Top 40 DEWA Electrical Engineer Exam Questions – Complete Guide
The Dubai Electricity and Water Authority (DEWA) is one of the most reputable utility providers in the Middle East. If you are planning to work as an electrical engineer in Dubai, passing the DEWA electrical engineer exam is essential. This test checks your technical knowledge, design understanding, and safety awareness. Many candidates fail because they underestimate the depth of technical concepts covered in the exam.
Table of Contents
Table of Contents
Preparing for the exam requires focus on core subjects like electrical machines, power systems, protection systems, earthing, and DEWA-specific regulations. These topics ensure compliance with international standards and DEWA’s strict safety codes. The exam is not just about theory; it often includes real-world scenarios and calculations, making practice a key factor in success.
Before diving into the questions, remember that a strong grip on fundamentals, short formulas, and DEWA guidelines will help you clear the exam easily. To make your preparation easier, we have compiled 40 important DEWA electrical engineer exam questions with short, clear answers.
Key Takeaways
- The DEWA electrical engineer exam focuses on power systems, protection, electrical machines, cables, and DEWA safety rules.
- Practice short questions and answers for quick revision before the test.
- Real-world scenario-based questions are common, so understanding practical applications is crucial.
- Stay updated with DEWA standards and IEC regulations for a better score.
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Why DEWA Electrical Engineer Exam Questions Matter
DEWA projects follow strict quality and safety measures. The electrical engineer exam ensures that only qualified professionals handle electrical systems in Dubai. These questions reflect the standard expected in large-scale projects like substations, distribution networks, and renewable energy plants. Preparing with these DEWA electrical engineer exam questions will give you an edge in the actual test.
Top 40 DEWA Electrical Engineer Exam Questions and Answers
Below are 40 frequently asked DEWA electrical engineer exam questions along with concise answers. They cover technical theory, practical scenarios, and safety standards.
1. What is the standard frequency in UAE?
Answer: 50 Hz according to IEC standards.
2. What is the nominal voltage level in DEWA LV network?
Answer: 400V three-phase and 230V single-phase.
3. What is the fault level for 11kV DEWA distribution network?
Answer: Typically 25 kA for 3 seconds.
4. State the formula for three-phase power calculation.
Answer: P = √3 × V × I × cos φ.
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5. What is the minimum insulation resistance for 11kV cable as per DEWA?
Answer: Greater than 1 GΩ for one minute at 5kV megger test.
6. Which earthing system is used in DEWA LV networks?
Answer: TN-S system for distribution.
7. Define diversity factor.
Answer: Ratio of sum of individual maximum demands to maximum demand on the system.
8. What is the standard frequency tolerance in UAE?
Answer: ±1% of 50 Hz.
9. What protection is used for transformer differential?
Answer: Percentage differential relay.
10. What is the short circuit rating of DEWA LV panels?
Answer: 50kA for 1 second as per DEWA specifications.
11. Why is neutral grounding important?
Answer: To stabilize system voltage and enable fault protection.
12. What is the minimum depth for LV cable laying?
Answer: 750 mm from ground level as per DEWA rules.
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13. What is the formula for cable voltage drop?
Answer: Vd = (√3 × I × L × R cos φ + X sin φ) / 1000.
14. What is the permissible voltage drop in LV network as per DEWA?
Answer: Maximum 3% for lighting and 5% for other loads.
15. Which standard does DEWA follow for electrical installations?
Answer: IEC and BS standards.
16. How is earth fault current limited in DEWA system?
Answer: Through proper earthing and neutral grounding system.
17. What is the function of Buchholz relay?
Answer: Detects internal faults in oil-filled transformers.
18. What is the required insulation resistance for LV wiring?
Answer: Minimum 1 MΩ at 500V megger test.
19. Define power factor.
Answer: Ratio of real power to apparent power in the system.
20. What is the standard operating voltage for DEWA MV network?
Answer: 11kV and 33kV.
21. What is the role of CTs in protection?
Answer: Provide scaled-down current for protective relays and metering.
22. How is arc flash hazard reduced?
Answer: Using arc-resistant panels, PPE, and fast tripping protection.
23. What is the recommended soil resistivity for earthing in DEWA?
Answer: Less than 1 ohm for substations.
24. Which type of circuit breaker is used in 11kV systems?
Answer: Vacuum circuit breaker (VCB).
25. Why is cable derating applied?
Answer: To account for ambient temperature, grouping, and soil conditions.
26. What is the function of OLTC in transformers?
Answer: Adjust secondary voltage under load by changing tap position.
27. What is the minimum clearance for 11kV overhead lines from ground?
Answer: 5.8 meters as per DEWA standards.
28. What is the typical efficiency of distribution transformer?
Answer: 98% at full load.
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29. What protection is provided for capacitor banks?
Answer: Overcurrent and unbalanced protection.
30. What is the formula for short circuit current?
Answer: I = MVA / (√3 × kV).
31. Why is lightning protection important?
Answer: To protect structures and equipment from overvoltage surges.
32. What are the main DEWA cable color codes for LV circuits?
Answer: Red, Yellow, Blue for phases; Black for neutral; Green/Yellow for earth.
33. What is the difference between star and delta connection?
Answer: Star provides neutral point and lower phase voltage, delta does not.
34. What type of earthing electrode does DEWA prefer?
Answer: Copper earth rods with proper bonding.
35. Define step and touch potential.
Answer: Voltage difference experienced by a person during ground faults.
36. Why is capacitor bank used in LV panels?
Answer: For power factor improvement.
37. What is the minimum size of earth conductor in LV network?
Answer: 16mm² copper as per DEWA.
38. Why is SCADA system important for DEWA operations?
Answer: For remote monitoring and control of the electrical network.
39. What is the allowable harmonic distortion as per DEWA?
Answer: THD less than 5%.
40. Why is standby generator neutral earthed?
Answer: For fault detection and safety during operation.
Technical Insights for DEWA Electrical Engineer Exam
These DEWA electrical engineer exam questions are based on practical scenarios and IEC standards that DEWA follows. Here are some insights:
- Power System Protection: Understand relays like overcurrent, differential, and earth fault.
- Cable Sizing: Learn to calculate current capacity, voltage drop, and derating.
- Earthing: Study TN-S system, soil resistivity, and bonding requirements.
- Load Calculations: Know diversity factor, demand factor, and fault current calculations.
- Safety: DEWA emphasizes arc flash prevention and lockout-tagout procedures.
A good strategy is to prepare short notes on formulas and DEWA regulations. Practice numerical questions daily to increase speed and accuracy.
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Why Practice Helps in Passing DEWA Exam
The exam duration is limited, and questions often require quick calculation. Practicing these DEWA electrical engineer exam questions will help you recall formulas instantly. Also, keep updated with DEWA Electrical Safety Rules and Construction Specifications for Electrical Works.
Final Tips
- Revise transformer, protection, and cable sizing thoroughly.
- Keep your notes short and formula-based.
- Use DEWA-approved design standards during study.
By following these guidelines and practicing the above questions, you can confidently attempt the DEWA electrical engineer exam.
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