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Question 1 of 10
1. Question
Which of the following describes the equalization stage in battery charging?
Correct
The other statements describe the other charging states like bulk (charging is fast), absorption (charge is slowing down), float (trickle charge).
Incorrect
The other statements describe the other charging states like bulk (charging is fast), absorption (charge is slowing down), float (trickle charge).
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Question 2 of 10
2. Question
What is irradiance’s unit?
Correct
The unit of irradiance is W/m^2, where W is power and m^2 is area, which means that irradiance is the power per area.
Incorrect
The unit of irradiance is W/m^2, where W is power and m^2 is area, which means that irradiance is the power per area.
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Question 3 of 10
3. Question
What is the expected AC output of a STC PV with the following characteristics: 100kW, 8% losses, +3 -0% production tolerance, 95% efficiency, and 100W/m2?
Correct
The derating factor of +3 -0% is 1 because we don’t lose anything. Solution: (100kW)(0.92)(1 derating factor)(0.95 efficiency) = 87.4kW
Incorrect
The derating factor of +3 -0% is 1 because we don’t lose anything. Solution: (100kW)(0.92)(1 derating factor)(0.95 efficiency) = 87.4kW
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Question 4 of 10
4. Question
What is the current of a 100W fan plugged in a 110V socket?
Correct
Solution: 100W/110V = 0.909A
Incorrect
Solution: 100W/110V = 0.909A
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Question 5 of 10
5. Question
Convert 2kW to W.
Correct
Solution: (2kW)(1000) = 2000W
Incorrect
Solution: (2kW)(1000) = 2000W
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Question 6 of 10
6. Question
Which of the following increases in a series PV circuit?
Correct
The answer is voltage because the property of a series circuit is that it increases voltage, while parallel circuits increase current.
Incorrect
The answer is voltage because the property of a series circuit is that it increases voltage, while parallel circuits increase current.
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Question 7 of 10
7. Question
What is the maximum voltage of a PV system with 10 modules if the Voc is 12V and the correction factor is 0.9?
Correct
Solution: (10 modules)(12V)(0.9 correction factor) = 108V
Incorrect
Solution: (10 modules)(12V)(0.9 correction factor) = 108V
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Question 8 of 10
8. Question
Which of the following is a process involved in the maintenance of sealed valve regulated batteries?
Correct
The answer is cleaning battery terminals because it is a part of maintenance that can be done on all types of batteries. The battery is sealed, therefore, equalization and accessing the battery fluid cannot be done.
Incorrect
The answer is cleaning battery terminals because it is a part of maintenance that can be done on all types of batteries. The battery is sealed, therefore, equalization and accessing the battery fluid cannot be done.
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Question 9 of 10
9. Question
How much energy will be consumed in a year if a 40W light bulb is continuously on?
Correct
Solution: (40W)(24 hours/day)(365 days) = 350400Wh => 350400Wh/1000 = 350kWh
Incorrect
Solution: (40W)(24 hours/day)(365 days) = 350400Wh => 350400Wh/1000 = 350kWh
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Question 10 of 10
10. Question
How much energy in an hour is consumed by a 9V pump working at 4A?
Correct
Solution: (9V)(4A) = 36W => (36W)(1 hour) = 36Wh => 36Wh/1000 = 0.036kWh
Incorrect
Solution: (9V)(4A) = 36W => (36W)(1 hour) = 36Wh => 36Wh/1000 = 0.036kWh