Energy-101 Quiz

Question 1 of 30

1. Primary purpose of electrical design (Ch 1-1)?

A) Minimize construction cost B) Reliable power delivery with min outage risk C) Maximize transmission voltage D) Standardize equipment

2. Unit switching arrangement advantage (Ch 2-1)?

A) Minimum generation loss from faults B) Lowest initial cost C) Simplest maintenance D) Maximum redundancy

3. Generator voltage limit slow-speed (Ch 3-2)?

A) ≤13.8 kV B) ≤22 kV C) ≤69 kV D) Unlimited

4. GSU transformer impedance tolerance (Ch 4-2)?

A) 7.5% B) 5% C) 10% D) 12.5%

5. Generator neutral grounding preference (Ch 3-5)?

A) Low impedance B) High impedance C) Solidly grounded D) Ungrounded

6. Transformer cooling designation (Ch 4-3)?

A) ONAN/ONAF B) ONAF/ONAF C) OFAF D) ANAN

7. Switchyard minimum voltage (Ch 5-1)?

A) 69 kV B) 13.8 kV C) 34.5 kV D) 230 kV

8. Surge arrester location (Ch 5-3)?

A) Transformer entrance bushings B) Generator terminals C) Switchgear only D) Bus section

9. Short-circuit ratio benefit (Ch 3-3)?

A) Better stability B) Higher efficiency C) Lower cost D) Smaller size

10. 3-winding transformer advantage (Ch 2-3)?

A) Low through fault impedance B) Unit isolation C) Highest reliability D) Lowest cost

11. Insulation class temperature rise (Ch 3-4)?

A) Class B/F: 75°C/90°C B) Class F: 115°C C) Class H: 150°C D) Class A: 50°C

12. Excitation system type preferred (Ch 3-6)?

A) Static excitation B) Rotating exciter C) Brushless D) DC separate

13. Generator capacity basis (Ch 3-1)?

A) Nameplate rating B) Max turbine HP at 100% gate C) Peak load demand D) Average flow

14. Power factor rating typical (Ch 3-2)?

A) 0.9 lagging B) 0.8 leading C) Unity D) 0.95 leading

15. Transformer tap range (Ch 4-2)?

A) ±10% in ⅝% steps B) ±5% fixed C) ±15% continuous D) No taps needed

16. Bushings minimum voltage class (Ch 4-4)?

A) Next higher standard B) Exact match C) Two classes higher D) Porcelain only

17. Oil preservation system (Ch 4-3)?

A) Conservator with diaphragm B) Nitrogen blanket C) Open breather D) Sealed tank

18. Station service voltage preferred (Ch 6-1)?

A) 4.16 kV B) 13.8 kV C) 480 V D) 2.4 kV

19. Circuit breaker rating basis (Ch 5-2)?

A) Max fault current B) Continuous current C) Momentary only D) Generator MVA

20. Disconnect switch purpose (Ch 5-4)?

A) Visible isolation B) Fault interruption C) Load switching D) Grounding only

21. Grounding transformer connection (Ch 6-3)?

A) Zig-zag wye B) Delta-wye C) Wye-wye D) Open delta

22. Surge arrester MCOV selection (Ch 5-3)?

A) 1.05 × Max line-ground voltage B) Exact L-G voltage C) 1.25 × L-L voltage D) System BIL rating

23. Station service transformer source (Ch 6-1)?

A) Unit auxiliary transformer B) GSU tertiary C) Off-site utility D) Generator terminals

24. Bus differential protection (Ch 5-2)?

A) Required for all switchyards B) Generator only C) Optional D) Transformer only

25. Generator capability curve limit (Ch 3-3)?

A) Rotor current & field heating B) Stator heating only C) Turbine HP only D) Voltage regulation

26. CT ratio selection basis (Ch 5-2)?

A) Max fault current B) Load current C) Relay burden D) Metering accuracy

27. Breaker failure scheme required (Ch 5-2)?

A) Multiple transmission circuits B) Single circuit only C) Generator bus only D) Station service

28. Exciter response time (Ch 3-6)?

A) <10 seconds to 95% ceiling B) <30 seconds C) <5 seconds D) Continuous

29. Transformer sound level limit (Ch 4-3)?

A) 65 dBA at 100 ft B) 75 dBA C) 55 dBA D) No limit

30. Protective relaying philosophy (Ch 5-1)?

A) Minimum clearing time B) Selectivity + dependability C) Speed only D) Cost minimization

⚡ Energy-101: Hydroelectric Power Plants