Infosys Eelectronics Enng. and Electrical Enng. as Work Maintenance Electrical Interview Questions and Answers

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 voltage levels in electrical circuits.

• They consist of two coils of wire, known as the primary and secondary coils.

• The primary coil is connected to the input voltage source, while the secondary coil is connected to the output load.

• Transformers...read more

UPS stands for Uninterruptible Power Supply, a device that provides emergency power to a load when the input power source fails.

• UPS ensures continuous power supply during power outages or fluctuations

• It typically consists of a battery, inverter, and charger

• Commonly used in data centers, hospitals, and critical infrastructure

• Examples include APC, CyberPower, and Eaton UPS systems

MCB stands for Miniature Circuit Breaker, a device designed to protect electrical circuits from overloads and short circuits.

• MCB is a type of circuit breaker that automatically switches off electrical circuits during abnormal conditions like overload or short circuit.

• It is commonly used in residential and commercial electrical installations to protect electrical equipment and prevent electrical fires.

• MCBs are available...read more

Current is the flow of electric charge, measured in Amperes, while voltage is the force that drives the current, measured in Volts.

• Current is the rate of flow of electric charge in a circuit.

• Voltage is the electrical potential difference that drives the current.

• Current is measured in Amperes (A) while Voltage is measured in Volts (V).

• Ohm's Law relates current, voltage, and resistance: V = I * R.

CT and PT are electrical devices used in power systems to measure current and voltage respectively.

• CT stands for Current Transformer and is used to measure high currents by stepping down the current to a lower value.

• PT stands for Potential Transformer and is used to measure high voltages by stepping down the voltage to a lower value.

• CTs and PTs are commonly used in power distribution systems to provide accurate measure

The last rating MCB can go up to 125 amps.

• The last rating MCB can typically go up to 125 amps.

• MCBs are available in various ratings such as 6A, 10A, 16A, 32A, 63A, and 125A.

• The rating of an MCB determines the maximum current it can safely handle before tripping.

• For higher current requirements, larger MCBs or other protective devices like MCCBs may be used.

I have 3 years of experience working as an Electrical Engineer in a power distribution company.

• Designed electrical systems for new construction projects

• Performed regular maintenance on electrical equipment

• Troubleshooted and repaired electrical issues in a timely manner

Unequal 3-phase AC line voltage can cause various issues in electrical systems.

• Unequal voltage can cause unbalanced loads, leading to overheating and damage to equipment.

• It can also cause voltage drops and affect the performance of motors and other devices.

• Proper monitoring and maintenance can help prevent these issues.

• Possible causes of unequal voltage include faulty wiring, damaged transformers, and unbalanced loads.

• ...read more

Possible causes could be faulty motor, broken belt, or tripped overload protection.

• Check if the motor is receiving power and if the starter is functioning properly.

• Inspect the motor for any signs of damage or wear and tear.

• Check the belt for any signs of damage or if it has come off the pulley.

• Check the overload protection to see if it has tripped and needs to be reset.

• If all else fails, consult a professional for furt