Cospharma Speciality Ingredients Executive Electrical Maintenance Interview Questions, Process, and Tips

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Q1. What is the role of a breather in a transformer?
Ans. 
A breather in a transformer helps to prevent moisture and dust from entering the transformer, thus maintaining the insulation properties and extending the lifespan of the transformer.
• Prevents moisture and dust from entering the transformer

• Helps maintain insulation properties

• Extends the lifespan of the transformer
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Q2. What is the role of an expansion tank in a transformer?
Ans. 
An expansion tank in a transformer helps to compensate for changes in the volume of the insulating oil due to temperature variations.
• Compensates for changes in oil volume caused by temperature fluctuations

• Prevents damage to the transformer due to excessive pressure build-up

• Helps maintain a constant oil level in the transformer

• Allows for expansion and contraction of the oil without affecting the transformer's operation
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Q3. Why is a star-delta motor used
Ans. 
Star-delta motors are used to reduce starting current and torque in high-power applications.
• Reduces starting current by starting the motor in star configuration and then switching to delta configuration once up to speed

• Reduces starting torque to prevent mechanical stress on the motor and connected equipment

• Commonly used in high-power applications like industrial pumps, compressors, and fans
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Q4. What does "synchronize" for diesel generators
Ans. 
Synchronizing diesel generators involves matching the speed and phase of multiple generators before connecting them to a common electrical bus.
• Synchronization ensures that the generators are running at the same speed and phase to prevent damage when connected together.

• This process involves adjusting the speed and phase of the generators using specialized equipment.

• Once synchronized, the generators can be connected in p...read more
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Q5. What is make vfd transformer ACB and vcp and this capacity
Ans. 
VFD stands for Variable Frequency Drive, ACB stands for Air Circuit Breaker, and VCP stands for Vacuum Circuit Breaker. They are used in electrical systems for controlling and protecting equipment.
• VFD (Variable Frequency Drive) is used to control the speed of an AC motor by varying the frequency and voltage supplied to the motor.

• ACB (Air Circuit Breaker) is a type of circuit breaker that operates in the air as the arc ...read more
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Q6. Full form CT, PT, MCB, MCCB, ACB, VCB, MD, SSR,
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