Principles of Flight (Balloon) - Quiz BPL Hot Air - Balloon Pilot License

Question 1

How does a gas react when released from a pressurized container?

Accepted Answer

The gas cools adiabatically due to expansion

Answer

The gas cools due to thermal contact with environmental air.

Answer

The gas heats adiabatically due to expansion.

Answer

The gas condenses inside the envelope.

Question 2

Aerostatic lift, amongst other factors, depends on...

Accepted Answer

Air density.

Answer

Shape of the envelope.

Answer

On the speed.

Answer

Balloon mass.

Question 3

The dynamic lift created by airflow across the top of the envelope of a balloon on the ground is referred to as?

Accepted Answer

False lift

Answer

Lower lift

Answer

Upper lift

Answer

Anti-ballast

Question 4

The increase in load carrying capability by increasing the hull air temperature by the same temperature difference ...

Accepted Answer

Decreases with altitude.

Answer

Increases with balloon mass.

Answer

Increases with altitude.

Answer

Decreases with sinking.

Question 5

Which of the following statements is correct?

Accepted Answer

At higher altitude, sink rate in case of cooling is increased due to less drag by less density.

Answer

At higher altitude, sink rate by cooling is not increased because due to low density the mass inside the hull is also less.

Answer

Higher drag at higher altitude prevents increased sink rate in case of cooling.

Answer

Maximum sink rate must be equal at all altitudes as prescribed by design regulations.

Question 6

The force resulting from the (positive) difference from load-bearing capacity and weight force, is referred to as:

Accepted Answer

Climb force

Answer

Upper force

Answer

Lift force

Answer

Load force

Question 7

How do volume, density and temperature change when a gas is being compressed?

Accepted Answer

Volume decreases, density increases, temperature increases.

Answer

Volume decreases, density decreases, temperature decreases.

Answer

Volume decreases, density increases, temperature increases

Answer

Volume increases, density decreases, temperature decreases.

Question 8

Doubling the pressure of a dry gas at constant temperature results in a change of the volume to:

Accepted Answer

Half the previous value.

Answer

Double the previous value.

Answer

Four times the previous value.

Answer

A quarter of the previous value.

Question 9

Changing the shape of the envelope of a free balloon, e.g. by a gust, results in:

Accepted Answer

Decrease in volume

Answer

Increase in lift.

Answer

Increase of displaced air.

Answer

Decrease in weight.

Question 10

At equilibrium the inner overpressure of a free balloon is highest at:

Accepted Answer

The upper pole.

Answer

At the lower opening.

Answer

At the center of the hull.

Answer

At the equator.

Quiz Principles of Flight (Balloon) - Quiz BPL Hot Air - Balloon Pilot License

Test 10 Questions Quiz BPL Hot Air - Balloon Pilot License - Principles of Flight (Balloon), no time limit