10+ Manager – Electrical Interview Questions and Answers

Reflected waves are waves that bounce back after hitting a boundary. In drives, they can cause voltage spikes and affect performance.

• Reflected waves occur when a wave encounters a boundary and bounces back.

• In electrical drives, reflected waves can cause voltage spikes and affect the performance of the system.

• To simplify the impact of reflected waves in drives, measures like impedance matching and using filters can be implemented.

• Impedance matching ensures that the load impeda...read more

Power transformers are protected from hot spot failure through various measures.

• Hot spot failure in power transformers occurs when excessive heat is generated in a localized area, leading to insulation degradation and potential breakdown.

• To protect against hot spot failure, transformers are equipped with temperature monitoring devices such as thermocouples or resistance temperature detectors (RTDs).

• These temperature sensors continuously monitor the temperature of critical com...read more

Transformer and diesel generator sizing involves calculating load requirements and selecting appropriate equipment.

• Calculate total connected load to determine transformer size

• Consider future load growth when sizing transformers

• Calculate total power requirements to determine DG set size

• Factor in starting currents and power factor when sizing DG sets

• Consult manufacturer specifications for accurate sizing

Various types and sizes of cables are available in the market for different electrical applications.

• Types of cables include power cables, control cables, instrumentation cables, communication cables, etc.

• Sizes of cables range from small gauge sizes like 18 AWG to larger sizes like 1000 MCM.

• Examples of cables include THHN, XHHW, Cat5e, RG6, etc.

The process for calculating electrical load involves determining the total power consumption of all devices connected to a circuit or system.

• Identify all devices connected to the circuit or system

• Determine the power rating (in watts) of each device

• Calculate the total power consumption by summing up the power ratings of all devices

• Consider factors like power factor and diversity to account for variations in load

APFC stands for Automatic Power Factor Correction. It is a system used to improve power factor in electrical installations.

• APFC is designed to automatically monitor and adjust the power factor of electrical loads.

• It uses power factor correction capacitors to compensate for reactive power and improve the overall power factor.

• The wiring diagram of an APFC system typically includes a power factor controller, contactors, capacitors, and a power factor meter.

• The power factor contr...read more

Different types of earthing include plate earthing, pipe earthing, rod earthing, strip earthing, and water pipe earthing.

• Plate earthing involves burying a plate made of copper or galvanized iron in the ground.

• Pipe earthing uses a pipe made of galvanized iron to provide a low-resistance path to the ground.

• Rod earthing involves driving a metal rod into the ground to provide a connection for earthing.

• Strip earthing uses a strip made of copper or galvanized iron buried in the gro...read more

Different types of transformers include power transformers, distribution transformers, instrument transformers, and autotransformers.

• Power transformers are used to step up or step down voltage for transmission and distribution.

• Distribution transformers are used to supply lower voltage to end-users.

• Instrument transformers are used for measuring voltage and current in high voltage systems.

• Autotransformers have a single winding with taps for varying voltage ratios.

Electrical load calculation is crucial for construction works to ensure proper electrical system design and prevent overloading.

• Determine the total connected load of all electrical equipment and appliances

• Calculate the demand load based on the expected usage of the equipment and appliances

• Consider diversity factors to account for the likelihood of all equipment being used simultaneously

• Add safety factors to ensure the electrical system can handle unexpected loads

• Examples of e...read more

The aluminum business involves the production, processing, and distribution of aluminum and its alloys.

• Aluminum is a lightweight and corrosion-resistant metal.

• It is widely used in various industries such as construction, transportation, packaging, and electrical.

• The aluminum industry includes mining and refining of bauxite ore, smelting, and fabrication processes.

• Major players in the aluminum business include companies like Alcoa, Rio Tinto, and Norsk Hydro.

• Aluminum products ...read more

OLTC (On Load Tap Changer) is a device used in transformers to regulate the voltage output by changing the number of turns in the transformer winding.

• OLTC is used to adjust the voltage output of a transformer while it is in operation.

• It works by changing the tap position on the transformer winding to increase or decrease the number of turns.

• This allows for voltage regulation without interrupting the power supply.

• OLTC can be operated manually or automatically based on the requ...read more

Transformers and generator protection and relay coordination study are important aspects of electrical management.

• Transformers protection involves measures to prevent damage to transformers from overloading, short circuits, and other faults.

• Generator protection involves measures to prevent damage to generators from overloading, short circuits, and other faults.

• Relay coordination study involves analyzing the performance of protective relays in a power system to ensure that the...read more

Protection of 132 KV switchyard involves various measures to ensure safety and reliability of the electrical system.

• Installation of protective devices such as circuit breakers, relays, and fuses to detect and isolate faults

• Implementation of grounding systems to prevent electrical shock and limit fault currents

• Regular maintenance and testing of protective equipment to ensure proper functioning

• Implementation of interlocking systems to prevent unauthorized access and ensure safe...read more

My current CTC is confidential.

• I prefer not to disclose my current CTC as it is confidential information.

• I am open to discussing my expected salary for this position.

• I believe my skills and experience make me a strong candidate for this role.

• I am willing to negotiate a fair compensation package based on the responsibilities and expectations of the position.

Protection of transformer involves using various devices and techniques to prevent damage and ensure safe operation.

• Use of overcurrent protection devices such as fuses and circuit breakers to prevent excessive current flow

• Installation of differential relays to detect internal faults and isolate the transformer

• Implementation of temperature monitoring systems to prevent overheating

• Regular maintenance and testing of protective devices to ensure proper functioning

• Ground fault pro...read more