CEM Renewable Energy Systems 2

Question 1

In a grid-tied solar PV system, what is the primary function of the inverter?

Accepted Answer

Convert DC power from solar panels into AC power compatible with the building and grid

Answer

The inverter is the core power conversion device in a grid-tied PV system, converting variable DC output from the panels into AC power that matches grid voltage and frequency.

Question 2

What is the wind speed at which a wind turbine first begins generating electricity called?

Accepted Answer

Cut-in speed

Answer

The cut-in speed is the minimum wind speed at which the turbine begins producing usable power; below this speed, wind energy is insufficient to overcome mechanical losses.

Question 3

Which type of solar thermal collector is most appropriate and cost-effective for low-temperature applications such as swimming pool heating?

Accepted Answer

Unglazed flat-plate collector

Answer

Unglazed flat-plate collectors are simple, inexpensive, and well-suited for pool heating, which only requires raising water temperature a few degrees above ambient.

Question 4

What does the metric 'peak sun hours' represent for a solar installation site?

Accepted Answer

The equivalent daily hours at 1,000 W/m² irradiance that delivers the same energy as actual daily solar radiation

Answer

Peak sun hours normalize the daily solar resource by converting total daily irradiation into equivalent hours at the 1,000 W/m² standard test condition irradiance.

Question 5

Which statement best describes a biomass energy system?

Accepted Answer

Combusting or thermochemically converting organic materials to produce heat or electricity

Answer

Biomass energy involves burning or thermochemically processing organic materials — such as wood, agricultural residues, or energy crops — to generate heat or electricity.

(CEM) Certified Emergency Manager Practice Test

(CEM) Certified Emergency Manager Practice Test

CEM Renewable Energy Systems 2