Interview Questions.

Question 1. What Is Local Comfort Cooling System?

Answer :

They can be incorporated, with heating, ventilation and air con furnished by way of a single gadget, as an example, air handling units related to ductwork, or they'll be a aggregate of separate systems, for instance mechanical air flow but with radiators for heating and neighborhood comfort cooling units.

Question 2. What Is Centralised Air System?

Answer :

The maximum common crucial cooling device is a split device, which incorporates an outside cupboard containing a condenser coil and compressor, and an indoor evaporator coil, typically established along side your furnace. Or air handler . The compressor pumps a chemical called refrigerant via the device.

Mechanical Engineering Interview Questions
Question three. What Is Constant Volume System?

Answer :

Constant Air Volume (CAV) is a sort of heating, ventilating, and air-conditioning (HVAC) system. In a easy CAV system, the deliver air drift fee is steady, however the supply air temperature is numerous to meet the thermal loads of a space. Most CAV systems are small, and serve a unmarried thermal region.

Question four. What Is Variable Air Volume System & Dual Duct System?

Answer :

Variable Air Volume (VAV) is a form of heating, ventilating, and/or air-conditioning (HVAC) gadget. Unlike steady air extent (CAV) systems, which supply a regular airflow at a variable temperature, VAV systems range the airflow at a regular temperature.

Question five. What Is Hydronic System Or Air-water System?

Answer :

Hydronic systems circulate warm water via warming baseboards, radiators and/or radiant tubing on your floors or ceilings. There are many benefits to heating your own home the use of a hydronic machine, whether it is for a new domestic or as a alternative heating device.

Air Conditioning and Refrigeration Interview Questions
Question 6. How Vapour Compression Cycle Works ?

Answer :

The Vapor-Compression Refrigeration Cycle is made out of 4 steps. ... The condenser is in contact with the hot reservoir of the refrigeration gadget. (The gas releases heat into the hot reservoir due to the outside work added to the fuel.) The refrigerant leaves as a high strain liquid.

Question 7. What Is Vapor Compression Cycle?

Answer :

Vapor-Compression Refrigeration or vapor-compression refrigeration device (VCRS), wherein the refrigerant undergoes segment adjustments, is one of the many refrigeration cycles and is the maximum extensively used technique for air-conditioning of homes and cars.

Plumbing Interview Questions
Question 8. Why Is A Compressor Used In Refrigeration?

Answer :

The compressor does precisely as its call says: it compresses the refrigerant. The compressor receives low stress gasoline from the evaporator and converts it to excessive stress fuel. As referred to earlier, because the fuel is compressed, the temperature rises. The warm refrigerant gasoline then flows to the condenser.

Question nine. What Is Auto Refrigeration?

Answer :

Auto-refrigeration is a system where an unintended and/or out of control phase trade of a hydrocarbon from a liquid country to a vapor takes place, resulting in a totally speedy chilling (refrigeration) of the liquid containing neighborhood gadget and/or piping.

Aircraft Maintenance Interview Questions
Question 10. How Does A Refrigerant Compressor Work?

Answer :

The compressor constricts the refrigerant vapor, elevating its stress, and pushes it into the coils on the out of doors of the fridge.
When the recent gasoline inside the coils meets the cooler air temperature of the kitchen, it becomes a liquid.
The refrigerant absorbs the heat in the refrigerator, cooling down the air.
Question eleven. Why Capacity Of Air Conditioner Is Measured In Tons?

Answer :

A 4 ton air conditioner is one that may get rid of forty eight,000 BTUs of warmth per hour from the residence. For most of the people, even though, 4 tons manner 8000 pounds. (A BTU is a British Thermal Unit, about the amount of heat you get from burning one kitchen healthy all of the manner down.)

Revit Interview Questions
Question 12. What Is The Meaning Of 1 Ton Of Ac?

Answer :

A ton, as used in the HVAC subject, is a term that describes how a lot warmth the AC unit can cast off from a domestic in a single hour. The size for warmth is the British thermal unit (BTU). One ton of air conditioning can take away 12,000 BTUs of air according to hour.

Mechanical Engineering Interview Questions
Question thirteen. What Is An Air Conditioning Ton?

Answer :

A ton is the cooling ability of an air con system. One ton is identical to the quantity of warmth required (288,000 Btu) to melt one ton of ice in a 24-hour duration. A one-ton air conditioner is rated at 12,000 Btu consistent with hour (288,000/24). A two-ton unit could be rated at 24,000 Btu in keeping with hour.

Question 14. What Is Btu?

Answer :

The British thermal unit (Btu or BTU) is a traditional unit of warmth; it's far described as the quantity of heat required to raise the temperature of one pound of water by way of one diploma Fahrenheit. ... Heat is referred to now to be equal to energy, for which the metric unit is the joule; one BTU is about 1055 joules.

Question 15. What Is The Meaning Of Btu In Air Conditioners?

Answer :

Btu – British Thermal Unit (Btu) is the worldwide degree of energy. A Btu is the amount of heat needed to improve 1 (one) pound of water by means of 1(one) degree Fahrenheit. In HVAC enterprise, Btu's measure the quantity of heat a conditioning unit can take away from a room consistent with hours. One BTU in step with hour is equal to 0293 watts.

WASH Officer (Water, Sanitation, and Hygiene) Interview Questions
Question 16. What Is Cfm & Infiltration?

Answer :

The infiltration price is the volumetric float charge of out of doors air right into a building, normally in cubic toes in step with minute (CFM) or liters in keeping with 2d (LPS). The air alternate price, (I), is the wide variety of interior volume air modifications that arise in line with hour, and has units of 1/h.

Question 17. What Is The Hvac System?

