ECE 3600 Exam 1 Closed Book
Questions – 100% Correct, Expert
Verified Answers with A+ Grade
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What is the most energy-efficient type of common power plant? Hint: It's also
one of the oldest.
ECE 3600 Exam 1 Fall 2013 ANSW ✔✔ Hydroelectric
Name 3 sources of electrical power for the grid which do not produce
greenhouse gasses by normal operation.
ECE 3600 Exam 1 Fall 2013 ANSW ✔✔ 3 of these: Hydroelectric, wind, solar
(steam or solar-cells), nuclear, geothermal
Decribe how a combined-cycle, natural gas, power plant works and achieves its
high efficiency?
ECE 3600 Exam 1 Fall 2013 ANSW ✔✔ The "waste" heat of a gas turbine is
then used to run a steam cycle generator.
Express power lost using the following: (Pin) and (η)
ECE 3600 Exam 1 Fall 2013 ANSW ✔✔ P losses = P in - η.P in
a) Why do transformers have a maximum voltage rating?
, b) That is, what bad thing are you trying to limit by limiting the voltage?
ECE 3600 Exam 1 Fall 2013 ANSW ✔✔ a) Core saturation
b) Insulation breakdown would happen at higher voltage
Why do transformers have a maximum current rating?
ECE 3600 Exam 1 Fall 2013 ANSW ✔✔ Winding resistance & I^2*R heating
When accounting for the non-ideal characteristics of a power transformer,
which of the following is the most important (least often neglected)?
1.magnetization reactance
2.core losses
3.winding losses
4.leakage reactance
ECE 3600 Exam 1 Fall 2013 ANSW ✔✔ leakage reactance
(Look at diagram on exam)
You have a 120/40-V, 480-VA transformer. Can you use this transformer to
transform 120 V to 80 V? If yes, show the connections and compute the new
VA rating.
ECE 3600 Exam 1 Fall 2013 ANSW ✔✔ 960 VA; look at picture to confirm
answer
Questions – 100% Correct, Expert
Verified Answers with A+ Grade
Assurance
What is the most energy-efficient type of common power plant? Hint: It's also
one of the oldest.
ECE 3600 Exam 1 Fall 2013 ANSW ✔✔ Hydroelectric
Name 3 sources of electrical power for the grid which do not produce
greenhouse gasses by normal operation.
ECE 3600 Exam 1 Fall 2013 ANSW ✔✔ 3 of these: Hydroelectric, wind, solar
(steam or solar-cells), nuclear, geothermal
Decribe how a combined-cycle, natural gas, power plant works and achieves its
high efficiency?
ECE 3600 Exam 1 Fall 2013 ANSW ✔✔ The "waste" heat of a gas turbine is
then used to run a steam cycle generator.
Express power lost using the following: (Pin) and (η)
ECE 3600 Exam 1 Fall 2013 ANSW ✔✔ P losses = P in - η.P in
a) Why do transformers have a maximum voltage rating?
, b) That is, what bad thing are you trying to limit by limiting the voltage?
ECE 3600 Exam 1 Fall 2013 ANSW ✔✔ a) Core saturation
b) Insulation breakdown would happen at higher voltage
Why do transformers have a maximum current rating?
ECE 3600 Exam 1 Fall 2013 ANSW ✔✔ Winding resistance & I^2*R heating
When accounting for the non-ideal characteristics of a power transformer,
which of the following is the most important (least often neglected)?
1.magnetization reactance
2.core losses
3.winding losses
4.leakage reactance
ECE 3600 Exam 1 Fall 2013 ANSW ✔✔ leakage reactance
(Look at diagram on exam)
You have a 120/40-V, 480-VA transformer. Can you use this transformer to
transform 120 V to 80 V? If yes, show the connections and compute the new
VA rating.
ECE 3600 Exam 1 Fall 2013 ANSW ✔✔ 960 VA; look at picture to confirm
answer
