3i Infotech Executive Engineer Interview Questions, Process, and Tips

Transformer earthing types include solid earthing, resistance earthing, and reactance earthing. The size of the transformer neutral earthing conductor depends on the transformer rating.

• Solid earthing involves connecting the transformer neutral directly to the earth

• Resistance earthing involves connecting a resistor between the transformer neutral and earth

• Reactance earthing involves connecting a reactor between the tran...read more

Improving power factor can be done by using capacitors, synchronous motors, and active power filters.

• Installing capacitors to reduce reactive power consumption

• Using synchronous motors to improve power factor

• Using active power filters to reduce harmonic distortion

• Implementing power factor correction techniques

• Reducing the use of inductive loads

• Proper maintenance of electrical equipment

• Educating employees on energy-effic

AC drives are used for high power applications and DC drives are used for low power applications.

• AC drives are more efficient than DC drives.

• AC drives are more expensive than DC drives.

• DC drives are simpler and easier to control than AC drives.

• DC drives are commonly used in small motors and appliances.

• AC drives are commonly used in large motors and industrial applications.

Earthing is the process of connecting the metallic parts of an electrical appliance or installation to the earth wire.

• Types of earthing include plate earthing, pipe earthing, rod earthing, and strip earthing.

• Plate earthing involves burying a plate made of copper or galvanized iron in the earth.

• Pipe earthing involves using a pipe made of GI or copper to connect the electrical appliance to the earth.

• Rod earthing involves...read more

ACB stands for Air Circuit Breaker. It works on the principle of thermal and magnetic tripping.

• ACB is used to protect electrical equipment from overcurrent and short circuit faults.

• It consists of a set of contacts that open and close to interrupt or allow the flow of current.

• The thermal tripping mechanism operates based on the heat generated by the current flowing through the contacts.

• The magnetic tripping mechanism op...read more

Induction motor works on the principle of electromagnetic induction and has two types - single-phase and three-phase.

• Induction motor has a stator and a rotor

• The stator has a set of windings that are supplied with AC current

• This current creates a rotating magnetic field that induces a current in the rotor

• The rotor then starts rotating due to the interaction of the magnetic fields

• Single-phase induction motors are used in...read more