Dusters Total Solutions Services Electrical Engineer Interview Questions and Answers

Q1. Overall previous site infrastructure details
Ans. 
Previous site infrastructure included data centers, networking equipment, servers, and storage systems.
• Data centers were located in multiple regions for redundancy.

• Networking equipment included routers, switches, and firewalls.

• Servers were a mix of physical and virtual machines.

• Storage systems used SAN and NAS technologies.

• Backup and disaster recovery plans were in place.

• Monitoring tools were used to track performance ...read more
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Multiple scenarios of UPS DG CHILLER FAILURES

Q1. Maintenance engineer
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Q2. Facility management, inventory, MMR, DSR, DMR
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Q1. Only facility maintenance
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Q2. Electrical, plumbing, HVAC, civil
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Q1. Technical questions
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Q1. Self introduction
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Q2. Hobbies
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Q1. What is the procedure for conducting a breakdown voltage test?
Ans. 
A breakdown voltage test assesses the insulation strength of electrical components by applying high voltage until failure occurs.
• 1. Prepare the test setup: Ensure all equipment is calibrated and safe for high voltage testing.

• 2. Select the component: Choose the electrical device or insulation material to be tested.

• 3. Apply voltage gradually: Increase the voltage slowly to avoid sudden breakdowns, monitoring the current.

• ...read more
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Q2. What is the vector group test?
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The vector group test determines the phase relationship and connection type of transformers.
• Identifies the phase displacement between primary and secondary windings.

• Common vector groups include Yd11, Yy0, and Δy5.

• Used to ensure compatibility in parallel operation of transformers.

• Helps in understanding the neutral grounding and fault current paths.
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Q3. What is the insulation resistance (IR) test in a transformer?
Ans. 
The insulation resistance test measures the resistance of a transformer's insulation to ensure safety and performance.
• Insulation resistance is measured in ohms, indicating the quality of insulation.

• A common test voltage is 500V or 1000V DC, depending on the transformer rating.

• A high IR value (typically > 1 MΩ) indicates good insulation; low values suggest potential insulation failure.

• The test helps prevent electrica...read more
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Q4. What is the turn ratio test?
Ans. 
The turn ratio test measures the voltage transformation ratio of a transformer to ensure proper operation and efficiency.
• It compares the primary and secondary winding turns of a transformer.

• A typical turn ratio might be 10:1, meaning 10 turns on the primary for every 1 on the secondary.

• The test helps identify issues like shorted turns or incorrect winding connections.

• For example, if a transformer is rated for 240V/120V...read more
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Q5. What are the phase-to-phase angle and phase-to-neutral angle?
Ans. 
Phase-to-phase angle is the angle between two phases, while phase-to-neutral angle is the angle between a phase and neutral.
• In a three-phase system, the phase-to-phase angle is typically 120 degrees apart.

• For example, in a balanced three-phase system, the voltage between any two phases (e.g., A and B) is 120 degrees.

• The phase-to-neutral angle is 0 degrees for the neutral phase and varies for other phases.

• In a star conn...read more
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Q1. Why job thik Electrical filed
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Q2. What this work electrical engineering
Ans. 
Electrical engineering involves the study and application of electricity, electronics, and electromagnetism in various technologies.
• Designing electrical circuits for devices like smartphones and computers.

• Developing power generation systems, such as solar panels and wind turbines.

• Working on control systems for automation in manufacturing processes.

• Creating communication systems, including satellite and wireless technol...read more
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Q3. Total Experience this field
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Q1. Transformer,chillers dg set cooling towers etc
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Q2. Utility maintenance documents
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Q1. Why use in bukolze relay
Ans. Bukolze relay use in Transformer production
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Q2. Why use in ct and pt
Ans. 
CT and PT are used in electrical engineering for measurement and protection purposes.
• CT (Current Transformer) is used to measure high currents and step them down to a level suitable for measurement instruments.

• PT (Potential Transformer) is used to measure high voltages and step them down to a level suitable for measurement instruments.

• CTs and PTs are also used for protection purposes, such as detecting faults and isola...read more
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Q3. How many Transformer production
Ans. 
The number of transformer production varies depending on the company and market demand.
• The number of transformer production is influenced by factors such as market demand, company size, and production capacity.

• Large transformer manufacturers may produce thousands of transformers per year.

• Smaller companies or custom transformer manufacturers may have lower production volumes.

• The production volume can also vary based on ...read more
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Q4. How many type of breakers
Ans. Type off breakers, MCB, mccb, elcb, rcbo, ACB , VCB , OCB, sf6,...etc
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