CEM Renewable Energy Systems 3

Question 1

What is the Levelized Cost of Energy (LCOE) used for in renewable energy project analysis?

Accepted Answer

Comparing the lifetime cost-competitiveness of different energy technologies on a per-kWh basis

Answer

Calculating the total installed weight of all energy generation equipment

Answer

Measuring the levelized carbon dioxide emissions per megawatt-hour of generation

Answer

Determining the optimum tilt angle and azimuth for a solar array at a given latitude

Question 2

Which commercially available solar panel technology typically achieves the highest conversion efficiency?

Accepted Answer

Monocrystalline silicon

Answer

Thin-film amorphous silicon

Answer

Cadmium telluride (CdTe)

Answer

Polycrystalline silicon

Question 3

What is a Renewable Portfolio Standard (RPS) as used in US energy policy?

Accepted Answer

A government mandate requiring utilities to supply a defined minimum percentage of electricity from eligible renewable sources

Answer

A building code specifying minimum renewable energy equipment for new construction

Answer

A voluntary quality rating system for renewable energy equipment manufacturers

Answer

A standardized test procedure for measuring solar panel output under field conditions

Question 4

What is the primary energy production benefit of installing a single-axis solar tracking system compared to a fixed-tilt array?

Accepted Answer

Increases annual energy capture by 20–40% by keeping panels perpendicular to the sun throughout the day

Answer

Reduces inverter losses by maintaining constant panel temperature

Answer

Eliminates the need for maximum power point tracking electronics

Answer

Reduces soiling losses by keeping panels at a steeper tilt angle

Question 5

What does the Betz limit of approximately 59.3% represent in wind energy engineering?

Accepted Answer

The theoretical maximum fraction of kinetic wind energy that any turbine can extract

Answer

The maximum safe rotor tip speed expressed as a ratio to wind speed

Answer

The minimum wind speed required to start a utility-scale turbine

Answer

The maximum blade chord length allowed under international turbine standards

Question 6

What is a Power Purchase Agreement (PPA) in the context of commercial renewable energy procurement?

Accepted Answer

A long-term contract to buy electricity at a pre-negotiated price from a renewable energy generator, often with no upfront capital cost to the buyer

Answer

A bank loan specifically designed to finance renewable energy capital equipment purchases

Answer

A federal subsidy program that reimburses organizations for renewable energy purchases

Answer

An insurance product that guarantees minimum energy production from a renewable system

Question 7

Which metric expresses the proportion of a building's total annual energy consumption that is met by its on-site solar energy system?

Accepted Answer

Solar fraction

Answer

Power factor

Answer

Capacity factor

Answer

Load factor