Hvac Engineer
40+ Hvac Engineer Interview Questions and Answers
Q1. What are the various Guage of ducting and which size we using which Guage
The gauge of ducting refers to its thickness and is determined based on the size and application of the duct.
The gauge of ducting ranges from 10 to 30, with lower numbers indicating thicker ducts.
The size of the duct determines the gauge to be used. Larger ducts generally require thicker gauges for structural integrity.
For example, a small residential HVAC system may use 24-gauge ducts, while a large commercial system may require 16-gauge ducts.
The gauge of ducting affects it...read more
Q2. what is quality circle method for problems solving technic
Quality circle method is a problem-solving technique that involves a group of employees working together to identify, analyze, and solve work-related issues.
Involves a group of employees working together
Focuses on identifying, analyzing, and solving work-related issues
Encourages employee participation and collaboration
Uses brainstorming sessions and data analysis to come up with solutions
Promotes continuous improvement and employee empowerment
Hvac Engineer Interview Questions and Answers for Freshers
Q3. As per guide line's revit and nut and bolt sizes in angle frame
The question is asking about the guidelines for Revit and nut and bolt sizes in angle frame for HVAC engineering.
Revit is a software used for building information modeling (BIM) in HVAC engineering.
Guidelines for Revit include standards for modeling, annotation, and documentation.
Nut and bolt sizes in angle frame refer to the specific dimensions and types of fasteners used in constructing angle frames for HVAC systems.
These sizes may vary depending on the load requirements, m...read more
Q4. Which type of filters using in ahu and plenum
Different types of filters can be used in AHUs and plenums depending on the specific requirements.
Fiberglass filters are commonly used in residential and commercial buildings.
Pleated filters have a larger surface area and can capture smaller particles.
HEPA filters are highly efficient and can capture particles as small as 0.3 microns.
Activated carbon filters can remove odors and chemicals from the air.
Electrostatic filters use an electric charge to attract and capture particl...read more
Q5. What is the in filtration and ex filtration
Infiltration and exfiltration are terms used in HVAC engineering to describe the movement of air into and out of a building.
Infiltration refers to the unintentional or uncontrolled flow of outdoor air into a building through cracks, gaps, or openings in the building envelope.
Exfiltration, on the other hand, is the opposite of infiltration and refers to the unintentional or uncontrolled flow of indoor air out of a building.
Both infiltration and exfiltration can have a signific...read more
Q6. What is this sanitizer bottle? Is it a Tool or a Machine?
The sanitizer bottle is a tool.
A tool is a device used to perform a specific task.
The sanitizer bottle is used to dispense sanitizer.
It does not have any moving parts or complex mechanisms.
It is a simple tool that can be operated by hand.
Share interview questions and help millions of jobseekers 🌟
Q7. What is the efficiency of h13 and h14
H13 and H14 are high-efficiency particulate air (HEPA) filters used in HVAC systems.
H13 filters can capture 99.95% of particles as small as 0.3 microns.
H14 filters can capture 99.995% of particles as small as 0.3 microns.
Both filters are commonly used in hospitals, cleanrooms, and other environments where air quality is critical.
The efficiency of these filters can vary depending on factors such as airflow rate and particle size distribution.
Q8. How much micron to be reached while vacuuming HVAC system before commissioning
The vacuuming process for an HVAC system should reach a level of 500 microns before commissioning.
The recommended micron level for vacuuming an HVAC system before commissioning is 500 microns.
This level ensures that the system is free of contaminants and moisture, which can affect its performance.
Using a high-quality vacuum pump and proper techniques is essential to achieve this level of vacuum.
Regularly checking the micron level during the vacuuming process is important to e...read more
Hvac Engineer Jobs
Q9. Types of chiller types of AHU and also types of maintenance
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
Q10. What is Refrigerator &Refrigeration
Refrigeration is the process of removing heat from a space to lower its temperature, commonly used in refrigerators to preserve food.
Refrigeration involves the transfer of heat from a low-temperature space to a high-temperature space.
Refrigerators use refrigeration to keep food cold and prevent spoilage.
Common refrigerants used in refrigeration systems include Freon, ammonia, and carbon dioxide.
