Bharat Aluminium Company (BALCO) Electrical Engineer Interview Questions and Answers

Q1. Dol and star delta wiring scheme
Ans. 
DOL (Direct-On-Line) and star delta are two different wiring schemes used in electrical engineering for starting induction motors.
• DOL wiring directly connects the motor to the power supply for starting, while star delta wiring initially starts the motor in star configuration and then switches to delta configuration for running.

• DOL wiring is simpler and cheaper but causes high starting current, while star delta wiring r...read more
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Q1. I am working from Grid sub station . Transformer... CT PT CVT EARTHING PTW
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Q2. All about 132 kv Gss
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Hard work versus smart work.

Q1. Why power plug earth wire is bigger in size?
Ans. 
The power plug earth wire is bigger in size to ensure safety and prevent electrical shocks.
• The earth wire provides a path for the current to flow in case of a fault or short circuit.

• A larger wire size reduces resistance and allows for the safe dissipation of excess current.

• It helps to protect individuals and equipment from electric shock hazards.

• The earth wire is connected to the ground, which acts as a reference point...read more
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Q2. Which conductor of same size will take larger current Al or Cu?
Ans. 
Copper (Cu) conductor will take larger current than Aluminum (Al) conductor of the same size.
• Copper has a higher electrical conductivity than Aluminum.

• Copper has a lower resistivity than Aluminum.

• Copper has better thermal conductivity than Aluminum.

• Copper is more commonly used in high-current applications.

• Aluminum is often used in overhead power transmission lines due to its lighter weight.
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Q3. What is pulse width modulation in VFD?
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Pulse width modulation (PWM) is a technique used in VFD to control the speed of the motor by adjusting the width of the pulses of voltage supplied to the motor.
• PWM is a method of controlling the amount of power delivered to a load without changing the voltage level.

• In VFD, PWM is used to control the speed of the motor by varying the width of the pulses of voltage supplied to the motor.

• The width of the pulses is control...read more
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Q1. Tranformar testing
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Q2. HT.LTBreaker testing and maintenance
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Q3. HT LT motar testing and maintenance
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Q4. CT testing and maintenance
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Q5. PT testing and maintenance
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Q1. 1.What is the input value of LT panel?
Ans. 
The input value of an LT panel is the electrical power supply provided to the panel.
• The input value of an LT panel is typically the voltage and current supplied by the electrical utility.

• It can be AC (alternating current) or DC (direct current) depending on the application.

• The input value may vary depending on the specific requirements of the electrical system.

• For example, in a residential building, the input value of ...read more
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Q2. 2.What is the full form of PPE 's?
Ans. 
PPE stands for Personal Protective Equipment.
• PPE is equipment worn to minimize exposure to hazards that may cause serious workplace injuries or illnesses.

• Examples of PPE include safety glasses, gloves, hard hats, respirators, and earplugs.

• Employers are responsible for providing PPE to their employees and ensuring that it is properly used and maintained.

• Employees must also be trained on how to properly use and care for
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Q3. Personal protective equipments
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Q4. 3.Resistance are measured in
Ans. 
Resistance is measured in ohms.
• Resistance is a property of an electrical component or material that opposes the flow of electric current.

• The unit of measurement for resistance is the ohm (Ω).

• Resistance can be measured using a multimeter or an ohmmeter.

• For example, a resistor with a resistance value of 100 ohms would be written as 100Ω.
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Work should be completely done in given time

Q1. Related to work done in my current organisation, plc programming, instrumentation work related like RTD & thermocouple , electrical machines, transformers , motor and VVVF drives .
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Q2. Vvvf drives working , siemens plc .
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Q1. Background and family related.
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