NABCEP PRACTICE EXAM QUESTIONS AND
VERIFIED CORRECT ANSWERS GUARANTEED
A+ A 12V light is left on for 13 hours at 1.5A with a 12V battery. How many Ah are used?
(A × hrs = ?) - CORRECT ANSWER: 19.5Ah
A 12V light is left on for 13 hours at 1.5A with a 12V battery. How much energy is
used? (12V × 1.5A × 13hrs = ?) - CORRECT ANSWER: 0.234kWh
A 100kW STC system with 8% system loss, using PV that is +3 -0% production tolerance, a 95% efficient inverter, what would be the expected ac output if 1000W/m²
irradiance? (100kW × 0.92 × 1 × 0.95 = ?) - CORRECT ANSWER: 87.4kW
A PV array at a higher elevation would tend to produce more... - CORRECT ANSWER: Current
A system that sits on a flat/low slope rooftop and has no penetrations is called a... -
CORRECT ANSWER: ballasted system
According to ohms law and voltage drop, the relationship between voltage and current
is... - CORRECT ANSWER: Proportional
According to OSHA, what is the required slope for an extension ladder? - CORRECT
ANSWER: 1:4
An array in sacramento California in August is not producing as expected. Which of the
following is a likely problem? - CORRECT ANSWER: Decreased ac wire size and
voltage loss
An off-grid installation has a 1HP pump that is on 10% of the time and a 20W light that
is on 100% of the time. What is the energy use per month? - CORRECT ANSWER:
68kWh
Bypass diodes - CORRECT ANSWER: limit effects of shading
Bypass diodes are located in the... - CORRECT ANSWER: PV module
Concentrated PV... - CORRECT ANSWER: only works with direct sunlight
Current carrying ability of a conductor (wire) is called... - CORRECT ANSWER:
Ampacity
Decreased array size decreases battery life... - CORRECT ANSWER: due to not
charging the battery fully
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