L&T Construction Electrical Site Engineer Interview Questions and Answers

Q1. Typers of motor starters
Ans. 
Motor starters are devices used to start and stop motors. There are various types of motor starters.
• Direct On Line (DOL) starters

• Star-Delta starters

• Soft starters

• Variable Frequency Drive (VFD) starters

• Auto transformer starters
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Q1. Salary expectations
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Quality of question was very good. Not easy..but not hard either.

Q1. You have to have good technical knowledge to clear this round.
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Q2. Basics of Etech, Electrical Machine, Power electronics.
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Q1. Difference between rccb & mcb
Ans. 
RCCB and MCB are both electrical protection devices, but they differ in their functionality and applications.
• RCCB stands for Residual Current Circuit Breaker, while MCB stands for Miniature Circuit Breaker.

• RCCB is designed to protect against electrical leakage and ground faults, while MCB is primarily used for overcurrent protection.

• RCCB detects the imbalance in current between the live and neutral wires, while MCB det...read more
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Q2. Circuit diagram of motor starter
Ans. 
A motor starter circuit diagram is used to start and stop an electric motor.
• Motor starters typically consist of a contactor, overload relay, and start/stop buttons.

• The contactor is used to switch the motor on and off.

• The overload relay protects the motor from overheating.

• The start/stop buttons are used to control the motor.

• The circuit diagram shows the connections between these components.
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