ONGC Energy Centre Electrical Maintenance Engineer Interview Questions and Answers

Apitude round was conducted

Q1. Losses in transformer
Ans. 
Losses in transformer refer to energy losses that occur during the conversion of electrical energy from one voltage level to another.
• There are two main types of losses in transformers: copper losses and iron losses.

• Copper losses occur due to the resistance of the copper windings and are also known as I^2R losses.

• Iron losses, also known as core losses, occur due to hysteresis and eddy current losses in the transformer c...read more
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Q2. Power factor significance
Ans. 
Power factor is the ratio of real power to apparent power in an electrical system, indicating the efficiency of power usage.
• Power factor is important for measuring the efficiency of electrical systems.

• A high power factor indicates efficient power usage, while a low power factor indicates wastage.

• Improving power factor can reduce electricity costs and increase system capacity.

• Power factor correction devices like capacit...read more
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Q1. Difference between induction motor and synchronous motor
Ans. 
Induction motor operates on the principle of electromagnetic induction, while synchronous motor operates at a constant speed determined by the frequency of the power supply.
• Induction motor does not require any external excitation to run, while synchronous motor requires a separate DC power source for excitation.

• Induction motor has a slightly lower efficiency compared to synchronous motor.

• Synchronous motor is used in ap...read more
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Q2. Switchgear , types and working
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Q3. Transformer parts and use
Ans. 
Transformer parts include core, windings, and insulation. It is used to step up or step down voltage in electrical systems.
• Transformer parts: core, windings, insulation

• Core: provides magnetic path for flux

• Windings: primary and secondary coils

• Insulation: prevents short circuits

• Used to step up or step down voltage in electrical systems
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Q1. Detail about your current job profile
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Q2. Iec standards for every electrical installations
Ans. 
IEC standards are guidelines for electrical installations to ensure safety and efficiency.
• IEC 60364 is the main standard for electrical installations in buildings

• IEC 60079 provides guidelines for electrical installations in hazardous areas

• IEC 61892 provides guidelines for electrical installations on offshore structures

• IEC 61439 provides guidelines for low-voltage switchgear and control gear assemblies

• Adherence to IEC s...read more
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Q1. Why you want to leave current company
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