Blue Cross Laboratories Interview Questions and Answers

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

• Engines come in various types, including gasoline, diesel, electric, and hybrid.

• They work by igniting fuel in a combustion chamber, which creates pressure that moves pistons and turns a crankshaft.

• The power generated by the engine is used to propel a vehicle or operate machinery.

• Engines require regular maintenance to ensure optimal performance and longevity.

• Examples of engin...read more

An engine converts fuel into mechanical energy to power a vehicle or machine.

• Fuel is ignited in a combustion chamber, creating high-pressure gases that push pistons.

• The pistons turn a crankshaft, which converts the up-and-down motion into rotational motion.

• The rotational motion is transferred to the wheels or other machinery to create movement.

• Different types of engines include gasoline, diesel, electric, and hybrid.

• Efficiency and power output can be improved through technolo...read more

A flywheel is a mechanical device used to store rotational energy. It is used in various applications such as engines and power plants.

• Flywheels are used to maintain a constant speed in machines that experience fluctuations in power supply.

• They are also used to store energy and release it when needed, such as in hybrid cars.

• Flywheels can be made of various materials such as steel, aluminum, and carbon fiber.

• They are commonly used in engines, power plants, and heavy machinery....read more

The crankshaft converts reciprocating motion into rotational motion.

• Converts linear motion into rotational motion

• Transfers power from pistons to drive train

• Consists of main journals, rod journals, and crankpins

• Balancing is important to reduce vibration and wear

• Commonly made of forged steel or cast iron

• Used in internal combustion engines, steam engines, and pumps

Earthing test is done to ensure proper grounding of electrical equipment and to prevent electrical hazards.

• Disconnect the equipment from the power source

• Connect the earth tester to the equipment's earthing point

• Measure the resistance between the earthing point and the ground

• Ensure the resistance is within the acceptable range

• Repeat the test periodically to ensure continued safety

Megger is used to measure insulation resistance in electrical systems.

• Megger is a type of insulation tester used to measure the resistance of insulation in electrical systems.

• It is used to detect any insulation breakdown or leakage in the system.

• The Megger applies a high voltage to the insulation and measures the resulting current flow.

• The resistance value is then displayed on the Megger's screen.

• Megger testing is important for ensuring the safety and reliability of electrica...read more

SI engines use spark plugs for ignition, while CI engines use compression for ignition.

• SI engines have a spark plug to ignite the air-fuel mixture, while CI engines rely on compression to ignite the fuel.

• SI engines are used in petrol/gasoline vehicles, while CI engines are commonly found in diesel vehicles.

• SI engines have a higher power-to-weight ratio compared to CI engines.

• SI engines are more fuel-efficient at low loads, while CI engines are more efficient at high loads.

• SI ...read more