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

Question 1

What effect has an increase in air temperature inside the hull of a hot air balloon by a given difference in temperature?

Accepted Answer

The increase in load carrying capacity decreases with height.

Answer

The increase in load carrying capacity increases with height.

Answer

The increase in rate of climb increases with height.

Answer

The reduction in sink rate increases with height.

Question 2

The ratio between air pressures at different heights is referred to as:

Accepted Answer

Height number

Answer

Pressure number

Answer

Height value

Answer

Height ratio

Question 3

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 4

What cause may result in a reduction of volume of a free balloon?

Accepted Answer

A gust

Answer

Reduction in mass

Answer

Cooling of environment air

Answer

Increase in hull temperature

Question 5

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 6

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 7

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 8

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 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

With pressure and temperature given, any gas being heavier or lighter than air depends on what?

Accepted Answer

On the molecule mass of the gas

Answer

On the mean kinetic energy of the molecules

Answer

On the content of water vapour in the gas

Answer

On the number of gas molecules

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