REP Solar Energy Systems 3

Question 1

Soiling losses on PV panels are primarily caused by which of the following?

Accepted Answer

Dust, dirt, bird droppings, and other surface deposits

Answer

Soiling refers to the accumulation of contaminants on the panel surface that block incoming light and reduce output power.

Question 2

What is the typical temperature coefficient of power (Pmax) for a standard crystalline silicon PV module?

Accepted Answer

-0.5% per °C

Answer

Most crystalline silicon modules lose approximately 0.3–0.5% of rated power for every degree Celsius above 25°C (STC).

Question 3

In solar thermal systems, what does the 'stagnation temperature' refer to?

Accepted Answer

Maximum temperature reached when there is no fluid flow

Answer

Stagnation temperature is the highest temperature a collector can reach when fluid circulation stops and all absorbed heat remains in the collector.

Question 4

Which PV cell technology generally has the highest commercial module efficiency?

Accepted Answer

Monocrystalline silicon (mono-Si)

Answer

Monocrystalline silicon modules achieve the highest commercial efficiencies, typically 20–23%, due to their highly ordered crystal structure.

Question 5

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

Accepted Answer

A billing arrangement where excess solar energy is credited against grid consumption

Answer

Net metering allows customers to send surplus PV energy to the grid and receive a credit on their utility bill, effectively running the meter backward.

(REP) Certified Renewable Energy Professional Practice Test

(REP) Certified Renewable Energy Professional Practice Test

REP Solar Energy Systems 3