ELECTRICAL SUPERVISOR PAPER 3 MCQS PART 3 JAN 2023

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PAPER 3 - INSTALLATION TESTING AND MAINTENANCE OF ELECTRICAL INSTALLATIONS / विद्युत संस्थापनाओं की संस्थापना परीक्षण तथा उनका अनुरक्षण
Electrical Engineering Quiz

Electrical Engineering Quiz

This quiz contains 24 questions about electrical engineering concepts. Each correct answer scores 1 mark, while each wrong answer deducts 0.25 marks. Unanswered questions don't affect your score.

Note: Feedback will appear immediately after selecting an option, and full explanations will be shown after submitting the quiz.

1. An Earth-leakage circuit breaker (ELCB) is a safety device used in electrical installations like




✓ Correct!
✗ Incorrect!
Correct answer: All of these. ELCBs are used in all types of electrical installations - residential, commercial, and industrial - to protect against earth leakage currents.

2. "These / this type of transformers scale the large values of voltage or current to small, standardized values can be classified as"




✓ Correct!
✗ Incorrect!
Correct answer: Instrument transformer (CTs & PTs are types of instrument transformers). Instrument transformers are specifically designed to scale down high voltages or currents to measurable levels for instruments and protective relays.

3. This transformer presents a negligible load to the primary circuit




✓ Correct!
✗ Incorrect!
Correct answer: CT (Current Transformer). CTs minimize load impact on primary circuits by being designed to appear as nearly a short circuit to the primary while providing a reduced current to the secondary.

4. Passive solar techniques include




✓ Correct!
✗ Incorrect!
Correct answer: All of these. Passive solar techniques encompass building orientation, thermal mass materials, and natural ventilation to maximize solar gain and minimize energy use.

5. Power transformers convert power-level voltages from one phase configuration to




✓ Correct!
✗ Incorrect!
Correct answer: Another phase (e.g., 3-phase to single-phase or voltage level changes). Power transformers handle phase configuration changes and voltage level conversions in power systems.

6. Power transformers can include features for




✓ Correct!
✗ Incorrect!
Correct answer: All of these. Power transformers serve multiple purposes including isolation, distribution, and control in electrical power systems.

7. Distribution transformers are pole-type transformers that




✓ Correct!
✗ Incorrect!
Correct answer: A, B, and C. Distribution transformers come in pole-mounted and plinth-mounted varieties, supplying small to medium power amounts for residential and commercial use.

8. Transformers transfer energy from one circuit to another by




✓ Correct!
✗ Incorrect!
Correct answer: Electromagnetic induction (Faraday's Law). Transformers work through mutual induction between windings, not electrostatic effects.

9. Industrial control transformers are designed for industrial applications that require




✓ Correct!
✗ Incorrect!
Correct answer: All of these. Industrial control transformers power various electromagnetic control devices including relays, solenoids, and contactors in industrial settings.

10. Industrial control transformers are well-suited for applications that require




✓ Correct!
✗ Incorrect!
Correct answer: Constant voltage with low VA (Common for control circuits). Control transformers maintain steady voltage for control circuits with relatively low power requirements.

11. Isolation transformers provide




✓ Correct!
✗ Incorrect!
Correct answer: Both A and B. Isolation transformers provide both electrical decoupling and physical isolation between primary and secondary circuits for safety and noise reduction.

12. Isolation transformers have a turn ratio of




✓ Correct!
✗ Incorrect!
Correct answer: 1:1 (Equal input/output voltage for isolation). True isolation transformers typically have a 1:1 ratio, maintaining the same voltage while providing galvanic isolation.

13. Magnetic field




✓ Correct!
✗ Incorrect!
Correct answer: All of these. Magnetic fields exist independently of any medium, propagating through vacuum, air, and other materials.

14. The energy-storing capacity of the magnetic field is




✓ Correct!
✗ Incorrect!
Correct answer: Cannot be compared (Depends on application; both store energy differently). The energy storage capabilities depend on the specific application and configuration - they store energy in fundamentally different ways.

15. Permanent magnets have their own




✓ Correct!
✗ Incorrect!
Correct answer: A and B. Permanent magnets inherently possess magnetism and are typically made from ferromagnetic materials like iron, nickel, or cobalt alloys.

16. Which statement is/are correct?
1. Monopoles do not exist for magnetic fields
2. Electric fields allow isolated charges




✓ Correct!
✗ Incorrect!
Correct answer: 1 and 2 (Both are fundamental truths in electromagnetism). Magnetic monopoles don't exist (always dipoles), while electric monopoles (isolated charges) do exist.

17. A rotating magnetic field rotates with synchronous speed in machines like




✓ Correct!
✗ Incorrect!
Correct answer: Both (Both use rotating magnetic fields). Both synchronous and induction motors utilize rotating magnetic fields, though they interact with the rotor differently.

18. "Most common materials commercially used as semiconductors are 1. Germanium (Ge) 2. Silicon (Si)"




✓ Correct!
✗ Incorrect!
Correct answer: Both (Si is dominant; Ge is used in niche applications). Silicon dominates modern electronics, while germanium finds use in specialized applications like infrared optics and high-frequency devices.

19. Semiconductors show




✓ Correct!
✗ Incorrect!
Correct answer: Negative temperature coefficient of resistivity (Resistance decreases with temperature). As temperature increases, more charge carriers are liberated in semiconductors, decreasing resistivity.

20. "Supervisory Control and Data Acquisition (SCADA) is"




✓ Correct!
✗ Incorrect!
Correct answer: All of these. SCADA systems integrate all these components for industrial process monitoring and control across various industries.

21. Applications of plate-type earthing are




✓ Correct!
✗ Incorrect!
Correct answer: All of these. Plate earthing is versatile, used in telecom towers, transmission systems, and for neutral earthing in various electrical installations.

22. Pipe earthing is better than other types because




✓ Correct!
✗ Incorrect!
Correct answer: A and B. Pipe earthing offers higher current handling capacity and more durable connections compared to plate or rod earthing methods.

23. "Which statement is/are correct?"
1. Earthing avoids electric shocks
2. Grounding balances overloads
3. Earthing connects equipment to underground pits




✓ Correct!
✗ Incorrect!
Correct answer: All of these. Earthing provides shock protection, helps balance currents (though doesn't prevent overloading), and physically connects to ground electrodes/pits.

24. "For the earthing wire, which statement is not correct?"




✓ Correct!
✗ Incorrect!
Correct answer: "Avoids live wire overloading" (Incorrect: Grounding doesn't prevent overloading; it diverts faults). Earthing provides safety against faults but doesn't affect normal circuit loading.

Quiz Results

You answered 0 correctly, 0 incorrectly, and left 24 unanswered.
Your final score: 0/24 (1 mark per correct answer, -0.25 per wrong answer)
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