Rattha Group of Companies Electrical Supervisor Interview Questions and Answers

Q1. What is LRS mantinenc and troubleshooting
Ans. 
LRS maintenance and troubleshooting involves the regular upkeep and identification of issues in electrical systems.
• LRS stands for Low Resistance System, which is used to control and protect electrical equipment.

• Maintenance of LRS includes regular inspections, cleaning, and testing of components to ensure proper functioning.

• Troubleshooting involves identifying and resolving issues such as faulty connections, damaged com...read more
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Q2. What is GRR mantinenc and troubleshooting
Ans. 
GRR maintenance and troubleshooting refers to the process of ensuring the proper functioning and resolving issues related to GRR systems.
• GRR stands for Grounding, Resistance, and Reactance.

• Maintenance involves regular inspections, testing, and repairs to ensure the system is functioning optimally.

• Troubleshooting involves identifying and resolving any issues or malfunctions in the GRR system.

• Examples of troubleshooting ...read more
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Q1. A 22 kw AOP motor CT cable burn again and again what is the reason ?
Ans. 
The repeated burning of a 22 kW AOP motor CT cable may be due to overloading, short circuits, poor insulation, or incorrect cable sizing.
• Check for overloading of the motor causing excessive heat in the cable

• Inspect for short circuits in the motor or the wiring

• Ensure proper insulation of the cable to prevent overheating

• Verify if the cable size is appropriate for the motor's power requirements
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Q2. When CT of AOP motor is bypassed then what effect on the motor ?
Ans. 
Bypassing the CT of an AOP motor can lead to overcurrent and damage to the motor.
• Bypassing the CT can result in the motor drawing excessive current.

• This can lead to overheating of the motor windings.

• Overcurrent can cause damage to the motor components.

• It can also pose a safety risk due to potential electrical faults.
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Q1. What is the teransform
Ans. 
A transformer is a device that transfers electrical energy between two or more circuits through electromagnetic induction.
• Transformers are commonly used to step up or step down voltage levels in electrical systems.

• They consist of two coils of wire, known as the primary and secondary coils, wrapped around a core.

• The primary coil is connected to the input voltage source, while the secondary coil is connected to the outpu...read more
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Q2. What is the current
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Q3. What is the voltage
Ans. 
Voltage is the difference in electric potential between two points.
• Voltage is measured in volts (V).

• It represents the potential energy per unit charge.

• Voltage is the driving force that pushes electric current through a circuit.
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Q4. What is the ohm's low
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Ohm's Law states that the current flowing through a conductor is directly proportional to the voltage applied across it, and inversely proportional to the resistance of the conductor.
• Ohm's Law is represented by the formula V = IR, where V is the voltage, I is the current, and R is the resistance.

• It helps in calculating the current flowing through a circuit when the voltage and resistance are known, or determining the r...read more
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Q1. About previous company
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Q2. Experience discussion
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Q1. If any electrical issue how to resolve.
Ans. 
To resolve an electrical issue, identify the problem, troubleshoot, and implement appropriate solutions.
• Identify the specific electrical issue

• Inspect the affected equipment or circuit

• Check for loose connections or damaged components

• Use appropriate testing equipment to diagnose the problem

• Troubleshoot by following electrical diagrams or manuals

• Implement necessary repairs or replacements

• Ensure proper safety measures are ...read more
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Q1. What. Is. Power system
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Power system is a network of electrical components used to generate, transmit, and distribute electrical power.
• Power system is a network of power generation plants, transmission lines, substations, and distribution networks.

• It involves the generation of electrical power from various sources such as coal, natural gas, hydro, wind, or solar.

• The generated power is then transmitted over long distances through high-voltage ...read more
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Q2. Factor effect. Of. Power
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Factors that affect power in electrical systems.
• Resistance: higher resistance leads to lower power

• Voltage: higher voltage leads to higher power

• Current: higher current leads to higher power

• Power factor: lower power factor leads to lower power

• Load: heavier load leads to higher power consumption

• Temperature: higher temperature leads to lower power

• Frequency: higher frequency leads to higher power

• Wire size: smaller wire size...read more
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Q1. Electrical engineering related questions
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Q1. Tell me about yourself.
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Q1. What is the synchronisation process of plant ?
Ans. 
Synchronisation process of a plant involves matching the frequency, voltage, and phase angle of the incoming generator with the grid.
• Ensure the generator frequency matches the grid frequency (50Hz or 60Hz).

• Match the voltage levels of the generator with the grid.

• Adjust the phase angle of the generator to synchronize with the grid.

• Use synchronizing equipment like synchroscope or synchronizing lamps to ensure proper synch...read more
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Q2. Brief discussion about alternator and transformer protection system ?
Ans. 
Alternator and transformer protection systems are essential for preventing damage and ensuring safe operation.
• Alternator protection systems typically include overcurrent, overvoltage, and reverse power protection to safeguard the alternator from damage.

• Transformer protection systems often involve differential protection, overcurrent protection, and temperature monitoring to prevent overheating and insulation breakdown.

• ...read more
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