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JCB Electrical Engineer Interview Questions and Answers

Updated 5 Feb 2024

Q1. Which side connected to OLTC in transformer

Ans.

The OLTC (On-Load Tap Changer) in a transformer is typically connected to the high voltage side.

  • OLTC is connected to the high voltage winding of the transformer

  • It allows for tap changing while the transformer is energized

  • The low voltage side remains fixed while the high voltage side can be adjusted

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Q2. Why use in ten delta test in transformer ?

Ans.

Ten delta test is used to detect winding deformation and shorted turns in transformer.

  • Detects winding deformation and shorted turns

  • Helps in identifying internal faults

  • Used for routine maintenance and troubleshooting

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Q3. Why use in bukolze relay

Ans.

Bukolze relays are used in electrical engineering for their high reliability and ability to handle high voltage and current.

  • Bukolze relays are known for their robustness and durability.

  • They are commonly used in power distribution systems and industrial applications.

  • These relays can handle high voltage and current levels, making them suitable for heavy-duty operations.

  • They provide reliable switching and protection in electrical circuits.

  • Bukolze relays are designed to withstand...read more

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Q4. UV Coil give a protection over voltage and under voltage

Ans.

UV Coil provides protection against over voltage and under voltage.

  • UV Coil is a device used in electrical systems to protect against voltage fluctuations.

  • It monitors the voltage levels and activates when the voltage exceeds or falls below the specified limits.

  • When the voltage exceeds the upper limit, the UV Coil disconnects the power supply to prevent damage to the equipment.

  • Similarly, when the voltage falls below the lower limit, the UV Coil interrupts the power supply to av...read more

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Q5. Why use explolation went in tranformer ?

Ans.

Explosion vent in transformer is used for safety purposes.

  • It helps to release pressure build-up inside the transformer due to internal faults or external factors.

  • It prevents the transformer from exploding and causing damage to the surrounding area.

  • The vent is designed to open at a specific pressure level to ensure safe release of gases.

  • It is a mandatory safety feature in transformers as per industry standards.

  • Examples of external factors that can cause pressure build-up inclu...read more

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Q6. OLTC always connected in HT voltage side

Ans.

Yes, OLTC is always connected in the HT voltage side.

  • OLTC stands for On-Load Tap Changer.

  • It is a device used in electrical power transformers to regulate the voltage level.

  • OLTC is typically connected on the high voltage (HT) side of the transformer.

  • It allows for tap changing while the transformer is energized and under load.

  • By changing the tap position, the OLTC can adjust the transformer's output voltage.

  • This helps to compensate for variations in the input voltage or load co...read more

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Q7. Why use in star delta

Ans.

Star delta is used in electrical engineering to reduce starting current and protect motors.

  • Star delta connection is used for induction motors.

  • It reduces the starting current by a factor of √3.

  • It helps in reducing voltage drop during motor starting.

  • It protects the motor from excessive current and overheating.

  • It is commonly used in applications where the motor needs to start with a low current.

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Q8. What is the working of UV coil

Ans.

UV coil is a component used in HVAC systems to disinfect air by emitting ultraviolet light.

  • UV coil is installed in the air handling unit of HVAC systems.

  • It emits ultraviolet light to kill or deactivate microorganisms like bacteria, viruses, and mold spores.

  • UV light damages the DNA and RNA of these microorganisms, preventing them from reproducing.

  • UV coil helps improve indoor air quality by reducing the presence of harmful pathogens.

  • Regular maintenance and cleaning of UV coil a...read more

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Q9. Why used star delta starter

Ans.

Star delta starter is used to reduce the starting current of induction motors.

  • Reduces the starting current of induction motors

  • Prevents excessive voltage drop in the power supply

  • Protects the motor windings from overheating

  • Allows for smooth and controlled motor starting

  • Commonly used in applications where high starting torque is not required

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