Answer :

While the Energy Center commonly attempts to avoid the usage of acronyms, HVAC is in not unusual use within the heating and cooling industry. It stands for "heating, ventilation and air con," three capabilities regularly blended into one gadget in modern-day modern houses and buildings.

Watershed Interview Questions
Question 18. What Does A Hvac Engineer Do?

Answer :

An HVAC engineer's task duties can consist of the layout, installation, maintenance, and repair of heating, air flow, air conditioning, cooling, and refrigeration structures.

Air Conditioning and Refrigeration Interview Questions
Question 19. What Is Psychometry?

Answer :

Psychometry is a psychic capacity wherein a person can feel or "read" the records of an item by means of touching it. Such someone can receive impressions from an object by using retaining it in his/her palms or, possibly, touching it to the brow.

Question 20. What Are The Types Of Air Conditioning Systems?

Answer :

Types of Air Conditioning Systems

The preference of which air conditioner machine to use depends upon more than a few of factors along with how massive the vicinity is to be cooled, the overall warmth generated within the enclosed location, and so on. 

Window Air Conditioner. 
Split Air Conditioner. 
Packaged Air Conditioner. 
Central Air Conditioning System.
Solar Water Pumps Interview Questions
Question 21. How The Lighting Load Is Calculated?

Answer :

The general method includes 3 calculation steps: General lighting fixtures VA load. When calculating department circuits and feeder/carrier hundreds for dwellings, consist of a minimum 3VA in line with squaretoes for preferred lights and widespread-use receptacles [220.12]. When figuring out the vicinity, use the outdoor dimensions of the dwelling.

Question 22. What Is The Function Of Ahu?

Answer :

An Air Handling Unit (AHU) is used to re-situation and flow into air as part of a heating, ventilating and air-conditioning machine. The simple function of the AHU is soak up outdoor air, re-situation it and supply it as sparkling air to a building.

Question 23. How Does The Ahu Work?

Answer :

An air handler is mostly a large metal field containing a blower, heating or cooling elements, clear out racks or chambers, sound attenuators, and dampers. Air handlers commonly connect to a ductwork air flow gadget that distributes the conditioned air via the constructing and returns it to the AHU.

Mechanical Fitter Interview Questions
Question 24. What Is The Purpose Of Air Handling Units?

Answer :

An air handler, or air dealing with unit (often called an AHU), is used to situation and flow into air as a part of an HVAC device. An air handler generally includes a blower, heating or cooling elements, clear out racks or chambers, sound attenuators, and dampers.

Plumbing Interview Questions
Question 25. Where The Fcu’s Are Used?

Answer :

A fan coil unit is a simple tool along with a heating or cooling coil and fan. It is a part of an HVAC gadget discovered in residential, industrial, and buildings. Typically a fan coil unit isn't always connected to ductwork and is used to control the temperature in the space wherein it is set up, or serve multiple spaces.

Question 26. What Is The Fcu?

Answer :

A Fan Coil Unit (FCU) is a easy tool which includes a heating and/or cooling warmness exchanger or 'coil' and fan. It is part of an HVAC system determined in residential, business, and industrial buildings.

Water Softener Interview Questions
Question 27. What Is The Meaning Of Fahu?

Answer :

FAHU is the abbreviation used for FRESH AIR HANDLING UNIT. These are generally centralized units hired to induce sparkling air portions to the confines areas. They come into photograph anyplace there are limitations to clean air consumption both immediately or via AHUs.

Aircraft Maintenance Interview Questions
Question 28. What Is An Air Conditioner Condenser?

Answer :

The AC condenser is a very essential issue found on genuinely all cutting-edge car AC structures. Its number one characteristic is to convert the refrigerant coming from the compressor from a high temperature, high pressure vapor into a high stress liquid through condensation.

Question 29. ??how Does A Condenser In A Refrigerator Work?

Answer :

In the refrigeration cycle, there are five simple components: fluid refrigerant; a compressor, which controls the glide of refrigerant; the condenser coils (at the outdoor of the refrigerator); the evaporator coils (on the inside of the refrigerator); and something known as an expansion device.

Question 30. What Is The Main Function Of A Condenser?

Answer :

In structures involving warmth switch, a condenser is a tool or unit used to condense a substance from its gaseous to its liquid state, by means of cooling it. In so doing, the latent warmness is given up through the substance, and will switch to the condenser coolant.

Question 31. How Does A Condensing Unit Work?

Answer :

Inside the condenser, the refrigerant vapor is compressed and forced thru a warmth change coil, condensing it right into a liquid and rejecting the heat previously absorbed from the cool indoor place. The condenser's heat exchanger is commonly cooled through a fan blowing out of doors air through it.

Question 32. What Are The Types Of Condensers?

Answer :

The three most important sorts of condensers utilized in fashionable refrigeration structures are:

air-cooled.
Water-cooled.
Evaporative.
Question 33. What Is A Rotary Air Compressor?

Answer :

A rotary-screw compressor is a form of gas compressor that uses a rotary-type wonderful-displacement mechanism. They are typically used to replace piston compressors in which massive volumes of high-stress air are wanted, both for massive business programs or to function excessive-strength air equipment such as jackhammers.

Revit Interview Questions
Question 34. What Is A Gas Compressor Used For?

Answer :

A gas compressor is a mechanical tool that increases the strain of a fuel by way of lowering its quantity. An air compressor is a particular type of gasoline compressor. Compressors are similar to pumps: both growth the stress on a fluid and both can shipping the fluid through a pipe.

Question 35. What Is The Use Of Compressor In Refrigeration?

Answer :

The compressor does precisely as its name says: it compresses the refrigerant. The compressor gets low pressure fuel from the evaporator and converts it to excessive strain gas. As mentioned in advance, as the fuel is compressed, the temperature rises. The warm refrigerant gasoline then flows to the condenser.