NABCEP Practice Exam Questions and Answers Graded A+
What kind of ground faults do most inverters detect? DC
Current carrying ability of a conductor (wire) is called... Ampacity
According to ohms law and voltage drop, the relationship
Proportional
between voltage and current is...
An array in sacramento California in August is not produc-
Decreased ac wire size and voltage loss
ing as expected. Which of the following is a likely problem?
When using a digital multimeter, what is the first thing you
Inspect the meter
should do?
Which is the worst design error? Ditterent 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 mod-
ule are Isc = 8A, Voc = 29V. How many modules can you
11 (11.7)
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=
?)
MPPT is for... optimizing power from a PV array
Concentrated PV... only works with direct sunlight
Fall protection should be used at heights over... 6 feet
Parallel PV circuit connections increase... current
Optimal tilt for ott-grid PV system in the winter... Latitude +15%
PV wire
1/3
What kind of ground faults do most inverters detect? DC
Current carrying ability of a conductor (wire) is called... Ampacity
According to ohms law and voltage drop, the relationship
Proportional
between voltage and current is...
An array in sacramento California in August is not produc-
Decreased ac wire size and voltage loss
ing as expected. Which of the following is a likely problem?
When using a digital multimeter, what is the first thing you
Inspect the meter
should do?
Which is the worst design error? Ditterent 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 mod-
ule are Isc = 8A, Voc = 29V. How many modules can you
11 (11.7)
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=
?)
MPPT is for... optimizing power from a PV array
Concentrated PV... only works with direct sunlight
Fall protection should be used at heights over... 6 feet
Parallel PV circuit connections increase... current
Optimal tilt for ott-grid PV system in the winter... Latitude +15%
PV wire
1/3
