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Question 1 of 10
1. Question
Why are fiberglass ladders preferable over metal ladders?
Correct
Since PV systems generate electricity, using metal ladders is dangerous because of the risk of electrocution.
Incorrect
Since PV systems generate electricity, using metal ladders is dangerous because of the risk of electrocution.
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Question 2 of 10
2. Question
Given the formula I = P/V, solve for V.
Correct
Solution: V*(I) = (P/V) => VI/I = P/I => V = P/I
Incorrect
Solution: V*(I) = (P/V) => VI/I = P/I => V = P/I
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Question 3 of 10
3. Question
Which of the following is true about series PV connections?
Correct
Parallel connections have positive and negatives have one connection place for each, AC can be used with both parallel and series connections, and current will not flow if you connect two positive terminals.
Incorrect
Parallel connections have positive and negatives have one connection place for each, AC can be used with both parallel and series connections, and current will not flow if you connect two positive terminals.
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Question 4 of 10
4. Question
Calculate the efficiency of a 150W PV module that is 2156mm by 1087mm.
Correct
Solution: Convert mm to m => (2.156m)(1.087m) = 2.3sqm => 150W/2.3sqm = 65W/sqm => (65W/sqm)/(1000W/sqm) = 0.065 => (0.065)(100%) = 6.5% efficient
Incorrect
Solution: Convert mm to m => (2.156m)(1.087m) = 2.3sqm => 150W/2.3sqm = 65W/sqm => (65W/sqm)/(1000W/sqm) = 0.065 => (0.065)(100%) = 6.5% efficient
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Question 5 of 10
5. Question
Which of the following is not a reason why dissimilar PV modules shouldn’t be used in one series?
Correct
When modules are mismatched, a module with a lower current will limit current flow to the next module. There is also more resistance which creates heat and possibly, fire.
Incorrect
When modules are mismatched, a module with a lower current will limit current flow to the next module. There is also more resistance which creates heat and possibly, fire.
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Question 6 of 10
6. Question
Which of the following is the most ideal combination of factors that affect PV output?
Correct
Cold temperature increases voltage, while clean PV and increased irradiance improves current flow.
Incorrect
Cold temperature increases voltage, while clean PV and increased irradiance improves current flow.
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Question 7 of 10
7. Question
How much energy in 15 days will be made in a place with 6.2 PSH by a 100kWdc PV with 12% losses?
Correct
Solution: 1 – 0.12 = 0.88 derating => (100kWdc)(0.88 derating)(6.2PSH)(15 days) = 8184kWh per 15 days
Incorrect
Solution: 1 – 0.12 = 0.88 derating => (100kWdc)(0.88 derating)(6.2PSH)(15 days) = 8184kWh per 15 days
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Question 8 of 10
8. Question
Which of the following is the main advantage of an oversized battery?
Correct
A battery is used to store energy for later use which increases days of autonomy that allows you to go off-grid for a longer time.
Incorrect
A battery is used to store energy for later use which increases days of autonomy that allows you to go off-grid for a longer time.
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Question 9 of 10
9. Question
Which of the following conditions is the most dangerous?
Correct
Since cold temperature increases voltage, it might result in overvoltage.
Incorrect
Since cold temperature increases voltage, it might result in overvoltage.
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Question 10 of 10
10. Question
Convert 685W/m^2 in 5 hours to kWh.
Correct
Solution: (685W/m^2)/1000 = 0.685kW/m^2 => (0.685kW/m^2)(5 hours) = 3kWh
Incorrect
Solution: (685W/m^2)/1000 = 0.685kW/m^2 => (0.685kW/m^2)(5 hours) = 3kWh