Kilburn Engineering Interview Questions and Answers

Sand blasting is required to remove old paint, rust, and other contaminants from surfaces before painting.

• Sand blasting helps create a clean and smooth surface for paint adhesion.

• It removes old paint, rust, scale, and other surface contaminants.

• Sand blasting also helps in profiling the surface, providing better paint adhesion.

• It is an effective method for preparing surfaces made of metal, concrete, or wood.

• Sand blastin...read more

Zinc is widely used for surface coating on iron sheets for galvanizing.

• Zinc is commonly used as a protective coating for iron sheets to prevent corrosion.

• The process of coating iron sheets with zinc is known as galvanizing.

• Zinc provides a sacrificial layer that corrodes instead of the iron, extending the lifespan of the metal.

• Galvanized iron sheets are commonly used in construction, automotive, and manufacturing indust...read more

The Swedish standard for blast finish includes several grades.

• The Swedish standard for blast finish categorizes the finish into different grades based on the level of surface roughness.

• The grades range from Sa 1 to Sa 3, with Sa 1 being the least rough and Sa 3 being the roughest.

• Sa 1 is a light blast cleaning, suitable for surfaces that will be painted or coated.

• Sa 2 is a thorough blast cleaning, suitable for surfaces...read more

The air pressure required for sand blasting depends on various factors such as the type of surface being blasted, the type of abrasive material used, and the desired level of surface preparation.

• The air pressure for sand blasting typically ranges from 40 to 120 pounds per square inch (psi).

• For delicate surfaces or light cleaning, lower air pressure around 40-60 psi may be sufficient.

• For heavy-duty cleaning or removal o...read more

There are several types of sandblasting nozzles used for different purposes.

• There are generally four types of sandblasting nozzles: straight bore, venturi, angle, and wide throat.

• Straight bore nozzles are the most common and provide a concentrated stream of abrasive material.

• Venturi nozzles have a wider entry and narrow exit, creating a vacuum effect to increase abrasive velocity.

• Angle nozzles are used for hard-to-reac...read more

Electromechanical relays are commonly used in transformers for protection and control purposes.

• Electromechanical relays are commonly used in transformer protection schemes to detect faults and isolate the transformer from the system.

• Different types of relays used in transformers include overcurrent relays, differential relays, and distance relays.

• Solid-state relays are also gaining popularity due to their faster respon...read more

PLC stands for Programmable Logic Controller, which is a digital computer used for automation of electromechanical processes.

• PLC is used to control machinery in manufacturing processes.

• It uses a programmable memory to store instructions and specific functions.

• PLCs are commonly used in industries like automotive, food processing, and packaging.

• They can be programmed using ladder logic, function block diagrams, or struct...read more

Transformer rating in kVA is used instead of kW due to the presence of reactive power.

• kVA takes into account both active power (kW) and reactive power, providing a more accurate representation of the transformer's capacity.

• Reactive power is necessary for the magnetic field in transformers and does not perform useful work like active power.

• Using kVA allows for better sizing and selection of transformers to handle both a...read more