JBM Group Electrical Technician Interview Questions and Answers

Q1. Dept oriented questions
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Q2. Genral , plc , utility , CNC Type questions
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Self Introduction and communication English

Q1. Transformer breaker related questions, AC/DC Motors starters, Hardware circuits and PLC logics relay consupt , injuction moulding related questions
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Q1. Intro yourself Qualifications Work detail
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Q1. What is a synchronisation panel for DG?
Ans. 
A synchronisation panel for DG is used to synchronize multiple generators to ensure they are running in parallel and sharing the load evenly.
• Synchronisation panels are used in situations where multiple diesel generators need to be connected in parallel to supply power to a common bus.

• The panel monitors the frequency, voltage, and phase angle of each generator and ensures they are synchronized before connecting them to ...read more
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Q2. What is Pulse width in laser ?
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Pulse width in laser refers to the duration of time that a laser beam is emitted.
• Pulse width is measured in seconds or milliseconds.

• It determines the amount of energy delivered by the laser beam.

• Shorter pulse widths are often used for precision cutting or welding.

• Longer pulse widths are used for applications like material processing or drilling.
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Q3. What is BDV of Transformer oil?
Ans. 
BDV stands for Breakdown Voltage. It is a measure of the dielectric strength of transformer oil.
• BDV is the voltage at which the insulation between two conductors breaks down.

• It is an important parameter to determine the quality of transformer oil.

• BDV is usually measured in kilovolts (kV).

• Higher BDV indicates better quality and higher dielectric strength of the oil.
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Q4. How RTCC panel works?
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RTCC panel stands for Remote Tap Changing Control panel, used in power transformers to automatically adjust the voltage ratio.
• RTCC panel monitors the load and voltage levels of the transformer.

• It automatically adjusts the tap changer to maintain the desired voltage ratio.

• RTCC panel can be programmed to operate based on specific parameters like load current, temperature, etc.

• It helps in optimizing the transformer perfor...read more
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Q1. About background , why you leave from previous company, why you want to join our company.
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Q1. PLC
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Q1. Difference between AC & DC current?
Ans. 
AC current changes direction periodically while DC current flows in one direction only.
• AC current is used in household appliances and power grids while DC current is used in batteries and electronic devices.

• AC current can be easily transformed into different voltage levels using transformers while DC current requires a converter.

• AC current is more dangerous to humans than DC current due to its ability to cause muscle c...read more
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Q2. What is transformer?
Ans. 
A transformer is an electrical device that transfers electrical energy from one circuit to another 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, wrapped around a magnetic core.

• When an alternating current flows through the primary coil, it creates a magnetic field that indu...read more
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