Q11. which part in Refrigeration cycle
The part in the refrigeration cycle responsible for absorbing heat from the indoor air is the evaporator coil.
Evaporator coil is located inside the indoor unit of the HVAC system.
It contains refrigerant that evaporates as it absorbs heat from the indoor air.
The evaporator coil is where the cooling process begins in the refrigeration cycle.
Once the refrigerant absorbs heat, it is sent to the compressor for further processing.
Q12. What u know abot HVAC in Pharma ?
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
Q13. How to maintain differential pressure of area
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
Q14. What is chillers and its component
Chillers are machines that remove heat from a liquid via a vapor-compression or absorption refrigeration cycle.
Components include compressor, condenser, evaporator, expansion valve, and refrigerant.
Types of chillers include air-cooled, water-cooled, and absorption chillers.
Chillers are commonly used in HVAC systems for cooling large buildings or industrial processes.
Q15. Hvac validation Hvac diffrential process monitoring Designing of hvac
Hvac validation involves ensuring that the heating, ventilation, and air conditioning systems meet required standards and specifications.
Hvac validation involves testing and verifying that the system operates correctly and efficiently.
Hvac differential process monitoring involves monitoring temperature, pressure, and airflow differentials to ensure proper functioning.
Designing of Hvac systems involves creating layouts, selecting equipment, and determining optimal placement fo...read more
Q16. what is type of chiller
A type of chiller commonly used in HVAC systems is the centrifugal chiller.
Centrifugal chillers use the principle of centrifugal force to cool water or air.
They are typically used in large commercial buildings or industrial facilities.
Examples of centrifugal chillers include Trane CenTraVac and Carrier AquaEdge.
Q17. All types of HVAC equipment handled
Yes, I have experience in handling all types of HVAC equipment.
I have experience in handling air conditioning units, boilers, chillers, heat pumps, and ventilation systems.
I am familiar with both commercial and residential HVAC systems.
I have worked with various brands and models of HVAC equipment.
I am knowledgeable in troubleshooting and repairing HVAC equipment.
I am up-to-date with the latest HVAC technologies and industry standards.
Q18. How to check working of Fire damper?
Fire damper can be checked by visual inspection, drop test, and airflow test.
Inspect for any visible damage or obstruction
Perform a drop test to ensure the damper closes properly
Conduct an airflow test to verify the damper's ability to restrict airflow
Check the damper's label for installation date and maintenance schedule
Record the results of the inspection and tests in a logbook
Q19. what is Refrigeration cycle
Refrigeration cycle is a process in which a refrigerant absorbs heat from a low-temperature area and releases it in a high-temperature area.
Refrigerant absorbs heat from the evaporator coil and evaporates into a gas
The compressor then compresses the gas, raising its temperature and pressure
The hot gas flows through the condenser coil, releasing heat and condensing back into a liquid
The liquid refrigerant passes through the expansion valve, where it expands and cools down befo...read more
Q20. Manpower handling capacity on site ?
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
Q21. Energy Efficiency Ratio, Integrated Part Load Value of Chiller.
Energy Efficiency Ratio (EER) and Integrated Part Load Value (IPLV) are important metrics used to measure the efficiency of chillers.
EER is the ratio of cooling output to the electrical power input of a chiller at a specific operating condition.
IPLV is an average efficiency value calculated at various part load conditions, representing the chiller's performance over a typical operating cycle.
Both EER and IPLV help in comparing the energy efficiency of different chillers and s...read more
Q22. How to control relative humidity
Relative humidity can be controlled by using dehumidifiers, ventilation systems, air conditioning, and proper insulation.
Use dehumidifiers to remove excess moisture from the air
Implement ventilation systems to circulate air and prevent moisture buildup
Utilize air conditioning to cool the air and reduce humidity levels
Ensure proper insulation to prevent condensation and moisture infiltration
Q23. how select pumo
Selecting a pump involves considering factors like flow rate, head pressure, efficiency, and system requirements.
Determine the required flow rate for the system
Calculate the head pressure needed to overcome friction and elevation changes
Consider the efficiency of the pump to minimize energy consumption
Select a pump that meets the system requirements and is compatible with the fluid being pumped
Q24. What is comoressor
A compressor is a mechanical device that increases the pressure of a gas by reducing its volume.
