Bharat Coking Coal Apprentice Electrician Interview Questions and Answers

A transformer is an electrical device that transfers electrical energy from one circuit to another through electromagnetic induction.

• Transformers are used to increase or decrease the voltage of an alternating current (AC) power supply.

• They consist of two coils of wire, known as the primary and secondary coils, which are wrapped around a magnetic core.

• When an AC voltage is applied to the primary coil, it creates a magne...read more

The type of breaker used depends on the electrical load and the circuit requirements.

• The most common types of breakers are standard, AFCI, GFCI, and dual-function.

• Standard breakers are used for general-purpose circuits.

• AFCI breakers are used for circuits that power bedrooms and living rooms.

• GFCI breakers are used for circuits that power bathrooms, kitchens, and outdoor areas.

• Dual-function breakers combine AFCI and GFCI...read more

Conductors are materials that allow electricity to flow through them. There are different types of conductors used in electrical systems.

• Copper is the most commonly used conductor in electrical wiring

• Aluminum is also used as a conductor, especially in high voltage power transmission

• Silver is the best conductor, but it is too expensive for most applications

• Gold is also a good conductor, but it is even more expensive tha...read more

MCB is a miniature circuit breaker while MCCB is a molded case circuit breaker.

• MCB is used for low current applications while MCCB is used for high current applications.

• MCB is rated up to 100 amps while MCCB can be rated up to 2500 amps.

• MCCB has adjustable trip settings while MCB does not.

• MCCB is more expensive than MCB.

• Examples of MCB brands include Legrand and Schneider while examples of MCCB brands include Siemens a

MGND stands for Main Ground. It refers to the primary grounding point in an electrical system.

• MGND is the main grounding point in an electrical system.

• It is typically connected to the earth ground to provide a safe path for electrical current to flow in case of a fault.

• MGND helps protect equipment and personnel from electrical shocks.

• It is an essential component in ensuring electrical safety and proper functioning of t

Grounding negative in inverters helps in reducing electromagnetic interference (EMI) and noise.

• Grounding negative in inverters helps in reducing EMI and noise.

• It also helps in improving the efficiency of the inverter.

• Grounding negative is done to provide a reference point for the inverter's output voltage.

• It also helps in protecting the inverter from voltage spikes and surges.

• Examples of inverters that use negative gro...read more