Hvac Engineer

10+ Hvac Engineer Interview Questions and Answers for Freshers

Updated 15 Jul 2025
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Q. Types of chiller types of AHU and also types of maintenance

Ans.

Chiller types include air-cooled, water-cooled, and absorption chillers. AHU types include single-zone, multi-zone, and variable air volume units. Maintenance includes preventive, predictive, and reactive maintenance.

  • Chiller types: air-cooled, water-cooled, absorption

  • AHU types: single-zone, multi-zone, variable air volume

  • Maintenance types: preventive, predictive, reactive

Q. What do you know about HVAC systems in the pharmaceutical industry?

Ans.

HVAC in Pharma refers to the heating, ventilation, and air conditioning systems used in pharmaceutical facilities.

  • HVAC systems in pharma are designed to maintain specific temperature, humidity, and air quality levels to ensure product integrity and safety.

  • Cleanrooms in pharma require specialized HVAC systems to control particulate matter and prevent contamination.

  • Pharmaceutical HVAC systems often incorporate features like HEPA filters, airlocks, and pressure differentials.

  • Tem...read more

Q. How do you maintain the differential pressure of an area?

Ans.

Maintain differential pressure by adjusting airflow, sealing leaks, and monitoring equipment.

  • Adjust airflow using dampers or variable frequency drives to balance pressure

  • Seal leaks in ductwork or building envelope to prevent pressure loss

  • Monitor equipment regularly to ensure proper functioning and make adjustments as needed

Q. What is your manpower handling capacity on site?

Ans.

The manpower handling capacity on site depends on various factors such as project size, complexity, and available resources.

  • The number of workers required for a project depends on the size and complexity of the project.

  • The availability of resources such as equipment and materials also affects the manpower handling capacity.

  • Effective communication and coordination among team members can improve the efficiency of manpower handling.

  • Proper planning and scheduling can help in opti...read more

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Q. Detail of periodic qualification

Ans.

Periodic qualification involves obtaining certifications and licenses to ensure competency and compliance with industry standards.

  • HVAC engineers should regularly update their certifications and licenses to stay current with industry regulations.

  • Continuing education courses can help HVAC engineers stay up-to-date on the latest technologies and best practices.

  • Some examples of certifications for HVAC engineers include EPA 608 certification, NATE certification, and state-specific...read more

Q. Cooling tower discharge pressure

Ans.

Cooling tower discharge pressure is the pressure at which water is discharged from the cooling tower.

  • Cooling tower discharge pressure is typically measured in pounds per square inch (psi) or inches of water column (in. WC).

  • The discharge pressure is influenced by factors such as the flow rate of water, the height of the cooling tower, and the design of the tower.

  • Maintaining the correct discharge pressure is important for the efficient operation of the cooling tower and the ove...read more

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Asked in VBL Group

5d ago

Q. What is a refrigeration system?

Ans.

A refrigeration system is a mechanical system that removes heat from a space to lower its temperature.

  • Consists of components such as compressors, condensers, evaporators, and expansion valves

  • Uses refrigerants to transfer heat from one area to another

  • Commonly used in air conditioning units, refrigerators, and freezers

Asked in Beacon Hotel

3d ago

Q. What is an HVAC system?

Ans.

HVAC system stands for Heating, Ventilation, and Air Conditioning system, which is used to control the temperature, humidity, and air quality in a building.

  • HVAC systems regulate indoor air quality by providing ventilation, maintaining temperature, and controlling humidity levels.

  • They consist of components such as furnaces, air conditioners, heat pumps, ductwork, thermostats, and air filters.

  • Examples of HVAC systems include central heating and cooling systems, split systems, a...read more

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Q. What is the working process of a chiller?

Ans.

Chiller is a device that removes heat from a liquid via a vapor-compression or absorption refrigeration cycle.

  • Chiller absorbs heat from a process water stream and transfers it to a refrigerant.

  • The refrigerant then carries the heat to the condenser where it is released.

  • The chilled water is circulated through the building to cool the air or equipment.

  • Chillers can be air-cooled, water-cooled, or evaporatively cooled.

  • Common types of chillers include centrifugal, screw, and absorp...read more

6d ago

Q. What are the working principles of HVAC systems?

Ans.

HVAC systems work by transferring heat from one area to another using refrigerant to cool or heat the air.

  • HVAC systems use refrigerant to absorb and release heat

  • Air is circulated through ducts to distribute the cooled or heated air

  • Thermostats control the temperature settings of the HVAC system

Asked in MRF Tyres

1d ago

Q. Types of maintenance

Ans.

Types of maintenance include preventive, predictive, corrective, and proactive maintenance.

  • Preventive maintenance involves regular inspections and tasks to prevent breakdowns.

  • Predictive maintenance uses data and analytics to predict when equipment will fail.

  • Corrective maintenance is performed after a failure occurs to restore functionality.

  • Proactive maintenance involves identifying and fixing issues before they cause downtime.

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