Compressors are commonly used in HVAC systems to compress refrigerant gases.
There are different types of compressors such as reciprocating, rotary, and scroll compressors.
Compressors play a crucial role in the cooling process by circulating refrigerant through the system.
The compressor is often referred to as the 'heart' of an HVAC system.
Q25. what iscentrifuse
Centrifuse is not a recognized term in the HVAC engineering field.
Centrifuse is not a commonly used term in HVAC engineering.
It is possible that the interviewer may have misspoken or meant to ask about centrifuge, a device used for separating fluids based on density.
If unsure, it is best to ask for clarification from the interviewer.
Q26. How to perform HVAC qualification.
HVAC qualification involves testing and verifying the performance of HVAC systems to ensure they meet specified requirements.
Develop a qualification plan outlining the tests and procedures to be performed.
Conduct tests to verify the performance of HVAC components such as air handlers, chillers, and controls.
Document test results and compare them against acceptance criteria.
Perform functional testing to ensure the HVAC system operates as intended.
Verify that the HVAC system me...read more
Q27. Media of HEPA filter and it's make
HEPA filters are made of a dense mat of randomly arranged fibers, typically fiberglass, and are used to trap small particles.
HEPA filters are typically made of fiberglass fibers
The fibers are arranged randomly to create a dense mat
HEPA filters are designed to trap small particles such as dust, pollen, and mold spores
Q28. How to work Thermal Expansion Valve
A thermal expansion valve is a device used in HVAC systems to control the flow of refrigerant and regulate the temperature.
The thermal expansion valve is located between the condenser and the evaporator in the refrigeration cycle.
It works by sensing the temperature and pressure of the refrigerant and adjusting the flow rate accordingly.
When the temperature and pressure are low, the valve restricts the flow of refrigerant, allowing it to absorb more heat and increase in temper...read more
Q29. Type pipes used in chilled water distribution
Common types of pipes used in chilled water distribution include copper, steel, and PVC.
Copper pipes are often used for their corrosion resistance and heat transfer properties.
Steel pipes are durable and can withstand high pressure, but may be prone to corrosion.
PVC pipes are lightweight, easy to install, and resistant to corrosion, but may not be suitable for high temperature applications.
Q30. Calculation of ducting
Calculation of ducting in HVAC engineering involves determining the size, shape, and layout of ducts to ensure proper airflow and ventilation.
Calculate the required airflow rate based on the heating or cooling load of the space
Determine the friction loss in the ducts using the Darcy-Weisbach equation
Select the appropriate duct size based on the desired air velocity and pressure drop
Consider factors such as duct material, insulation, and fittings
Design the duct layout to minim...read more
Q31. Explain briefly about BMS and EMS
BMS stands for Building Management System, which controls and monitors building functions like HVAC, lighting, security. EMS stands for Energy Management System, which focuses on energy efficiency and conservation.
BMS controls and monitors various building functions such as HVAC, lighting, security, and fire systems.
EMS focuses on energy efficiency and conservation by optimizing energy usage within a building.
BMS helps in maintaining a comfortable and safe environment for occ...read more
Q32. What is Noise filter pcb
A noise filter PCB is a printed circuit board that is designed to reduce or eliminate electrical noise in electronic devices.
Noise filter PCBs are commonly used in HVAC systems to reduce electrical interference and improve the overall performance of the system.
These PCBs typically include components such as capacitors, inductors, and resistors that help filter out unwanted noise signals.
The noise filter PCB works by attenuating high-frequency noise and preventing it from affe...read more
Q33. HVAC design parameters
HVAC design parameters include load calculations, equipment selection, duct sizing, and ventilation rates.
Load calculations determine the heating and cooling requirements of a building.
Equipment selection involves choosing the appropriate HVAC system for the building's needs.
Duct sizing ensures proper air flow and distribution throughout the building.
Ventilation rates determine the amount of fresh air needed for indoor air quality.
Other parameters include zoning, insulation, ...read more
Q34. What is centrifugal compressor
A centrifugal compressor is a type of dynamic compressor that uses a rotating impeller to increase the pressure and flow of a gas.
It works by converting kinetic energy into potential energy.
