NABCEP PRACTICE QUESTIONS AND ANSWERS

power=250W, open circuit voltage=40V, maximum power voltage=35V, short circuit current=8A, maximum power current=7.5A, temp coefficient for voltage= -0.33%/°C, CEC power=220W, NOCT=48°C, Inverter low MPPT voltage=230V, Inverter maximum input voltage=550V There are 4 PV source circuits of 10 modules each. What is the MPPT voltage of the array at Standard Test Conditions? a. 160V b. 350V c. 140v d. 230V - Answer- b. 350V an off grid installation has 1 HP pump that is on 10% of the time & a 20W light that is on 100% of the time. What is the energy use per month a. 54 Wh b. 68 Wh c. 68 kWh d. 0.63 MWh - Answer- c. 68 kWh What kind of ground faults do most inverters detect? a. High voltage b. Medium voltage c. AC d. DC - Answer- d. DC Current carrying ability of a conductor(wire) is called a. Ampacity b. Amps c. Inductance d. Insolation - Answer- a. Ampacity According to Ohms law and voltage drop, the relationship between voltage and current is a. Proportional b. Inversely proportional c. Directly Inverse d. Indirectly direct - Answer- a.Proportional