CEM Renewable Energy Systems

Question 1

What is the typical efficiency range of commercial silicon photovoltaic (PV) solar panels under standard test conditions?

Accepted Answer

15–22%

Answer

Commercial silicon PV panels typically achieve 15–22% efficiency under standard test conditions (STC) of 1,000 W/m² and 25°C.

Question 2

Wind turbine power output is proportional to which mathematical relationship with wind speed?

Accepted Answer

Cubic (speed³)

Answer

Wind turbine power output is proportional to the cube of wind speed (P ∝ v³), meaning doubling wind speed increases power output eightfold.

Question 3

What does 'capacity factor' mean for a renewable energy system?

Accepted Answer

The ratio of actual energy produced to the maximum possible energy output over a period

Answer

Capacity factor is the ratio of actual energy produced over a time period to the energy that would have been produced if the system operated at full rated capacity for the same period.

Question 4

What is net metering in the context of a grid-tied solar energy system?

Accepted Answer

A billing arrangement where excess electricity exported to the grid earns credits on the customer's utility bill

Answer

Net metering allows solar system owners to export surplus electricity to the utility grid and receive bill credits at the retail rate for that exported energy.

Question 5

Which renewable energy technology harnesses the Earth's internal heat to generate electricity or provide direct heating?

Accepted Answer

Geothermal

Answer

Geothermal energy extracts heat stored within the Earth, using steam or hot water from underground reservoirs to drive turbines or provide direct space and process heat.

(CEM) Certified Emergency Manager Practice Test

(CEM) Certified Emergency Manager Practice Test

CEM Renewable Energy Systems