Principles of Flight (Balloon) - Quiz BPL Gas - Balloon Pilot License

Question 1

The aerostatic lift corresponds to which force?

Accepted Answer

The weight of the displaced air

Answer

The dynamic force due to airstream across the top of the hull

Answer

The drag due to airstream around the balloon envelope

Answer

The weight of the balloon less ballast

Question 2

The standard state of gases refers to which temperature?

Accepted Answer

25° C

Answer

15° C

Answer

5° C

Answer

0° C

Question 3

Below maximum differential pressure of a gas balloon, temperature increase of the carrying gas by 1K results in:

Accepted Answer

Volume increase by 0,4%

Answer

Volume decrease by 0,4%

Answer

Volume increase by 4%

Answer

Volume decrease by 4%

Question 4

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

Accepted Answer

The gas cools adiabatically due to expansion.

Answer

The gas heats adiabatically due to expansion

Answer

The gas condenses inside the envelope

Answer

The gas cools due to thermal contact with environmental air.

Question 5

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 6

According ISA, what is the density of air at MSL?

Accepted Answer

1.225 kg/m3

Answer

1.225 g/m3

Answer

1225 kg/m3

Answer

12.25 kg/m3

Question 7

How does the norm height of a gas balloon with maximum differential pressure change, when its mass is reduced by 1%?

Accepted Answer

Norm height increases by 80 m.

Answer

Norm height increases by 800 m.

Answer

Norm height decreases by 800 m.

Answer

Norm height decreases by 80 m

Question 8

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 content of water vapour in the gas

Answer

On the mean kinetic energy of the molecules

Answer

On the number of gas molecules

Question 9

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

Accepted Answer

Volume decreases, density increases, temperature increases.

Answer

Volume increases, density decreases, temperature decreases

Answer

Volume decreases, density decreases, temperature decreases.

Question 10

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

Accepted Answer

Air density.

Answer

On the speed.

Answer

Balloon mass.

Answer

Shape of the envelope.

Quiz Principles of Flight (Balloon) - Quiz BPL Gas - Balloon Pilot License

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