It is commonly used in HVAC systems, gas turbines, and refrigeration systems.
It is more efficient than positive displacement compressors for high flow rates and low pressure differentials.
It can be single-stage or multi-stage, depending on the required pressure ratio.
Examples include the I...read more
Q35. What is latent heat..?
Latent heat is the heat absorbed or released during a phase change without a change in temperature.
Latent heat is the energy required to change the state of a substance without changing its temperature.
It is the heat absorbed or released when a substance changes from one state to another, such as from solid to liquid or liquid to gas.
During phase changes, the energy is used to break or form intermolecular bonds.
Examples include the heat absorbed when ice melts into water or t...read more
Q36. what is the basic of hvac
HVAC stands for heating, ventilation, and air conditioning. It is the technology of indoor and vehicular environmental comfort.
HVAC systems control temperature, humidity, and air quality in buildings.
Heating systems can include furnaces, boilers, and heat pumps.
Ventilation systems provide fresh air and remove stale air.
Air conditioning systems cool and dehumidify indoor air.
HVAC engineers design, install, and maintain HVAC systems to ensure comfort and efficiency.
Examples of ...read more
Q37. Hvac Installation and responsibility ?
HVAC installation involves designing, installing, and maintaining heating, ventilation, and air conditioning systems in buildings.
Designing HVAC systems based on building requirements
Installing HVAC equipment such as furnaces, air conditioners, and ductwork
Ensuring proper functioning of HVAC systems through regular maintenance and repairs
Following safety protocols and regulations during installation
Collaborating with other professionals like architects and electricians
Q38. Hvac site engineer responsible?
HVAC site engineer is responsible for overseeing installation, maintenance, and repair of heating, ventilation, and air conditioning systems at a construction site.
Overseeing installation of HVAC systems at construction sites
Ensuring proper maintenance and repair of HVAC systems
Coordinating with contractors and other trades on site
Troubleshooting HVAC system issues
Ensuring compliance with safety regulations and building codes
Q39. Cooling tower discharge pressure
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
Q40. Detail of periodic qualification
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
Q41. What is Sensible heat
Sensible heat is the heat that can be felt and measured by a thermometer.
Sensible heat is the heat that causes a change in temperature of a substance without changing its state.
It is the heat that can be sensed or measured by a thermometer.
Examples of sensible heat include the heat from a stove burner, the warmth of the sun, and the heat from a radiator.
Sensible heat is important in HVAC systems as it is used to calculate the cooling load of a building.
It is also used in the ...read more
Q42. HVAC site execution stages
HVAC site execution stages involve planning, installation, testing, and commissioning of HVAC systems.
Planning stage involves designing the HVAC system, selecting equipment, and determining the layout.
Installation stage involves actual installation of the HVAC system components such as ductwork, piping, and equipment.
Testing stage involves checking the system for leaks, pressure, and temperature control.
Commissioning stage involves verifying that the HVAC system is operating ...read more
Q43. What ia refrigeration system
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
Q44. What is HVAC system
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
Q45. Hvac execution experience only..
I have 5 years of experience in executing HVAC projects, including installation, maintenance, and troubleshooting.
Experience in installing HVAC systems according to design specifications
Knowledge of HVAC equipment maintenance and repair
Ability to troubleshoot and resolve HVAC system issues
Familiarity with HVAC codes and regulations
Experience working with various HVAC systems such as split systems, VRF, and chillers
Q46. Working process of chiller
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
Q47. Hvac working principle
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
Q48. Site monitoring experience
I have extensive site monitoring experience in HVAC engineering, including overseeing installations, conducting inspections, and troubleshooting issues.
Managed site visits to ensure proper installation of HVAC systems
Conducted regular inspections to identify potential issues and ensure compliance with regulations
Troubleshooted and resolved HVAC system malfunctions on site
Collaborated with contractors and other team members to coordinate site activities
Implemented preventive m...read more
Q49. Types of maintenance
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.
Interview Questions of Similar Designations
Interview experiences of popular companies
Calculate your in-hand salary
Confused about how your in-hand salary is calculated? Enter your annual salary (CTC) and get your in-hand salary
Reviews
Interviews
Salaries
Users/Month