Punj Lloyd Mechanical Maintenance Foreman Interview Questions and Answers

The question covers power factor of transformer, types of DC machine, working principle of AC alternator, and DC motors.

• Power factor of a transformer is the ratio of real power to apparent power.

• Types of DC machines include DC motors and DC generators.

• AC alternators work on the principle of electromagnetic induction to convert mechanical energy into electrical energy.

• DC motors convert electrical energy into mechanical ...read more

A transformer is an electrical device that transfers electrical energy between two or more circuits through electromagnetic induction.

• Transformers are used to increase or decrease the voltage levels in electrical power transmission and distribution systems.

• They consist of two or more coils of wire, known as windings, which are wound around a core made of magnetic material.

• The primary winding is connected to the input v...read more

Current in a motor can be found using an ammeter.

• Connect the ammeter in series with the motor

• Turn on the motor and measure the current

• Current can be found using the formula I = V/R

• Use a clamp meter to measure current without breaking the circuit

There are various types of CCTV cameras such as dome, bullet, PTZ, thermal, and covert cameras.

• Dome cameras are commonly used for indoor surveillance and have a wide-angle view.

• Bullet cameras are weatherproof and have a longer range than dome cameras.

• PTZ cameras can pan, tilt, and zoom to cover a larger area.

• Thermal cameras use heat signatures to detect movement and are often used in low-light environments.

• Covert camer...read more

CCTV stands for Closed Circuit Television. It is a system of video cameras used for surveillance and security purposes.

• CCTV cameras are commonly used in public places like banks, airports, and shopping malls.

• They can also be used in homes and businesses for security purposes.

• CCTV footage can be used as evidence in criminal investigations.

• The use of CCTV has raised concerns about privacy and civil liberties.

• Advancements...read more

Structural analysis involves methods to determine the behavior of structures under different loads and conditions.

• Structural analysis is used to determine the strength, stiffness, and stability of structures.

• Methods include finite element analysis, matrix methods, and computer simulations.

• Terms include stress, strain, deformation, and buckling.

• Structural analysis is important in designing safe and efficient structures.

• ...read more