EEE360 - ELECTRIC POWER SYSTEMS Questions with Correct Solutions
Question:
1. War of the currents
Answer:
AC vs DC. Thomas Edison favored DC while George Westinghouse and Nikola Tesla
supported AC. AC transmission won due to the ability to convert AC voltages from higher to
lower voltages using transformers. Less power line losses and can be transported longer
distances.
Question:
2. power plant
Answer:
converts the electrical energy (coal, oil, gas) or potential energy (water, nuclear) into
electrical energy
Question:
3. transmission and distribution lines
Answer:
transport and distribute electrical energy
Question:
4. substations with switch gear
Answer:
this transforms voltages, provides protection, form node points
Question:
5. loads
Answer:
consume energy
Question:
6. fossil and nuclear power plants
Answer:
thermal energy converted to high pressure high steam that drives a turbine which is
connected to a generator
, Question:
7. hydroelectric power plants
Answer:
the water falling to a lower elevation drives the turbine generator set
Question:
8. extra high voltage line
Answer:
transformers increase generator voltage to 500kV and supply EHV which carries energy to a
substation far away. They interconnect the power plant with substations in load centers. The
max length is 400-500 miles. EHV substations reduce voltage to high voltage.
Question:
9. high voltage line
Answer:
high voltage lines interconnect substations in different load centers. high voltage lines are
(115kv to 230kv) and max length is 100-200 miles.
Question:
10. system voltage
Answer:
described by a RMS value of line to line voltage
Question:
11. sub transmission lines
Answer:
interconnect substations within a town or a city. (15kv-34.5kv) max length 20-80 miles.
Question:
12. transformer
Answer:
changes the voltage and current
Question:
13. switchgear
Answer:
protects system
Question:
1. War of the currents
Answer:
AC vs DC. Thomas Edison favored DC while George Westinghouse and Nikola Tesla
supported AC. AC transmission won due to the ability to convert AC voltages from higher to
lower voltages using transformers. Less power line losses and can be transported longer
distances.
Question:
2. power plant
Answer:
converts the electrical energy (coal, oil, gas) or potential energy (water, nuclear) into
electrical energy
Question:
3. transmission and distribution lines
Answer:
transport and distribute electrical energy
Question:
4. substations with switch gear
Answer:
this transforms voltages, provides protection, form node points
Question:
5. loads
Answer:
consume energy
Question:
6. fossil and nuclear power plants
Answer:
thermal energy converted to high pressure high steam that drives a turbine which is
connected to a generator
, Question:
7. hydroelectric power plants
Answer:
the water falling to a lower elevation drives the turbine generator set
Question:
8. extra high voltage line
Answer:
transformers increase generator voltage to 500kV and supply EHV which carries energy to a
substation far away. They interconnect the power plant with substations in load centers. The
max length is 400-500 miles. EHV substations reduce voltage to high voltage.
Question:
9. high voltage line
Answer:
high voltage lines interconnect substations in different load centers. high voltage lines are
(115kv to 230kv) and max length is 100-200 miles.
Question:
10. system voltage
Answer:
described by a RMS value of line to line voltage
Question:
11. sub transmission lines
Answer:
interconnect substations within a town or a city. (15kv-34.5kv) max length 20-80 miles.
Question:
12. transformer
Answer:
changes the voltage and current
Question:
13. switchgear
Answer:
protects system
