Sun Flag Steel Mechanical Maintenance Engineer Interview Questions and Answers

Pumps work by creating a pressure difference to move fluid from one place to another.

• Pumps use mechanical energy to increase the pressure of a fluid and move it through a system

• They can be classified into different types such as centrifugal pumps, positive displacement pumps, etc.

• The working principle involves the conversion of mechanical energy into hydraulic energy

• Examples include water pumps in buildings, fuel pumps

Cooling towers work on the principle of evaporative cooling to remove heat from a process or building.

• Cooling towers use water as a cooling medium to absorb heat from a process or building.

• The hot water is pumped to the top of the tower and distributed over the fill media.

• As the water flows over the fill media, some of it evaporates, taking away heat and cooling the rest of the water.

• The cooled water is then collected ...read more

Pollution bag filter specifications include material type, filtration efficiency, airflow capacity, and pressure drop.

• Material type: Bag filters can be made of various materials such as polyester, polypropylene, or fiberglass.

• Filtration efficiency: This indicates the percentage of particles the filter can capture. Higher efficiency filters are more effective but may have higher pressure drops.

• Airflow capacity: The maxi...read more

The formula for centrifugal pump head is H = (Q * SG) / (3.14 * D^2 * 2.31)

• Head (H) is calculated using the flow rate (Q), specific gravity (SG), and diameter of the impeller (D)

• The formula is derived from the basic equation for head in a centrifugal pump

• Example: H = (100 gpm * 1.0) / (3.14 * 0.5^2 * 2.31) = 45.75 ft

Safety refers to measures taken to prevent accidents and injuries, while hazards are potential sources of harm or danger.

• Safety involves implementing protocols and procedures to minimize risks in the workplace

• Hazards are factors or situations that have the potential to cause harm

• Examples of hazards include electrical hazards, chemical hazards, and ergonomic hazards

• Safety measures may include training employees on prope...read more

Predictive maintenance is a proactive maintenance strategy that uses data analysis to predict when equipment failure is likely to occur.

• Uses data analysis to predict when equipment failure is likely to occur

• Helps in scheduling maintenance activities before a breakdown occurs

• Reduces downtime and increases equipment reliability

• Examples include vibration analysis, oil analysis, and thermography

Types of bearings include ball bearings, roller bearings, plain bearings, and fluid bearings.

• Ball bearings use balls to reduce friction between two surfaces.

• Roller bearings use cylindrical rollers to reduce friction.

• Plain bearings have a sliding surface instead of balls or rollers.

• Fluid bearings use a thin layer of liquid or gas to reduce friction.

• Examples: Ball bearings - deep groove ball bearing, Roller bearings - cy...read more

Petrol engines use spark ignition, while diesel engines use compression ignition.

• Petrol engines use a spark plug to ignite the air-fuel mixture, while diesel engines rely on compression to ignite the fuel.

• Petrol engines are lighter and more responsive, while diesel engines are more fuel efficient and have higher torque.

• Petrol engines are typically used in cars and motorcycles, while diesel engines are commonly found in

Types of gears include spur gears, helical gears, bevel gears, worm gears, rack and pinion gears, and planetary gears.

• Spur gears have straight teeth and are the simplest type of gear.

• Helical gears have angled teeth for smoother and quieter operation.

• Bevel gears have cone-shaped teeth and are used to change the direction of rotation.

• Worm gears have a screw-like appearance and provide high gear reduction ratios.

• Rack and ...read more

I have faced various hydraulic breakdowns in my career as a Mechanical Maintenance Engineer.

• One common hydraulic breakdown is a leak in the hydraulic system, which can be caused by worn-out seals or damaged hoses.

• Another issue is a hydraulic pump failure, which can occur due to excessive wear and tear or lack of proper maintenance.

• Clogged or blocked hydraulic filters can also lead to breakdowns, as they restrict the fl...read more

Hydraulic systems use liquid to transmit power, while pneumatic systems use compressed air.

• Hydraulic systems use incompressible fluids like oil or water, while pneumatic systems use compressed air or gas.

• Hydraulic systems can generate higher forces and are used in heavy machinery like cranes and excavators.

• Pneumatic systems are lighter and more flexible, commonly used in applications like air brakes in vehicles.

• Hydraul...read more