R R GROUP Electrical Maintenance Engineer Interview Questions, Process, and Tips

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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Q1. What is transformer?
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A transformer is an electrical device that transfers electrical energy between two or more circuits through electromagnetic induction.
• Transformers are used to increase or decrease the voltage in electrical power transmission and distribution systems.

• They consist of two or more coils of wire, known as windings, which are wound around a core made of magnetic material.

• The primary winding receives electrical energy from th...read more
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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
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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
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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. Give me any device for maintenance.
Ans. 
Vibration Analyzer
• Used to detect and diagnose machinery faults by measuring vibration levels

• Helps in identifying the root cause of the problem and preventing breakdowns

• Examples: SKF Microlog, Emerson CSI 2140, Fluke 810
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