QUESTION $-1$:

Describe the basic principles behind wind tunnel testing. Discuss the key components of a wind tunnel and their functions. Explain the importance of Reynolds number in scaling aerodynamic experiments.

QUESTION $-2$:

You are tasked with performing a wind tunnel test on a new airfoil design. Outline the experimental setup, including the type of wind tunnel, instrumentation, and the test procedure you would use. How would you ensure that the results are accurate and reliable?

QUESTION $-3$:

List and explain the different types of sensors and measurement devices commonly used in wind tunnel tests. How would you choose an appropriate sensor for measuring the pressure distribution over an airfoil?

QUESTION $-4$:

You are conducting an experiment using a Pitot$-$static tube to measure the airflow velocity over a model wing. Describe the calibration process and how you would ensure that your measurements are free from errors.