10+ Hvac Mechanical Engineer Interview Questions and Answers

HVAC stands for Heating, Ventilation, and Air Conditioning. AHV refers to Air Handling Unit. VAV stands for Variable Air Volume.

• HVAC is a system that provides heating, cooling, and ventilation to a building or space.

• AHU is a device used to circulate and condition air as part of an HVAC system.

• VAV is a type of HVAC system that allows for variable airflow and temperature control in different zones of a building.

• AHV is not a commonly used acronym in the HVAC industry.

BMS commissioning involves testing and verifying the functionality of building automation systems. Troubleshooting is necessary to identify and resolve any issues.

• BMS commissioning involves verifying the functionality of HVAC systems, lighting, and other building automation systems.

• Testing is done to ensure that the systems are working as intended and meeting the design specifications.

• Troubleshooting is necessary to identify and resolve any issues that arise during commission...read more

Compressor lubricants are essential for the proper functioning of HVAC systems. Their boiling point determines their effectiveness.

• Compressor lubricants are used to reduce friction and wear between moving parts in HVAC systems.

• The boiling point of a lubricant determines its ability to withstand high temperatures without breaking down.

• Lubricants with higher boiling points are more effective in high-temperature environments.

• Synthetic lubricants generally have higher boiling poi...read more

The refrigeration cycle is a process that removes heat from a space and transfers it to the surroundings.

• The cycle consists of four main components: compressor, condenser, expansion valve, and evaporator.

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

• The high-pressure gas then flows into the condenser, where it releases heat and condenses into a high-pressure liquid.

• The liquid refrigerant passes through the expansion valve, which reduces i...read more

Major problems in FCUs and AHUs include clogged filters, faulty motors, and leaky ducts.

• Clogged filters reduce airflow and decrease efficiency.

• Faulty motors can cause the unit to stop working or make loud noises.

• Leaky ducts can lead to energy waste and poor indoor air quality.

• Regular maintenance and inspections can prevent these issues.

• Proper installation and sizing of the unit is also important.

• Examples of common FCUs and AHUs include rooftop units, air handling units, and f...read more

AHU and FCU valve packages diagrams are used to control the flow of air and water in HVAC systems.

• AHU and FCU valve packages are used to regulate the flow of air and water in HVAC systems

• These diagrams show the location and type of valves used in the system

• Valve packages can include control valves, isolation valves, and balancing valves

• AHU valve packages may also include dampers for air flow control

• FCU valve packages may include thermostatic valves for temperature control

• Prop...read more

Dry bulb temperature is the temperature of air measured by a thermometer freely exposed to the air.

• Dry bulb temperature is the most commonly used temperature measurement in HVAC engineering.

• It represents the actual temperature of the air.

• It is measured using a thermometer that is not affected by moisture or humidity.

• Dry bulb temperature is used to determine the heating and cooling loads in HVAC systems.

• For example, if the dry bulb temperature is 25 degrees Celsius, it means t...read more

HVAC stands for Heating, Ventilation, and Air Conditioning.

• HVAC is a system used to control the temperature, humidity, and air quality in buildings.

• It includes equipment such as furnaces, air conditioners, and ventilation systems.

• HVAC systems are essential for maintaining comfortable and healthy indoor environments.

• Examples of HVAC applications include residential homes, commercial buildings, and industrial facilities.

A pump suction and discharge diagram shows the flow of fluid through a pump system.

• The suction side of the pump is where the fluid enters the pump.

• The discharge side of the pump is where the fluid exits the pump.

• The diagram typically includes valves, pipes, and other components of the pump system.

• The diagram may also show the direction of flow and the pressure at various points in the system.

FCU connection diagram shows the connections between the fan coil unit and other components in the HVAC system.

• FCU connection diagram typically includes the connections for power supply, control signals, and refrigerant lines.

• The diagram may also show the connections for ductwork, sensors, and valves.

• Examples of components that may be connected to the FCU include the air handling unit, chiller, and thermostat.

• The FCU connection diagram is important for ensuring proper install...read more