Per-Unit System and Single Line Diagrams — MCQs – EE

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1. The per-unit system in power engineering is used to:



2. The main advantage of the per-unit system is:



3. In per-unit system, base quantities are usually selected as:



4. The per-unit impedance remains the same:



5. The per-unit value of a quantity is obtained by dividing:



6. In per-unit calculations, if base MVA and base kV are known, then base current and impedance can be:



7. The per-unit system is particularly useful in:



8. The per-unit value of unity power factor load impedance is:



9. If all system quantities are expressed in per-unit, then:



10. The per-unit system simplifies fault analysis because:



11. Base kV for a transformer is usually selected as:



12. The per-unit reactance of most electrical equipment lies between:



13. The per-unit impedance of a transformer is independent of:



14. The base MVA for the entire system in per-unit analysis is chosen:



15. The single-line diagram of a power system shows:



16. In a single-line diagram, a bus represents:



17. The per-unit system is most advantageous when:



18. A single-line diagram is also called a:



19. In a single-line diagram, transformers are represented by:



20. The single-line diagram provides information about:



21. The base impedance in per-unit system is given by:



22. When base MVA changes, per-unit reactance:



23. The main use of single-line diagrams is in:



24. The elements shown in a single-line diagram include:



25. The per-unit voltage of the slack bus in load flow study is usually taken as:



26. In per-unit system, the base current is directly proportional to:



27. The per-unit value of power is:



28. The main purpose of per-unit normalization is to:



29. In a single-line diagram, circuit breakers are represented by:



30. The single-line diagram of a power system is mainly used for:



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