Larsen & Toubro Group Senior QA QC Engineer Interview Questions and Answers

Acceptance criteria for welding defects

• Acceptance criteria for welding defects are specified in codes and standards such as AWS D1.1, ASME Section VIII, and API 1104

• The criteria depend on the type of defect, its location, and the material being welded

• Examples of acceptance criteria include maximum allowable size and number of defects, distance from the weld centerline, and type of defect

• Defects that exceed the acceptan...read more

Pipe coating procedure involves applying a protective layer on the surface of the pipe to prevent corrosion and damage.

• The surface of the pipe should be cleaned and prepared before coating.

• The coating material should be selected based on the type of pipe and its intended use.

• The coating should be applied evenly and in accordance with the manufacturer's instructions.

• The coating should be inspected for defects and thickn...read more

To prepare measurement, follow these steps

• Identify the parameter to be measured

• Select the appropriate measuring instrument

• Calibrate the instrument before use

• Ensure the instrument is in good working condition

• Take multiple measurements to ensure accuracy

• Record the measurements accurately

• Analyze the data to draw conclusions

Alignment methods are techniques used to ensure proper positioning and orientation of mechanical components.

• Common alignment methods include laser alignment, dial indicator alignment, and straight edge alignment.

• Laser alignment uses a laser beam to measure and adjust the alignment of components.

• Dial indicator alignment uses a dial gauge to measure the alignment of components.

• Straight edge alignment involves using a str...read more

Questions related to general working ranges, temperature sensors, and purpose of instruments for Instrumentation Engineer position.

• General current and voltage working ranges of instruments depend on the type of instrument and its application.

• Temperature sensors types include thermocouples, RTDs, thermistors, and infrared sensors.

• Thermocouples work on the principle of Seebeck effect, while RTDs work on the principle of ...read more