SwitchGear Co. Trainee Electrical Engineer Interview Questions and Answers

Reasoning , mathematics

Q1. What is behaviour ?
Ans. 
Behaviour refers to the way in which a person or animal acts or conducts themselves in response to a particular situation or stimulus.
• Behaviour is influenced by genetics, environment, and past experiences.

• It can be observed and measured through actions, reactions, and responses.

• Behaviour can be categorized as either innate (instinctual) or learned.

• Examples of behaviour include aggression, shyness, curiosity, and friend
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Q2. What is the best method in power transfers?
Ans. 
The best method in power transfers is through high voltage transmission lines.
• High voltage transmission lines are more efficient in transferring power over long distances.

• Using transformers to step up the voltage before transmission and step down the voltage at the receiving end helps minimize power loss.

• HVDC (High Voltage Direct Current) transmission is another efficient method for long distance power transfers.

• Smart ...read more
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Q1. What is current
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Current is the flow of electric charge through a conductor.
• Current is measured in Amperes (A)

• It is the rate of flow of electric charge

• Current can be either direct current (DC) or alternating current (AC)

• Examples: A light bulb connected to a power source has current flowing through it

• In a circuit, current flows from the positive terminal of the voltage source to the negative terminal
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Q2. What are the method to convert in inverter
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Methods to convert inverter include pulse width modulation, sine wave modulation, and square wave modulation.
• Pulse width modulation (PWM) is a common method used to convert inverter signals by varying the width of the pulses.

• Sine wave modulation involves generating a sine wave signal to mimic the output of an inverter.

• Square wave modulation produces a square wave output by switching between high and low voltage levels.

• ...read more
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Q1. What is the transformer?
Ans. 
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
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Q2. What is the UPS?
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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
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Q3. What is MCB ?
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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
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Q4. Current and Voltage difference?
Ans. 
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.
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Q5. What is the CT AND PT?
Ans. 
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
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Q6. What is the last rating MCB hou to the amps
Ans. 
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.
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Q1. Asking for bms system
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Q2. Previous year experience
Ans. 
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
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Q1. Current (I) =voltage (V)/Resistance (R)
Ans. 
Ohm's Law states that current is equal to voltage divided by resistance.
• Ohm's Law is a fundamental principle in electrical engineering

• Current (I) is measured in Amperes (A)

• Voltage (V) is measured in Volts (V)

• Resistance (R) is measured in Ohms (Ω)

• The formula I = V/R can be used to calculate current in a circuit
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Q2. What it ohm's law
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Ohm's law states that the current flowing through a conductor between two points is directly proportional to the voltage across the two points.
• Ohm's law is represented by the equation V = IR, where V is voltage, I is current, and R is resistance.

• It is named after German physicist Georg Simon Ohm.

• Ohm's law is fundamental in the field of electrical engineering and is used to analyze and design electrical circuits.

• It help...read more
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Q3. SI unit of flux
Ans. 
Weber (Wb)
• The SI unit of flux is Weber (Wb)

• Flux is a measure of the flow of a physical quantity through a surface

• It is commonly used in electromagnetism and is defined as the amount of magnetic field passing through a surface
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Q4. Difference between AC and DC
Ans. 
AC stands for alternating current, which changes direction periodically, while DC stands for direct current, which flows in one direction.
• AC changes direction periodically, while DC flows in one direction constantly.

• AC is used in household appliances and power distribution, while DC is used in batteries and electronic devices.

• AC can be easily converted to different voltage levels using transformers, while DC requires m...read more
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Q5. How will you calculate current carrying in a conductor ?
Ans. 
Current carrying in a conductor can be calculated using Ohm's Law, which states that current (I) equals voltage (V) divided by resistance (R).
• Use Ohm's Law: I = V / R

• Determine the voltage across the conductor

• Find the resistance of the conductor

• Calculate the current flowing through the conductor using the formula
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Q1. If there Hazzard is occur so what should we do first
Ans. 
The first thing to do in case of a hazard is to ensure the safety of yourself and others.
• Assess the situation to determine the nature and extent of the hazard.

• Alert others in the vicinity about the hazard.

• Follow safety protocols and procedures to mitigate the hazard.

• Contact emergency services if necessary.

• Evacuate the area if instructed to do so.
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Q2. What should you do when their is no EV
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Q3. Also the DG suddenly stopped
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Q1. What should u do when dg fuel dosnot passess through a enjector
Ans. 
Check for clogs in the fuel line, inspect the injector for damage, clean or replace the injector if necessary.
• Inspect the fuel line for any clogs or blockages

• Check the injector for any damage or malfunction

• Clean the injector using appropriate tools and techniques

• If cleaning doesn't work, consider replacing the injector

• Ensure proper fuel flow and pressure to the injector
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Q2. How van we know earth leacage
Ans. 
Earth leakage can be detected using a residual current device (RCD) or ground fault circuit interrupter (GFCI).
• Earth leakage can be detected by measuring the difference in current between the live and neutral wires in a circuit.

• A residual current device (RCD) or ground fault circuit interrupter (GFCI) can be used to detect earth leakage and quickly disconnect the power supply to prevent electric shock.

• Regular testing o...read more
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Q1. Why are power transformer trip
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Q2. Test off transformer
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An aptitude test is a standardized assessment designed to measure an individual's cognitive abilities, skills, and potential in different areas.

1.We have to choose the topic
2.We have to gather our participants
3.Choose the right location
4.Obey the rules while discussion is going on
5.A guide must be there when G.D is going on

Q1. 1.How would you implement a distributed system that can handle a large number of requests?
Ans. 
A distributed system can handle a large number of requests by dividing the workload among multiple nodes.
• Use load balancing techniques to distribute requests evenly across nodes.

• Implement fault tolerance mechanisms to ensure system availability.

• Use message queues or event-driven architectures to handle asynchronous processing.

• Consider using caching mechanisms to improve performance.

• Implement horizontal scaling by addin...read more
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Q1. 3phase ac line voltage are not equal ?
Ans. 
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
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Q2. Stater on but motor not working ?
Ans. 
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
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