Exam (elaborations)
NABCEP PRACTICE EXAM QUESTIONS AND ANSWERS
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NABCEP PRACTICE EXAM QUESTIONS AND ANSWERS...
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NABCEP PRACTICE EXAM QUESTIONS AND ANSWERSAn off-grid installation has a 1HP pump operating 10% of the time and a 20W light
operating 100% of the time. What is the energy use per month? - ANSWER 68kWh
- ANSWER
What kind of ground faults do most inverters detect? - ANSWER DC
- ANSWER
Current carrying capability of a conductor (wire) is called. - ANSWER Ampacity
- ANSWER
Ohms law and voltage drop, the voltage/current relationship is. - ANSWER Proportional
- ANSWER
An array in sacramento California in August is producing less than it is supposed to.
Which of the following is a probable problem? - ANSWER Ac wire size is smaller and
voltage is lost
- ANSWER
When using a digital multimeter, what should you do first? - ANSWER Inspect the meter
, ANSWER
What is the worst design mistake? ANSWER Unequal tilt angles in a PV source circuit
ANSWER
The low design temperature is -20 degrees celsius and the Voc temperature correction
factor for your PV is -0.34%/degrees celsius. How many modules can you put in series
for an inverter that cannot go over 500V if the characteristics of your module are Isc =
8A, Voc = 29V? (-20°C - 25°C = -45°C) (-45°C × -0.34%/°C = 15.3% increase Voc) (1.15 ×
37Voc = 42.6V cold) (500V/42.6V= ?) - ANSWER 11 (11.7)
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MPPT is for. - ANSWER optimizing power from a PV array
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Concentrated PV. - ANSWER only works with direct sunlight
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Fall protection should be used at heights over. - ANSWER 6 feet
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Parallel PV circuit connections increase. - ANSWER current
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Optimal tilt for off-grid PV system in the winter. - ANSWER Latitude +15%
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END
For a TRANSFORMELESS INVERTER, what type of wire should be used when exposed to
the elements outdoor on PV source circuits? - ANSWER PV wire
- ANSWER
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