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

Question 1

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 2

What is the difference between a gas balloon at or below maximum differential pressure during climb?

Accepted Answer

The balloon below maximum differential pressure climbs with constant rate to unlimited height.

Answer

The balloon at maximum differential pressure climbs with constant rate to unlimited height.

Answer

The balloon below maximum differential pressure climbs with constant rate up to maximum differential pressure height.

Answer

The balloon at maximum differential pressure climbs with constant rate up to maximum differential pressure height.

Question 3

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 4

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 ration between pressure and volume is constant

Answer

The volume increases proportional with pressure

Question 5

What statement is correct with regard to the density of a gas?

Accepted Answer

The density decreases with increasing temperature and constant pressure.

Answer

The density increases with increasing temperature and constant volume.

Answer

The density decreases with increasing temperature and constant volume.

Answer

The density decreases with decreasing volume and constant temperature.

Question 6

How does the norm height of a gas balloon with maximum differential pressure change by dropping ballast?

Accepted Answer

It increases by 80 m when total mass is reduced by 1%

Answer

It increases by 8 m when total mass is reduced by 10%.

Answer

It decreases by 8 m when total mass is reduced by 10%.

Answer

It decreases by 80 m when total mass is reduced by 1%.

Question 7

The standard state of gases refers to which temperature?

Accepted Answer

25° C

Answer

15° C

Answer

5° C

Answer

0° C

Question 8

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

Accepted Answer

Height number

Answer

Height value

Answer

Pressure number

Answer

Height ratio

Question 9

With regard to gases, which statement is correct?

Accepted Answer

Volume increases with increasing temperature and constant pressure.

Answer

Temperature decreases with increasing pressure and constant volume

Answer

Pressure decreases with increasing temperature and constant volume.

Answer

Temperature increases with increasing volume and decreasing pressure.

Question 10

What is a direct consequence of increase of the carrying gas temperature at a gas balloon with maximum differential pressure?

Accepted Answer

Load-bearing capability increases.

Answer

Climb force decreases.

Answer

Weight force increases.

Answer

Lift force decreases.

Question 11

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

Accepted Answer

Air density.

Answer

On the speed.

Answer

Balloon mass.

Answer

Shape of the envelope.

Question 12

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 13

The vertical extend of air with pressure changing by 1% with 80 m difference in height is referred to as ...

Accepted Answer

Homogene

Answer

Unstable

Answer

Stable

Answer

Inhomogene

Question 14

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

Accepted Answer

The upper pole.

Answer

At the equator

Answer

At the center of the hull

Answer

At the lower opening

Question 15

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 envorinmental air.

Answer

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

Answer

During climb, the carrying gas warms adiabatically

Question 16

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 17

In a given height, a given amount of ballast is uloaded from a gas balloon. How is the increase in height at 5500m different from the increase in height at MSL by unloading the same amount of ballast?

Accepted Answer

At 5500m the increase in height is twice as high.

Answer

At 5500m the increase in height is three times as high.

Answer

At both heights the same increase in height is observed.

Answer

At 5500m the increase in height is four times as high.

Question 18

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 19

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

Accepted Answer

Climb force

Answer

Load force

Answer

Upper force

Answer

Lift force

Question 20

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 21

What effect can sudden insolation from sunlight have on a gas balloon?

Accepted Answer

The height at maximum differential pressure decreases.

Answer

The height at maximum differential pressure increases.

Answer

The hull pressure decreases.

Answer

A sudden increase in rate of descent.

Question 22

At which height the load carrying capability of a gas balloon is reduced by approximately 50% compared to MSL?

Accepted Answer

At 6.500 m

Answer

At 11.000 m

Answer

At 18.000 m

Answer

At 1.500 m

Question 23

The standard state of gases refers to which temperature?

Accepted Answer

25° C

Answer

5° C

Answer

0° C

Answer

15° C

Question 24

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 25

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

Upper lift

Answer

Anti-ballast

Answer

Lower lift

Question 26

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 27

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.

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

Exam simulation BPL Gas Principles of Flight (Balloon) 100 questions on 120 minutes