Power Systems MCQs | Part 2 | Diploma in Electrical Engineering

This is Part 2 of 30 MCQs on Power Systems for the Diploma in Electrical Engineering. This set of 30 MCQs will test your knowledge. Each question focuses on different aspects of power systems. Use these questions to prepare for exams.

1. Which method is used to improve the power factor in power systems?

A. Using inductors B. Using capacitors C. Using resistors D. Using transformers

2. What is the primary purpose of a surge arrester in power systems?

A. Measure voltage B. Protect against voltage spikes C. Interrupt current flow D. Step up voltage

3. What does the term “harmonics” refer to in power systems?

A. High-frequency signals superimposed on the fundamental wave B. Low-frequency signals C. Power losses D. Voltage fluctuations

4. What is the function of a STATCOM in power systems?

A. Measure current B. Step up voltage C. Provide reactive power compensation D. Protect against overcurrent

5. Which relay is used for the protection of a transformer?

A. Differential relay B. Distance relay C. Overcurrent relay D. Earth fault relay

6. What is the main advantage of using HVDC transmission?

A. Lower insulation costs B. No reactive power loss C. Easier voltage transformation D. Higher power loss

7. What is the purpose of a synchronous generator in a power plant?

A. Convert AC to DC B. Generate electrical power C. Step up voltage D. Store electrical energy

8. What does “CT” stand for in power systems?

A. Circuit Transformer B. Current Transformer C. Capacitor Transformer D. Coil Transformer

9. What is the main cause of voltage instability in power systems?

A. High load demand B. Low load demand C. High power factor D. Low power factor

10. What does the term “fault tolerance” refer to in power systems?

A. Ability to avoid faults B. Ability to continue operation during faults C. Ability to detect faults D. Ability to isolate faults

11. What is the purpose of a load flow study in power systems?

A. Determine voltage drops B. Determine current flow C. Determine power loss D. All of the above

12. Which algorithm is commonly used for load flow analysis in power systems?

A. Gauss-Seidel method B. Newton-Raphson method C. Fast Decoupled method D. All of the above

13. What is the function of a capacitor bank in a substation?

A. Store electrical energy B. Provide reactive power compensation C. Measure voltage D. Interrupt current flow

14. What is the purpose of using a reactor in power systems?

A. Limit short circuit currents B. Step up voltage C. Measure current D. Provide reactive power compensation

15. What is the significance of “per unit” system in power system analysis?

A. Simplifies calculations B. Standardizes different equipment ratings C. Reduces error in measurements D. Both A and B

16. What is the main advantage of a ring main distribution system?

A. High reliability B. Low cost C. High power loss D. Low power factor

17. Which type of circuit breaker is most suitable for high voltage applications?

A. Air circuit breaker B. Oil circuit breaker C. SF6 circuit breaker D. Vacuum circuit breaker

18. What is the function of a power transformer in a substation?

A. Step up or step down voltage B. Measure current C. Store electrical energy D. Interrupt current flow

19. What does the term “load curve” represent in power systems?

A. Variation of load with time B. Variation of voltage with time C. Variation of current with time D. Variation of power factor with time

20. Which device is used to measure the total energy consumed by a load?

A. Voltmeter B. Ammeter C. Wattmeter D. Energy meter

21. What is the role of a circuit breaker in power systems?

A. Measure voltage B. Interrupt current flow during faults C. Store electrical energy D. Provide reactive power compensation

22. What is the main function of a lightning arrester?

A. Measure voltage B. Protect against lightning surges C. Interrupt current flow D. Step up voltage

23. What is the primary purpose of load forecasting in power systems?

A. Determine future power demand B. Measure current power consumption C. Measure voltage levels D. Determine power losses

24. What is the function of a Buchholz relay in a transformer?

A. Measure voltage B. Measure current C. Detect faults inside the transformer D. Provide reactive power compensation

25. Which component is used to convert AC to DC in power systems?

A. Transformer B. Rectifier C. Inverter D. Reactor

26. What is the primary function of a static VAR compensator (SVC)?

A. Store electrical energy B. Provide reactive power compensation C. Measure voltage D. Interrupt current flow

27. What does the term “load shedding” mean in power systems?

A. Increasing power supply B. Reducing power supply to prevent overload C. Balancing power supply D. None of the above

28. What is the main advantage of using digital relays over electromechanical relays?

A. Higher reliability B. Greater accuracy C. Faster response time D. All of the above

29. What is the purpose of a power system stabilizer (PSS)?

A. Measure voltage B. Improve system stability by damping oscillations C. Store electrical energy D. Provide reactive power compensation

30. What is the function of a distance relay in power systems?

A. Measure current B. Provide reactive power compensation C. Detect and isolate faults based on impedance D. Step up voltage

Review Your Answers Above.

The Bottom Line

Thank you for going through Part 2 of MCQs on Power Systems for the Diploma in Electrical Engineering”. Review the questions regularly. Stay updated with power system concepts. Keep practicing and learning.

30 MCQs on Power Systems (Part 2) | Diploma in Electrical Engineering

1. Which method is used to improve the power factor in power systems?

2. What is the primary purpose of a surge arrester in power systems?

3. What does the term “harmonics” refer to in power systems?

4. What is the function of a STATCOM in power systems?

5. Which relay is used for the protection of a transformer?

6. What is the main advantage of using HVDC transmission?

7. What is the purpose of a synchronous generator in a power plant?

8. What does “CT” stand for in power systems?

9. What is the main cause of voltage instability in power systems?

10. What does the term “fault tolerance” refer to in power systems?

11. What is the purpose of a load flow study in power systems?

12. Which algorithm is commonly used for load flow analysis in power systems?

13. What is the function of a capacitor bank in a substation?

14. What is the purpose of using a reactor in power systems?

15. What is the significance of “per unit” system in power system analysis?

16. What is the main advantage of a ring main distribution system?

17. Which type of circuit breaker is most suitable for high voltage applications?

18. What is the function of a power transformer in a substation?

19. What does the term “load curve” represent in power systems?

20. Which device is used to measure the total energy consumed by a load?

21. What is the role of a circuit breaker in power systems?

22. What is the main function of a lightning arrester?

23. What is the primary purpose of load forecasting in power systems?

24. What is the function of a Buchholz relay in a transformer?

25. Which component is used to convert AC to DC in power systems?

26. What is the primary function of a static VAR compensator (SVC)?

27. What does the term “load shedding” mean in power systems?

28. What is the main advantage of using digital relays over electromechanical relays?

29. What is the purpose of a power system stabilizer (PSS)?

30. What is the function of a distance relay in power systems?

The Bottom Line

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