# Airport Engineering MCQ – Set 4

This set of Airport Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Windrose”.

1. What is the diagram used to decide the runway orientation known as?
a) Wind Rose
b) Wind Figure
c) Wind Rise
d) Wind velocity

Explanation: The diagram used to decide the runway orientation is called wind rose. The wind data is graphically represented by the wind rose diagram. It represents wind data like direction, duration and intensity of wind. It is a graphical tool used by meteorologists to give a view of how the wind speed and direction are distributed in a particular region and to decide the best runway orientation accordingly.

2. The plotting of the wind rose diagrams is done in the two ways. Which of the following wind data is shown by type l wind rose?
a) Direction and duration of the wind
b) Only the duration of the wind
c) Only the intensity of the wind
d) Direction, duration and intensity of the wind

Explanation: Type I wind rose shows the direction and duration of the wind. The radial lines in the wind rose diagram of type 1 indicate the wind direction and each circle represents the duration of wind to a certain scale.

3. Which of the following is represented by type II wind rose diagram and not by type l?
a) Direction the wind
b) Speed of the wind
c) Duration of the wind
d) Intensity of the wind

Explanation: Type II wind rose diagram shows the direction, duration and the intensity of the wind. In the wind rose diagram type II, each circle represents the wind intensity to some scale. The values entered in each segment represent the percentage of time in a year during which the wind having a particular intensity blows from the respective directions.

4. It is possible to get the direction of the opposite wind which is parallel to the center line of the runway length every day or throughout the year.
a) True
b) False

Explanation: It is not possible to get the direction of the opposite wind parallel to the center line of the runway length every day or throughout the year as the wind direction changes often. If the direction of wind is at an angle to the runway center line then its component along the direction of runway will be V Cos θ and that normal to the runway center line will be V Sin θ where V is the wind velocity.

5. What is the percentage of time in a year during which the cross-wind component remains within the limit of 25 kmph called?
a) Wind limit
b) Wind orientation
c) Mean wind
D) Wind coverage

Explanation: The percentage of time in a year during which the cross-wind component remains within the limit of 25 kmph is called the wind coverage of the runway. According to the FAA, the runway handling mixed air traffic should be planned for 95 % of time in a year. The wind coverage may be increased to 98 % to 100% for busy airports.

6. Which coordinate system is used for plotting the wind rose diagram?
a) Cartesian coordinate system
b) Spherical coordinate system
c) Polar coordinate system
d) homogenous coordinate system

Explanation: The wind rose diagram is plotted with the polar coordinate system. Using the polar coordinate system, the frequency of wind over a time period is plotted. The direction of the greatest spoke in the diagram shows the wind direction with greatest frequency.

7. Which of the following is represented by the color-coded bands on the wind rose diagram?
a) Ranges of wind intensity
b) Ranges of the frequency of wind
c) Ranges of the speed of wind
d) Ranges of wind duration

Explanation: The color-coded bands represent the ranges of the speed of wind. Each spoke is broken down into color-coded bands which represent various ranges of the speed of wind in the that region.

8. The best direction of runway is indicated along the direction of the shortest line on the wind rose diagram.
a) True
b) False

Explanation: The best direction of runway is indicated along the direction of the longest line on the wind rose diagram. The total percentage of wind blowing in each direction are plotted and then joined by the straight lines and the longest of these lines is chosen to indicate the best direction for the runway construction.

Sanfoundry Global Education & Learning Series – Airport Engineering.