Capgemini Interview Questions and Answers

There are mainly two types of pumps used in HVAC systems: centrifugal pumps and positive displacement pumps.

• Centrifugal pumps are commonly used in HVAC systems for circulating water or other fluids. They are efficient and have a simple design.

• Positive displacement pumps are used for applications where a specific flow rate is required, such as in hydronic heating systems.

• Other types of pumps used in HVAC systems include axial flow pumps, mixed flow pumps, and regenerative turb...read more

PPM stands for Planned Preventative Maintenance. It should be done every 3-6 months for chillers, AHUs, pumps, and other equipment.

• PPM is a proactive approach to maintenance to prevent breakdowns and prolong equipment life.

• Chillers, AHUs, pumps, and other critical equipment should undergo PPM every 3-6 months.

• Regular PPM helps in identifying potential issues early and ensures optimal performance of the equipment.

• PPM involves tasks like cleaning, lubricating, inspecting, and t...read more

When the pump motor is heated, it can lead to decreased efficiency, increased wear and tear, and potential damage to the motor.

• Decreased efficiency: Heat can cause the motor to work harder, leading to decreased efficiency in pumping water.

• Increased wear and tear: Excessive heat can accelerate the wear and tear of the motor components, reducing its lifespan.

• Potential damage: If the motor overheats, it can lead to permanent damage such as burnt windings or insulation failure.

• Lo...read more

A chemical dosing system in a chiller is used to introduce specific chemicals into the water to prevent scaling, corrosion, and biological growth.

• It helps maintain the efficiency and longevity of the chiller system.

• Chemicals like corrosion inhibitors, biocides, and scale inhibitors are commonly used.

• The dosing system carefully controls the amount of chemicals added to the water based on the chiller's requirements.

Check the pump motor temperature by touching the motor housing.

• Touch the motor housing with your hand to feel for excessive heat

• Use a temperature gun to measure the motor temperature

• Check for any unusual smells or sounds coming from the motor

• Monitor the motor's temperature gauge if available