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

Question 1

What is the relationship between pressure and volume of a dry gas at constant temperature?

Accepted Answer

The volume is inversely proportional to pressure

Answer

The volume increases by a factor of 4 with double pressure

Answer

The ratio between pressure and volume is constant

Answer

The volume increases proportional with pressure

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

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 4

What change results from an increase in temperature of the carrying gas and of the environmental air at a gas balloon at maximum differential pressure?

Accepted Answer

The load capability decreases by 0.4% per K temperature change

Answer

The load capability decreases by 4% per K temperature change

Answer

The load capability increases by 4% per K temperature change

Answer

The load capability increases by 0.4% per K temperature change

Question 5

The standard state of gases refers to which temperature?

Accepted Answer

25° C

Answer

5° C

Answer

0° C

Answer

15° C

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

What statement is correct with regard to change in temperature?

Accepted Answer

During descent, the carrying gas warms adiabatically

Answer

During climb, the carrying gas warms due to thermal exchange with environmental air

Answer

During descent, the carrying gas warms due to thermal exchange with environmental air

Answer

During climb, the carrying gas warms adiabatically

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 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 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