Vedanta Limited Electrical Maintenance Engineer Interview Questions and Answers

Verbal reasoning logical reasoning spatial ability

Q1. Basic electrical knowledge maintenance engineer knowledge and power plant knowledge
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Q2. Basic electrical engineer questions maintenance engineer questions and power plant questions
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Q3. Transformers related questions Buchholz really etc
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Q4. MCB contactor rectifier etc
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Normal question asked in aptitude test any one can crack it

Q1. Related your branch like what is motor, types, difference between induction motor or synchronous motor, transformer, starter, relay
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Q1. About yourself, your family background, strength & weekness, why you join in our company
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Q1. Basic Technical questions based on experience
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Q2. Technical questions to check basic concepts
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Q3. HR interview with negotiation
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Q1. Transformers maintenance
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Q2. Induction motor maintenance
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Q3. HT and lt panel maintenance
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Q4. VFD drive maintenance
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Q5. W/f RTD Thermo couple calibration
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Q6. Ster delta starter soft stater
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Q1. Countinue my interview
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Q2. Continue my interview
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Technical test, reasoning aptitude test

Q1. What is the full form VCB?
Ans. 
VCB stands for Vacuum Circuit Breaker.
• VCB is an electrical switch that uses vacuum as the arc quenching medium.

• It is used to protect electrical equipment from overloads and short circuits.

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

• They offer advantages such as high reliability, compact size, and low maintenance.

• Example: A VCB is installed in a substation to protect transformers and
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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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