NABCEP Practice Exam Questions with All Correct &
100% Verified Answers |Already Graded A+
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
What kind of ground faults do most inverters detect? ✔Correct Answer-DC
Current carrying ability of a conductor (wire) is called... ✔Correct Answer-Ampacity
According to ohms law and voltage drop, the relationship between voltage and current is...
✔Correct Answer-Proportional
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
When using a digital multimeter, what is the first thing you should do? ✔Correct Answer-Inspect
the meter
Which is the worst design error? ✔Correct Answer-Different tilt angles in a PV source circuit
The low design temperature is -20 degrees celsius and the Voc temperature correction factor for
your PV is -0.34%/degrees celsius. The characteristics of your module are Isc = 8A, Voc = 29V. How
many modules can you put in the series for an inverter that cannot go over 500V? (-20°C - 25°C = -
45°C) (-45°C × -0.34%/°C = 15.3% increase Voc) (1.15 × 37Voc = 42.6V cold) (500V/42.6V= ?)
✔Correct Answer-11 (11.7)
MPPT is for... ✔Correct Answer-optimizing power from a PV array
Concentrated PV... ✔Correct Answer-only works with direct sunlight
Fall protection should be used at heights over... ✔Correct Answer-6 feet
Parallel PV circuit connections increase... ✔Correct Answer-current
Optimal tilt for off-grid PV system in the winter... ✔Correct Answer-Latitude +15%
For a TRANSFORMELESS INVERTER, which type of wire should be used when exposed to the
elements outdoor on PV source circuits? ✔Correct Answer-PV wire
Bypass diodes are located in the... ✔Correct Answer-PV module
A PV array at a higher elevation would tend to produce more... ✔Correct Answer-Current
Voc = 36V, low temp = -2°C, inverter maximum input voltage = 500V, temp coef voltage = -0.35%/C°.
What is the maximum number of modules that can be connected in series? (-2°C - 25°C = -27°C) (-
27°C × -0.35%/°C = 9.45% increase Voc) (1.0945 × 36Voc = 39.4Voc cold) (500V/39.4V= ?) ✔Correct
Answer-12 (12.7)
100% Verified Answers |Already Graded A+
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
What kind of ground faults do most inverters detect? ✔Correct Answer-DC
Current carrying ability of a conductor (wire) is called... ✔Correct Answer-Ampacity
According to ohms law and voltage drop, the relationship between voltage and current is...
✔Correct Answer-Proportional
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
When using a digital multimeter, what is the first thing you should do? ✔Correct Answer-Inspect
the meter
Which is the worst design error? ✔Correct Answer-Different tilt angles in a PV source circuit
The low design temperature is -20 degrees celsius and the Voc temperature correction factor for
your PV is -0.34%/degrees celsius. The characteristics of your module are Isc = 8A, Voc = 29V. How
many modules can you put in the series for an inverter that cannot go over 500V? (-20°C - 25°C = -
45°C) (-45°C × -0.34%/°C = 15.3% increase Voc) (1.15 × 37Voc = 42.6V cold) (500V/42.6V= ?)
✔Correct Answer-11 (11.7)
MPPT is for... ✔Correct Answer-optimizing power from a PV array
Concentrated PV... ✔Correct Answer-only works with direct sunlight
Fall protection should be used at heights over... ✔Correct Answer-6 feet
Parallel PV circuit connections increase... ✔Correct Answer-current
Optimal tilt for off-grid PV system in the winter... ✔Correct Answer-Latitude +15%
For a TRANSFORMELESS INVERTER, which type of wire should be used when exposed to the
elements outdoor on PV source circuits? ✔Correct Answer-PV wire
Bypass diodes are located in the... ✔Correct Answer-PV module
A PV array at a higher elevation would tend to produce more... ✔Correct Answer-Current
Voc = 36V, low temp = -2°C, inverter maximum input voltage = 500V, temp coef voltage = -0.35%/C°.
What is the maximum number of modules that can be connected in series? (-2°C - 25°C = -27°C) (-
27°C × -0.35%/°C = 9.45% increase Voc) (1.0945 × 36Voc = 39.4Voc cold) (500V/39.4V= ?) ✔Correct
Answer-12 (12.7)
