L&T Technology Services Technician Interview Questions and Answers

Transformers work on the principle of electromagnetic induction to transfer electrical energy between two or more circuits.

• Transformers have two coils of wire, known as primary and secondary coils, which are magnetically coupled.

• When an alternating current flows through the primary coil, it creates a changing magnetic field which induces a voltage in the secondary coil.

• The ratio of the number of turns in the primary an...read more

To replace a blown 22 kv line fuse, safety measures include de-energizing the line, using proper PPE, and following proper procedures.

• De-energize the line before attempting to replace the fuse

• Use insulated tools to avoid electrical shock

• Wear appropriate PPE such as rubber gloves, safety glasses, and flame-resistant clothing

• Follow proper lockout/tagout procedures to ensure the line remains de-energized during the replac...read more

Index point is a reference point used in NDT to mark the location of a defect or anomaly on a test specimen.

• Index point is typically a small mark or indicator placed near the defect for future reference.

• It helps in accurately locating and tracking defects during the inspection process.

• Index points can be physical markers like stickers or paint dots, or digital markers in software applications.

• For example, in ultrasonic...read more

DAC stands for Distance Amplitude Correction, used in ultrasonic testing to correct amplitude variations with distance. BP stands for Backwall Echo Attenuation, used to measure the strength of the backwall echo signal.

• DAC is used in ultrasonic testing to correct amplitude variations with distance

• BP is used to measure the strength of the backwall echo signal

• DAC is essential for accurate flaw detection in ultrasonic test...read more