.

• Examples include engines used in cars, motorcycles, and small aircraft.

• It is less fuel-efficient than diesel engines but produces more power.

A pump is a mechanical device used to move fluids from one place to another.

• Pumps are used in various industries such as water treatment, oil and gas, and chemical processing.

• They can be classified into two types: positive displacement pumps and centrifugal pumps.

• Examples of pumps include water pumps, fuel pumps, and vacuum pumps.

• Pumps can be powered by electricity, diesel engines, or even human power.

• Pumps are essential in many applications where fluids need to be transporte...read more

Connecting rod is a component in an engine that connects the piston to the crankshaft.

• It is a vital component in the engine that converts the reciprocating motion of the piston into rotary motion of the crankshaft.

• It is usually made of steel or aluminum alloy.

• It is subjected to high stress and must be designed to withstand the forces generated by the engine.

• It is attached to the piston by a piston pin and to the crankshaft by a connecting rod bearing.

• Examples of engines that ...read more

Exhaust is the waste gases or steam expelled from an engine, turbine, or other machine.

• Exhaust is produced when fuel is burned in an engine.

• It contains harmful pollutants such as carbon monoxide, nitrogen oxides, and particulate matter.

• Exhaust systems in vehicles are designed to reduce emissions and noise.

• Exhaust gases can also be used to power turbines and generate electricity.

• Regular maintenance of exhaust systems is important to ensure proper functioning and prevent leaks.

An engine is a machine that converts fuel into mechanical energy to power vehicles or machinery.

• Engines come in various types such as internal combustion, diesel, electric, and hybrid.

• They are used in cars, trucks, airplanes, boats, generators, and more.

• The engine's main components include cylinders, pistons, crankshaft, and camshaft.

• The engine's power output is measured in horsepower (hp) or kilowatts (kW).

AC stands for Alternating Current.

• AC is a type of electrical current that periodically reverses direction.

• It is commonly used in household appliances and power transmission.

• AC voltage and frequency vary depending on the country and region.

• AC can be converted to DC (Direct Current) using a rectifier.

• AC is measured in units of Hertz (Hz).