# What is Solar energy?

What is Solar energy? 150 150 Affordable Capstone Projects Written from Scratch

## Instructions

### Question 1

In the northern hemisphere, the prevailing wind direction in the latitudes between 0 and 30 degrees is expected to be:

### Question 2

In the 1970s there was interest in developing wind power because of:

### Question 3

The mean wind speed at site A for a wind farm is 10% higher than at site B. What would be the expected increase in electricity production at site A compared to site B?

### Question 4

The fraction of power in the wind that a modern wind turbine can extract is approximately:

### Question 5

Turbine blades designed for three bladed turbines with the same tip-speed ratio have the same shape.

### Question 6

A wind turbine designed for a tip-speed ratio λ = 9, is operating in a mean wind speed of 12 m s1. The turbine blades are 50 m long. Estimate the number of revolutions made by the turbine in 30 years taking the capacity factor as 30%.

### Question 7

A typical spacing between turbines in a wind farm in terms of their rotor diameters D, when space is not a premium, is approximately:

### Question 8

The typical capacity factor of a wind farm is:

### Question 9

The power output per square kilometre of a wind farm consisting of turbines with rotor diameters D in a mean wind speed um depends approximately on:

### Question 10

In a region where the mean wind speed is 8 m s1, the area of land required for a wind farm to produce an average output of 100 MWe is about:

### Question 11

Which of the following statements about off-shore wind are true?

### Question 12

When wind is supplying less than ~20% of the power on a grid, its variability can be accommodated in the same way as ______ variations.

### Question 13

The global technical onshore wind potential is about:

### Question 14

There has been an annual growth in global installed wind capacity since 2010 of:

### Question 15

Match the installed wind power capacities (GW) in 2015 to the countries.

 China ~ 15 ~150 ~ 25 ~ 45 ~ 75 USA ~ 15 ~150 ~ 25 ~ 45 ~ 75 Germany ~ 15 ~150 ~ 25 ~ 45 ~ 75 India ~ 15 ~150 ~ 25 ~ 45 ~ 75 UK ~ 15 ~150 ~ 25 ~ 45 ~ 75

### Question 16

Which of the following statements about wind power are true?