HVAC Systems Interview Questions and Answers

Piles are used in construction to transfer loads from a structure to a stronger layer of soil or rock below the surface.

• Types of piles include driven piles, bored piles, and screw piles.

• Piles are provided to support structures on weak or compressible soil, to resist uplift forces, or to provide lateral support.

• The diameter of a pile is determined based on the load it needs to support and the soil conditions.

• LVUP (Large...read more

The layout plan of a switching station includes the arrangement of equipment and the number of interrupters used.

• The layout plan of a switching station is designed to ensure efficient and safe operation.

• It includes the arrangement of various equipment such as transformers, circuit breakers, and disconnect switches.

• The number of interrupters used in a switching station depends on the size and capacity of the station.

• Int...read more

The neutral section and section insulator in OHE have important functions in electrical systems.

• The neutral section is used to provide a return path for the current in the electrical system.

• It helps maintain the balance of electrical potential between the overhead wires and the ground.

• The section insulator is used to electrically isolate different sections of the overhead wires.

• It prevents the flow of current between a...read more

The percentage of steel in a pile varies depending on the type and design of the pile.

• The percentage of steel in a pile can range from 0% to over 90%.

• The type of pile (e.g. steel, concrete, timber) and its design (e.g. diameter, length, wall thickness) determine the percentage of steel.

• Steel piles typically have a higher percentage of steel than other types of piles.

• The percentage of steel in a pile can also affect its

Pile built-up above cut off level as per IS code

• IS code specifies the maximum allowable pile length above cut off level

• Pile length above cut off level should not exceed 3 times the pile diameter

• Built-up pile above cut off level can cause structural instability and failure

Vertical tolerance for piles as per IS code

• As per IS 2911-1:2010, the vertical tolerance for piles is +/- 25mm

• This tolerance is applicable for both driven and cast-in-situ piles

• The tolerance is measured at the top of the pile and at intervals of 3m along the length

• If the deviation exceeds the tolerance limit, the pile may need to be rejected or remedial measures taken

Pile concrete consumption tolerance depends on various factors.

• Pile diameter and length

• Concrete mix design

• Placement method

• Quality control measures

• Environmental conditions

• Tolerance typically ranges from 5-10% of estimated consumption

• Regular monitoring and adjustment of concrete consumption is necessary

Unit weight of steel is 7850 kg/m³

• The unit weight of steel is the weight of a specific volume of steel

• It is measured in kilograms per cubic meter (kg/m³)

• The unit weight of steel is 7850 kg/m³

• This value may vary slightly depending on the composition and manufacturing process of the steel

Water density is the mass per unit volume of water.

• Water density is typically around 1000 kg/m^3 at 4 degrees Celsius.

• It can vary slightly with temperature and salinity.

• Water density is important in various fields such as oceanography, hydrology, and engineering.

DLC stands for Diamond-Like Carbon coating, which is a type of protective coating applied to surfaces. Thickness refers to the measurement of how thick the coating is.

• DLC is a thin film coating that provides hardness, wear resistance, and low friction properties.

• Thickness of DLC coating is typically measured in microns or nanometers.

• Examples of applications include coating on cutting tools, automotive components, and m

PQC stands for Pavement Quality Concrete and Dowel bar Dia refers to the diameter of dowel bars used in construction.

• PQC is a type of concrete used in pavement construction to ensure durability and strength.

• Dowel bar Dia refers to the diameter of dowel bars, which are used to transfer loads between slabs in concrete pavements.

• For example, a common dowel bar Dia used in pavement construction is 32mm.

EMB stands for Electro-Magnetic Ballast, which is a device used to regulate the flow of electrical current in fluorescent lighting fixtures.

• EMB is used in fluorescent lighting fixtures to control the flow of electrical current.

• It helps to stabilize the current and prevent flickering or buzzing in the lights.

• EMBs are commonly found in commercial buildings, offices, and industrial settings.

• Examples of EMB brands include