Blue Star Fire Alarm Supervisor Interview Questions and Answers

Q1. (1)Why transformers rating is in kva ?
Ans. 
Transformers rating is in kVA because it takes into account both voltage and current.
• kVA is a unit of apparent power, which is the combination of real power (measured in kW) and reactive power (measured in kVAR).

• Transformers are designed to handle a certain amount of power, and kVA rating takes into account both the voltage and current that the transformer can handle.

• For example, a transformer with a rating of 100 kVA ...read more
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Q2. What is difference between ground and earth
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Ground is a conducting body that is used as a reference point for electrical circuits, while earth is a large conducting body that acts as a sink for electrical charges.
• Ground is a reference point for electrical circuits, while earth is a sink for electrical charges.

• Ground is a local concept, while earth is a global concept.

• Ground is a man-made concept, while earth is a natural concept.

• Ground is used to prevent electri...read more
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Q1. Treated fresh unit equipment parts name ??
Ans. 
Treated fresh unit equipment parts are components used in the treatment of fresh water in a unit.
• Pumps

• Filters

• Valves

• Chemical dosing systems

• Control panels

• Flow meters
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Q2. TFA working principle ??
Ans. 
TFA stands for Thin Film Antenna. It is a type of antenna that uses a thin film of conductive material to transmit and receive signals.
• TFA works on the principle of using a thin film of conductive material as the antenna element.

• The conductive film is usually made of materials like copper or gold.

• The film is deposited on a substrate, which provides mechanical support and insulation.

• TFA antennas are lightweight, flexibl...read more
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Q3. Heat load calculation??
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Q4. How to calculate duct size ??
Ans. 
Duct size can be calculated based on the required airflow, velocity, and friction loss.
• Determine the required airflow for the space or system.

• Calculate the velocity of the air based on the desired airflow and the cross-sectional area of the duct.

• Consider the friction loss in the duct system due to fittings, bends, and length.

• Use duct sizing charts or software to find the appropriate duct size based on the calculated ve...read more
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Q5. AHU and chiller working with diagram ??
Ans. 
AHU and chiller are essential components of HVAC systems.
• AHU stands for Air Handling Unit and is responsible for circulating and conditioning air within a building.

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

• AHU and chiller work together to provide cooled air to the building.

• AHU takes in outside air, filters it, cools or heats it, and then distributes i...read more
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Q6. How ventilation CFM calculate.
Ans. 
Ventilation CFM is calculated by determining the volume of air to be exchanged per minute.
• CFM stands for Cubic Feet per Minute.

• To calculate ventilation CFM, you need to know the volume of the space and the desired air exchange rate.

• The formula to calculate CFM is: CFM = (Volume of Space) x (Air Exchange Rate)

• For example, if the volume of a room is 1000 cubic feet and the desired air exchange rate is 5 times per hour, t
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Q1. Current CTC and expected CTC ??
Ans. 
The current CTC and expected CTC are financial aspects of the job that need to be discussed during the negotiation process.
• Current CTC refers to the current salary or compensation package of the candidate.

• Expected CTC refers to the salary or compensation package the candidate is looking for in the new role.

• These figures are important for both the employer and the candidate to ensure alignment and avoid any misunderstan...read more
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Q2. Notice period and sooner you can join ??
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Q1. How to calculate Exhaust CFM calculate??
Ans. 
Exhaust CFM can be calculated by determining the air volume flow rate in cubic feet per minute.
• Determine the area of the exhaust opening

• Measure the velocity of the air being exhausted

• Multiply the area by the velocity to get the air volume flow rate in cubic feet per minute
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Q2. Duct size with gauge??
Ans. 
Duct size is determined by the gauge of the material used.
• Duct size refers to the dimensions of the ductwork used in HVAC systems.

• The gauge of the material refers to its thickness or weight.

• Thicker gauge materials are used for larger duct sizes to ensure structural integrity.

• Common gauges for ductwork range from 26 to 16, with lower numbers indicating thicker materials.

• For example, a 16-gauge duct would be used for lar...read more
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How to work in HT line

Q1. Explain , what types of work you have completed.
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Q2. Explain, each every individual work which is you doing in project work.
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Q1. Earthing dimension
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Q2. How many pole 1km cabling
Ans. 
The number of pole 1km cabling required depends on the specific project requirements and design considerations.
• The number of pole 1km cabling needed will depend on the distance to be covered and the spacing between poles.

• Factors such as terrain, existing infrastructure, and local regulations will also impact the number of poles required.

• For example, in a straight road with no obstacles, fewer poles may be needed compar...read more
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Q3. Pole base plate size
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The size of the pole base plate depends on the load requirements and soil conditions.
• The size of the pole base plate should be determined by the structural engineer based on the load requirements of the pole.

• The soil conditions at the site also play a crucial role in determining the size of the base plate.

• Factors such as wind load, seismic activity, and the weight of the pole itself should be considered when determinin
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Q4. Stay plate dimension
Ans. 
Stay plate dimensions are typically specified by the engineer or designer based on the specific requirements of the structure.
• Stay plate dimensions are determined based on the load and stress requirements of the structure.

• The dimensions of stay plates can vary depending on the material used and the design specifications.

• Stay plates are often designed to distribute loads and provide stability in structures such as bridg
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Q1. Notice period of joining
Ans. 
Typically 1-3 months notice period is required before joining a new job.
• Notice period is the time between accepting a job offer and starting the new job.

• It allows the current employer time to find a replacement and for the employee to wrap up their work.

• Notice periods can vary depending on company policy and the level of the position.

• It is common for notice periods to be 1-3 months in duration.

• Some companies may requir...read more
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