Thermax Limited Interview Questions, Process, and Tips

There are several types of tube materials used in various industries.

• Common tube materials include steel, copper, aluminum, and plastic.

• Steel tubes are often used in construction and industrial applications due to their strength and durability.

• Copper tubes are commonly used in plumbing and HVAC systems for their excellent heat transfer properties.

• Aluminum tubes are lightweight and corrosion-resistant, making them suita...read more

Types of tubes materials

• There are various materials used for tubes, including metals, plastics, and ceramics.

• Metal tubes are commonly made from stainless steel, copper, or aluminum.

• Plastic tubes can be made from materials like PVC, polyethylene, or polypropylene.

• Ceramic tubes are often used in high-temperature applications and can be made from materials like alumina or zirconia.

• The choice of tube material depends on fa...read more

The percentage setting of a line safety valve depends on the specific system and its requirements.

• The percentage setting is determined by the pressure drop across the valve and the required flow rate.

• Typically, line safety valves are set between 10-20% above the system's operating pressure.

• However, this can vary depending on the specific system and its requirements.

• It is important to ensure that the valve is set correc...read more

The question is asking about the tonnage flow rate of the attemper flow.

• The tonnage flow rate refers to the amount of material or substance flowing through a system per unit of time.

• The attemper flow is a term used in control room engineering to describe the flow of a cooling medium, such as water, to regulate temperature.

• To answer the question, specific data on the attemper flow rate in tons would be required.

Interlocking of boiler is a safety mechanism that prevents unsafe conditions in the boiler.

• Interlocking ensures that all safety devices are in place and functioning properly before the boiler can start.

• It also prevents the boiler from starting if any of the safety devices fail or malfunction.

• Interlocking can be achieved through electrical or mechanical means.

• Examples of interlocking devices include pressure switches, t...read more

pH value is critical in feed pump and boiler to maintain water quality and prevent corrosion.

• pH value in feed pump should be between 7.5 to 9.5 to prevent corrosion and scaling

• pH value in boiler should be between 10.5 to 12.0 to prevent acidic corrosion

• pH value can be controlled by adding chemicals like sodium hydroxide or sulfuric acid

• Regular monitoring and adjustment of pH value is necessary to ensure efficient opera

RTDs measure temperature by correlating resistance changes in a metal with temperature variations.

• RTD stands for Resistance Temperature Detector.

• RTDs typically use pure platinum due to its stable resistance-temperature relationship.

• The resistance of an RTD increases with temperature, following a known curve.

• Common RTD configurations include 2-wire, 3-wire, and 4-wire setups for accuracy.

• To calculate temperature, use th...read more

A thermocouple is a temperature sensor that generates voltage based on the Seebeck effect between two different metals.

• Consists of two dissimilar metal wires joined at one end.

• When heated, a voltage is generated proportional to the temperature difference.

• Common types include Type K (Chromel-Alumel) and Type J (Iron-Constantan).

• Used in various applications like industrial processes, HVAC systems, and ovens.

• Can measure a...read more

Boiler interlocks ensure safe operation by preventing unsafe conditions through automated controls and safety mechanisms.

• Low Water Level Interlock: Prevents boiler operation if water level is too low to avoid overheating.

• High Pressure Interlock: Shuts down the boiler if pressure exceeds safe limits to prevent explosions.

• Flame Failure Interlock: Stops fuel supply if the flame goes out, preventing unburned fuel accumulat...read more

Flow transmitters measure fluid flow rates using various principles like differential pressure, electromagnetic, and ultrasonic methods.

• Differential Pressure Flow Transmitters: Measure pressure drop across an orifice plate; commonly used in oil and gas industries.

• Electromagnetic Flow Meters: Utilize Faraday's law of electromagnetic induction; ideal for conductive fluids like water.

• Ultrasonic Flow Meters: Use sound wave...read more