Cognizant Interview Questions and Answers

BFP section and discharge line can be identified by looking at the pipe size, location, and direction of flow.

• Check the pipe size - BFP section typically has larger diameter pipes compared to discharge lines.

• Look at the location - BFP section is usually located near the pump or boiler room.

• Check the direction of flow - BFP section will have pipes leading towards the pump or boiler.

• Consider any labels or markings on the pipes indicating BFP or discharge line.

• Consult the piping...read more

Safety valves with higher pressure to blow are typically set at 10-15% above the operating pressure.

• Safety valves with higher pressure to blow are usually set at 10-15% above the operating pressure to ensure they open only in case of overpressure.

• For example, if the operating pressure is 100 psi, the safety valve may be set to blow at 110-115 psi.

• This ensures that the safety valve only opens when the system is truly at risk of overpressure, preventing unnecessary releases.

Typically, a boiler will have multiple safety valves installed for redundancy and safety purposes.

• Boilers usually have at least two safety valves for redundancy in case one fails.

• The number of safety valves can vary depending on the size and type of boiler.

• Larger industrial boilers may have multiple safety valves to ensure proper pressure relief.

• Some boilers may have three or more safety valves for added safety measures.

The maximum temperature of water in a deareator tank is typically around 105-110 degrees Celsius.

• The maximum temperature is important for ensuring proper deaeration of water in the tank.

• Exceeding the maximum temperature can lead to damage to the tank and equipment.

• Regular monitoring and maintenance are necessary to ensure the temperature stays within the safe range.

Major losses in boiler refer to energy losses that occur during the operation of a boiler due to various factors.

• Major losses in boiler include radiation losses, convection losses, and exhaust gas losses.

• Radiation losses occur due to heat being lost through the boiler walls and surroundings.

• Convection losses happen when hot gases leave the boiler without transferring all their heat to the water.

• Exhaust gas losses occur when hot gases exit the boiler at a higher temperature th...read more

The calorific value of fuel is the amount of heat energy released per unit mass of fuel burned.

• Calorific value is typically measured in units like kilojoules per kilogram (kJ/kg) or British thermal units per pound (BTU/lb).

• Higher calorific value indicates more energy content in the fuel.

• Different fuels have different calorific values, for example, coal has a higher calorific value than wood.

• Calorific value is important in determining the efficiency of combustion processes and...read more