Basic Aerodynamic Theory: DGCA Technical General questions

Question 1

The statement Energy and mass can neither be created nor destroyed, only changed from one form to another refers to:

Accepted Answer

The principle of continuity.

Answer

Bernoulli's theorem.

Answer

The equation of kinetic energy.

Answer

Bernoulli's principle of continuity.

Question 2

If the cross-sectional area of an airflow is mechanically reduced:

Accepted Answer

The mass flow remains constant and the velocity of the airflow increases.

Answer

The velocity of the airflow remains constant and the kinetic energy increases.

Answer

The velocity of the airflow remains constant and the mass flow increases.

Answer

The mass flow remains constant and the static pressure increases.

Question 3

The statement Pressure plus Kinetic energy equals constant refers to:

Accepted Answer

Bernoulli's theorem.

Answer

The principle of continuity.

Answer

Newton's second law of motion.

Answer

The Magnus effect.

Question 4

When considering a streamlined airflow, which statements are correct? 1 Streamlines close together indicate a decrease in static pressure. 2 Streamlines close together indicate an increase in velocity. 3 Converging streamlines indicate accelerating airflow with decreasing static pressure. 4 Diverging streamlines indicate decelerating airflow with increasing static pressure.

Accepted Answer

1, 2, 3 and 4.

Answer

2 and 4.

Answer

1, 3 and 4.

Answer

2, 3 and 4.

Question 5

If the velocity of an air mass is increased:

Accepted Answer

The kinetic energy will increase, the dynamic pressure will increase and the static pressure will decrease.

Answer

The dynamic pressure will decrease and the static pressure will increase.

Answer

The static pressure will remain constant and the kinetic energy will increase.

Answer

The mass flow will stay constant, the dynamic pressure will decrease and the static pressure will increase.

Basic Aerodynamic Theory: DGCA Technical General questions

4 more questions in this chapter

More chapters in Standard Book