L&T Power Electrician Interview Questions and Answers

The current in a 3 phase system depends on the voltage and power of the system.

• The current in a 3 phase system can be calculated using the formula: I = P / (sqrt(3) * V)

• Where I is the current, P is the power, and V is the voltage

• For example, if the power is 1000W and the voltage is 240V, the current would be approximately 4.33A

MCB stands for Miniature Circuit Breaker, a device designed to protect electrical circuits from overloads and short circuits.

• MCB is a type of circuit breaker that automatically switches off electrical circuits during abnormal conditions like overload or short circuit.

• It is commonly used in residential and commercial electrical installations to protect wiring and electrical equipment.

• MCBs are available in different curr...read more

To check AC DC current, use a multimeter set to the appropriate setting and connect the probes to the circuit being tested.

• Set the multimeter to the AC or DC current setting depending on what you are testing.

• Ensure the multimeter probes are connected correctly to the circuit being tested.

• Read the current measurement displayed on the multimeter.

• For AC current, make sure the multimeter is set to the appropriate range (e....read more

To check cable continuity, use a multimeter to measure resistance between two points on the cable.

• Use a multimeter set to the resistance or continuity mode.

• Connect one probe to one end of the cable and the other probe to the other end.

• A low resistance reading indicates good continuity, while a high resistance or infinite reading indicates a break in the cable.

• Check for continuity in each conductor of the cable separate...read more

PVC stands for Polyvinyl Chloride, a type of plastic commonly used in construction and electrical applications.

• PVC is a versatile material known for its durability and resistance to chemicals.

• It is commonly used in electrical wiring, plumbing pipes, and vinyl flooring.

• PVC is lightweight, easy to install, and cost-effective compared to other materials.

• Examples of PVC products include PVC pipes, PVC electrical conduits,

The motor work in AC is based on electromagnetic induction, while in DC it is based on the Lorentz force principle.

• AC motors work on the principle of electromagnetic induction, where a changing magnetic field induces a current in the rotor coils.

• DC motors operate based on the Lorentz force principle, where a current-carrying conductor in a magnetic field experiences a force.

• Examples of AC motors include induction motor...read more