Himadri Speciality Chemical Interview Questions, Process, and Tips

A relay is an electrically operated switch that uses an electromagnet to control the flow of current in a circuit. A circuit breaker is a device that automatically interrupts the flow of current in a circuit when it detects an overload or short circuit.

• Relay is an electrically operated switch

• It uses an electromagnet to control the flow of current

• Circuit breaker automatically interrupts current flow in case of overload

The principle of transformer is based on electromagnetic induction, where a changing magnetic field induces a voltage in a coil. Induction machines work on the principle of electromagnetic induction to convert electrical energy into mechanical energy.

• Transformer operates on the principle of mutual induction, where two or more coils are wound on a common magnetic core.

• When an alternating current flows through the primar...read more

Generators and alternators are both electrical devices that convert mechanical energy into electrical energy, but they differ in their construction and working principles.

• Generators produce direct current (DC) while alternators produce alternating current (AC).

• Generators use a commutator and brushes to convert mechanical energy into electrical energy, while alternators use slip rings and brushes.

• Generators are typicall...read more

Losses in a transformer include copper losses and iron losses.

• Copper losses occur due to the resistance of the transformer windings.

• Iron losses, also known as core losses, occur due to hysteresis and eddy currents in the transformer core.

• Copper losses can be minimized by using larger conductor sizes and reducing the winding resistance.

• Iron losses can be reduced by using high-quality magnetic materials and minimizing th...read more

Birds do not get shocked when sitting on live wires due to the principle of equipotentiality.

• Birds do not complete the circuit as they are not grounded

• Birds have a high resistance to electricity due to their body structure

• Electricity follows the path of least resistance, which is the wire rather than the bird

Oil circuit breakers use oil as an arc extinguishing medium, while air circuit breakers use compressed air.

• Oil circuit breakers use oil as an arc extinguishing medium, while air circuit breakers use compressed air.

• Oil circuit breakers are typically used for high voltage applications, while air circuit breakers are more common in low to medium voltage applications.

• Oil circuit breakers require regular maintenance to ensu...read more