Thermax Limited C&I Engineer Interview Questions, Process, and Tips

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