Senior Hvac Engineer

10+ Senior Hvac Engineer Interview Questions and Answers

Updated 30 Jun 2025
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1d ago

Q. What are the guidelines for designing a car park ventilation and pressurization system in accordance with the National Building Code (NBC) and the National Fire Protection Association (NFPA)?

Ans.

Guidelines for car park ventilation and pressurization systems per NBC and NFPA ensure safety and efficiency.

  • Ensure adequate air exchange rates to dilute vehicle emissions, typically 0.5 to 1.0 air changes per hour.

  • Implement smoke control systems to manage smoke during a fire, using mechanical or natural ventilation methods.

  • Design pressurization systems to prevent smoke infiltration into adjacent areas, maintaining a positive pressure differential.

  • Incorporate emergency ventil...read more

3d ago

Q. In winter with negative temperatures, how can water be used to avoid freezing?

Ans.

Water can prevent freezing in winter by using methods like insulation, circulation, and additives to lower freezing points.

  • Insulation: Insulating pipes and tanks helps retain heat, preventing water from reaching freezing temperatures.

  • Circulation: Keeping water moving through pipes can prevent stagnation and freezing; for example, running a trickle of water can help.

  • Heat Trace Cables: Installing heat trace cables along pipes provides direct heat to prevent freezing in extremel...read more

6d ago

Q. What are the ASHRAE guidelines for designing HVAC systems?

Ans.

ASHRAE guidelines provide standards for HVAC system design, ensuring efficiency, comfort, and safety in various environments.

  • ASHRAE Standard 62.1: Ventilation for Acceptable Indoor Air Quality - outlines minimum ventilation rates for different building types.

  • ASHRAE Standard 90.1: Energy Standard for Buildings - sets energy efficiency requirements for HVAC systems to reduce energy consumption.

  • ASHRAE Guideline 36: High-Performance Sequences of Operation for HVAC Systems - provi...read more

5d ago

Q. Prototyping nd physical build testing of HVAC system

Ans.

Prototyping and physical build testing of HVAC system involves creating a working model and testing it in real-world conditions.

  • Create a prototype of the HVAC system

  • Test the prototype in real-world conditions

  • Make necessary adjustments based on test results

  • Repeat the process until the system meets all requirements

  • Examples of physical build testing include measuring airflow, temperature, and humidity levels

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Q. Overhauling of Screw and Centrifugal compressor

Ans.

Overhauling screw and centrifugal compressors involves disassembly, inspection, and reassembly to restore performance and efficiency.

  • Disassembly: Carefully remove the compressor from its installation, documenting the process for reassembly.

  • Inspection: Check for wear and damage on components like rotors, bearings, and seals; replace any faulty parts.

  • Cleaning: Thoroughly clean all components to remove oil, dirt, and debris that can affect performance.

  • Reassembly: Follow manufact...read more

Asked in Worley

2d ago

Q. Explain the process of HVAC heat load calculation.

Ans.

HVAC heat load calculation determines the heating and cooling requirements for a space to maintain comfort.

  • Identify the space dimensions: Measure length, width, and height of the area.

  • Calculate heat gain/loss: Consider factors like insulation, windows, and occupancy.

  • Use the Manual J method: A widely accepted calculation method for residential loads.

  • Account for equipment: Include heat generated by appliances and lighting.

  • Consider climate: Adjust calculations based on local wea...read more

Senior Hvac Engineer Jobs

Aasnaa Engineers logo
Senior Hvac Engineer 10-20 years
Aasnaa Engineers
4.4
₹ 7 L/yr - ₹ 14 L/yr
Hyderabad / Secunderabad

Q. How do you handle projects?

Ans.

Handling projects requires effective planning, communication, and management skills.

  • Create a detailed project plan with clear timelines and milestones

  • Communicate regularly with team members and stakeholders to ensure everyone is on the same page

  • Identify and mitigate potential risks and issues before they become major problems

  • Monitor progress and adjust plans as needed

  • Ensure all project deliverables meet quality standards and are delivered on time and within budget

4d ago

Q. How does a cooling system work?

Ans.

To work any cooling system, understand the components, follow manufacturer's instructions, perform regular maintenance, and monitor performance.

  • Understand the components of the cooling system such as the compressor, condenser, evaporator, and expansion valve

  • Follow manufacturer's instructions for installation, operation, and maintenance

  • Perform regular maintenance tasks like cleaning filters, checking refrigerant levels, and inspecting for leaks

  • Monitor the performance of the co...read more

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2d ago

Q. How much experience do you have in HVAC?

Ans.

