Global Coal & Mining Interview Questions and Answers

A circuit breaker is an electrical switch that automatically interrupts the flow of current when it exceeds a certain limit.

• It is used to protect electrical circuits from damage caused by overloading or short circuiting.

• It works by detecting the excess current and tripping the switch to break the circuit.

• It can be reset manually or automatically depending on the type of circuit breaker.

• Examples include thermal circuit ...read more

There are typically three levels of voltage used in industry: low voltage, medium voltage, and high voltage.

• Low voltage is typically used for lighting and small appliances

• Medium voltage is used for larger equipment and machinery

• High voltage is used for power transmission and distribution

• The specific voltage levels may vary depending on the industry and location

• Safety measures must be taken when working with high voltag...read more

DG is a backup power source for a plant. It works by converting fuel into electricity.

• DG stands for Diesel Generator

• It is required for a plant to ensure uninterrupted power supply in case of power outages or grid failures

• DG works by converting fuel (usually diesel) into mechanical energy which is then converted into electrical energy

• It consists of an engine, alternator, fuel system, cooling system, and control panel

• DGs...read more

A weight bridge is a device used to measure the weight of vehicles and their contents.

• It consists of a platform on which the vehicle is driven and sensors that measure the weight.

• The sensors send the weight data to a computer or display for the user to read.

• Weight bridges are commonly used in industries such as transportation, agriculture, and waste management.

• They are also used by government agencies to enforce weight...read more

Inverters in solar power plants convert DC electricity generated by solar panels into AC electricity for use in the grid.

• Convert DC electricity from solar panels to AC electricity for use in the grid

• Maximize energy production by optimizing power output

• Monitor performance and communicate data to the central control system

• Provide grid stabilization and voltage regulation

• Examples: Central inverters, string inverters, micr...read more

Power transformers in a solar power plant are essential for converting the generated electricity to a higher voltage for efficient transmission.

• Power transformers step up the voltage of electricity generated by solar panels for efficient transmission over long distances.

• They help in reducing energy losses during transmission by minimizing the current flow.

• Power transformers also play a role in connecting the solar powe...read more

As a Weigh Bridge Operator, your work involves weighing vehicles, recording data, and ensuring compliance with regulations.

• Weigh vehicles accurately using the weigh bridge equipment

• Record and maintain accurate data of the weight and other relevant information

• Ensure compliance with legal and safety regulations

• Communicate with drivers and provide necessary instructions

• Inspect and maintain the weigh bridge equipment

• Report...read more