Exicom Electrical Engineer Interview Questions and Answers

Switchgear is an electrical equipment that controls, protects, and isolates electrical circuits.

• Switchgear is used to control power supply in electrical systems.

• It protects electrical equipment from damage caused by overloads, short circuits, and faults.

• Types of switchgear include low voltage, medium voltage, and high voltage switchgear.

• Relays are used in switchgear to control the flow of electricity.

• Types of relays include electromagnetic, thermal, and solid-state relays.

A 100Ah battery has a higher capacity than a 75Ah battery, thus it will last longer under the same load conditions.

• Battery capacity is measured in ampere-hours (Ah), indicating how much current a battery can supply over a specific time.

• A 100Ah battery can theoretically provide 100 amps for 1 hour, while a 75Ah battery can provide 75 amps for the same duration.

• If both batteries are used to power the same device drawing 10 amps, the 100Ah battery will last 10 hours, while the 7...read more

A substance has resistance due to the opposition it offers to the flow of electric current.

• Resistance is caused by collisions between electrons and atoms in the substance.

• The resistance of a substance depends on its physical properties such as length, cross-sectional area, and temperature.

• Some substances have higher resistance than others, such as insulators compared to conductors.

• Resistance can be measured in ohms using Ohm's law.

SCR and TRIAC are semiconductor devices used for switching and controlling power in electronic circuits.

• SCR stands for Silicon Controlled Rectifier and is a four-layer PNPN semiconductor device used for power control applications.

• TRIAC stands for Triode for Alternating Current and is a three-layer PNPN semiconductor device used for AC power control applications.

• Both devices work by controlling the flow of current through them using a gate signal.

• SCR is a unidirectional device...read more

Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points.

• Ohm's law is a fundamental principle in electrical engineering

• It states that the current through a conductor is directly proportional to the voltage across it

• The proportionality constant is the resistance of the conductor

• Ohm's law is often used to calculate the current, voltage, or resistance in a circuit

• For example, if the voltage across a re...read more