Reliance Infrastructure Interview Questions, Process, and Tips

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 of an alternating current (AC) power supply.

• They consist of two coils of wire, called the primary and secondary, wrapped around a magnetic core.

• When an AC current flows through the primary coil, it creates a magnetic field that in...read more

Earthing is the process of connecting electrical equipment to the earth to prevent electric shock.

• There are several types of earthing, including plate earthing, rod earthing, pipe earthing, and strip earthing.

• Plate earthing involves burying a copper plate in the earth and connecting it to the electrical equipment.

• Rod earthing involves driving a copper rod into the earth and connecting it to the electrical equipment.

• Pip...read more

Circuit breakers are of different types such as thermal, magnetic, hydraulic-magnetic, and residual current devices.

• Thermal circuit breakers use a bimetallic strip to trip the breaker when it gets too hot.

• Magnetic circuit breakers use an electromagnet to trip the breaker when it detects an overload.

• Hydraulic-magnetic circuit breakers combine the features of both thermal and magnetic circuit breakers.

• Residual current de...read more

Star delta starter is an electrical motor starting mechanism that reduces the starting current and torque.

• Used for starting high power motors

• Consists of three contactors and a timer

• Initially starts the motor in star configuration and then switches to delta configuration

• Reduces starting current and torque

• Commonly used in industrial applications

Buchholz relay is a protective device used in oil-filled transformers to detect and prevent faults.

• It is a type of gas actuated relay

• It is installed in the oil-filled transformer tank

• It detects the presence of gas or air bubbles in the oil

• It trips the transformer if a fault is detected

• It helps to prevent major damage to the transformer

Merit order is the ranking of power plants based on their cost of production. Fixed charge is the cost of capital investment while variable charge is the cost of fuel and maintenance.

• Merit order is used to determine which power plants will be dispatched first based on their cost of production.

• Fixed charge is the cost of capital investment in the power plant, including the cost of building and maintaining the plant.

• Vari...read more