NABCEP Practice Exam Questions with 100% Correct
Answers.
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? - ANS 68kWh
- ANS
What kind of ground faults do most inverters detect? - ANS DC
- ANS
Current carrying ability of a conductor (wire) is called... - ANS Opacity
- ANS
According to ohms law and voltage drop, the relationship between voltage and
current is... - ANS Proportional
- ANS
An array in Sacramento California in August is not producing as expected. Which of
the following is a likely problem? - ANS Decreased ac wire size and voltage loss
- ANS
When using a digital millimeter, what is the first thing you should do? - ANS Inspect
the meter
- ANS
Which is the worst design error? - ANS Different tilt angles in a PV source circuit
- ANS
The low design temperature is -20 degrees Celsius and the Vic temperature
correction factor for your PV is -0.34%/degrees Celsius. The characteristics of your
module are Sic = 8A, Vic = 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 Vic) (1.15 × 37Voc = 42.6V cold) (500V/42.6V=?) - ANS 11 (11.7)
- ANS
MPPT is for... - ANS optimizing power from a PV array
- ANS
Concentrated PV... - ANS only works with direct sunlight
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Answers.
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? - ANS 68kWh
- ANS
What kind of ground faults do most inverters detect? - ANS DC
- ANS
Current carrying ability of a conductor (wire) is called... - ANS Opacity
- ANS
According to ohms law and voltage drop, the relationship between voltage and
current is... - ANS Proportional
- ANS
An array in Sacramento California in August is not producing as expected. Which of
the following is a likely problem? - ANS Decreased ac wire size and voltage loss
- ANS
When using a digital millimeter, what is the first thing you should do? - ANS Inspect
the meter
- ANS
Which is the worst design error? - ANS Different tilt angles in a PV source circuit
- ANS
The low design temperature is -20 degrees Celsius and the Vic temperature
correction factor for your PV is -0.34%/degrees Celsius. The characteristics of your
module are Sic = 8A, Vic = 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 Vic) (1.15 × 37Voc = 42.6V cold) (500V/42.6V=?) - ANS 11 (11.7)
- ANS
MPPT is for... - ANS optimizing power from a PV array
- ANS
Concentrated PV... - ANS only works with direct sunlight
Page 1|4