I have 10 years of experience in HVAC engineering, specializing in designing and implementing heating, ventilation, and air conditioning systems for commercial buildings.

  • Designed and implemented HVAC systems for various commercial buildings, ensuring optimal performance and energy efficiency.

  • Performed load calculations to determine the heating and cooling requirements of buildings.

  • Selected appropriate HVAC equipment and components based on project specifications and budget co...read more

Asked in Dabur

3d ago

Q. What is a central plant?

Ans.

Central plant is a facility that houses large equipment to provide heating, cooling, and power to a building or multiple buildings.

  • Central plant typically includes boilers, chillers, pumps, and generators.

  • It distributes heating and cooling through a network of pipes to different areas of a building.

  • Central plants are commonly found in large commercial buildings, hospitals, universities, and industrial facilities.

2d ago

Q. What do you know about HVAC systems?

Ans.

HVAC stands for heating, ventilation, and air conditioning. It is a system used to control the temperature, humidity, and air quality in buildings.

  • HVAC systems are used in residential, commercial, and industrial buildings to provide comfort and maintain indoor air quality.

  • They consist of heating units, ventilation systems, and air conditioning units that work together to regulate temperature and air flow.

  • HVAC engineers design, install, and maintain these systems to ensure the...read more

4d ago

Q. How do you handle HVAC systems?

Ans.

HVAC refers to heating, ventilation, and air conditioning systems that control indoor temperature, air quality, and humidity.

  • Design and install HVAC systems based on building requirements

  • Perform regular maintenance and inspections to ensure optimal performance

  • Troubleshoot and repair HVAC equipment and components

  • Monitor energy usage and implement energy-efficient practices

  • Ensure compliance with safety and environmental regulations

  • Collaborate with architects, contractors, and o...read more

Q. What is the working principle of a Centrifugal Chiller?

Ans.

Centrifugal chillers use a rotating impeller to compress refrigerant, facilitating heat exchange and cooling in HVAC systems.

  • Centrifugal chillers operate on the principle of vapor compression.

  • They utilize a rotating impeller to increase the pressure of the refrigerant.

  • The refrigerant absorbs heat from the building and evaporates in the evaporator.

  • The compressor then compresses the vapor refrigerant, raising its temperature and pressure.

  • The high-pressure vapor releases heat in...read more

4d ago

Q. What is a chiller?

Ans.

A chiller is a machine that removes heat from a liquid via a vapor-compression or absorption refrigeration cycle.

  • Chillers are commonly used in HVAC systems to cool buildings or industrial processes.

  • They work by transferring heat from the liquid being chilled to a different medium, such as air or water.

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

  • Examples of chillers include centrifugal chillers, screw chillers, and absorption chillers.

Q. Explain the working principle of a VFD.

Ans.

VFDs control motor speed by varying frequency and voltage, enhancing efficiency and performance in HVAC systems.

  • VFD stands for Variable Frequency Drive, which adjusts motor speed by changing the frequency of the electrical supply.

  • By controlling the frequency, VFDs allow for precise speed control, reducing energy consumption in HVAC systems.

  • For example, in a fan application, a VFD can lower the fan speed during low demand, saving energy.

  • VFDs also help in reducing mechanical st...read more

Asked in Dabur

1d ago

Q. HVAC Full form

Ans.

HVAC stands for Heating, Ventilation, and Air Conditioning.

  • HVAC systems are responsible for controlling the temperature, humidity, and air quality in buildings.

  • Examples of HVAC equipment include furnaces, air conditioners, heat pumps, and ventilation systems.

  • HVAC engineers design, install, and maintain these systems to ensure comfort and safety for occupants.

  • Efficient HVAC systems can also help reduce energy consumption and lower utility costs.

Asked in Tata Motors

3d ago

Q. What is the full form of BMS?

Ans.

Building Management System

  • BMS stands for Building Management System

  • It is a computer-based control system installed in buildings to monitor and manage mechanical and electrical equipment such as HVAC, lighting, security systems, etc.

  • BMS helps in optimizing energy usage, improving comfort levels, and enhancing overall building efficiency

  • Examples of BMS software include Honeywell EBI, Siemens Desigo, Johnson Controls Metasys

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