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

Exam simulation bpl-gas 100 questions on 120 minutes

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1 - 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? The load capability decreases by 4% per K temperature change. The load capability increases by 4% per K temperature change. The load capability increases by 0,4% per K temperature change. The load capability decreases by 0,4% per K temperature change.

2 - The standard state of gases refers to which temperature? 5° C 0° C 15° C 25° C

3 - The vertical extend of air with pressure changing by 1% with 80 m difference in height is referred to as ... Unstable Homogene Stable Inhomogene

4 - The dynamic lift created by airflow across the top of the envelope of a balloon on the ground is referred to as? Upper lift Anti-ballast Lower lift False lift

5 - What is a direct consequence of increase of the carrying gas temperature at a gas balloon with maximum differential pressure? Climb force decreases. Weight force increases. Lift force decreases. Load-bearing capability increases.

6 - At equilibrium the inner overpressure of a free balloon is highest at: At the equator The upper pole. At the center of the hull At the lower opening

7 - Doubling the pressure of a dry gas at constant temperature results in a change of the volume to: Double the previous value Four times the previous value. Half the previous value. A quarter of the previous value.

8 - 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? At 5500m the increase in height is twice as high. At 5500m the increase in height is three times as high. At both heights the same increase in height is observed. At 5500m the increase in height is four times as high.

9 - Aerostatic lift, amongst other factors, depends on... On the speed. Balloon mass. Shape of the envelope. Air density.

10 - What statement is correct with regard to the density of a gas? The density increases with increasing temperature and constant volume. The density decreases with increasing temperature and constant volume. The density decreases with increasing temperature and constant pressure. The density decreases with decreasing volume and constant temperature.

11 - What statement is correct with regard to change in temperature? During climb, the carrying gas warms due to thermal exchange with envorinmental air. During descent, the carrying gas warms adiabatically. During descent, the carrying gas warms due to thermal exchange with envorinmental air. During climb, the carrying gas warms adiabatically

12 - The standard state of gases refers to which temperature? 15° C 5° C 25° C 0° C

13 - What is the difference between a gas balloon at or below maximum differential pressure during climb? The balloon at maximum differential pressure climbs with constant rate to unlimited height. The balloon below maximum differential pressure climbs with constant rate up to maximum differential pressure height. The balloon below maximum differential pressure climbs with constant rate to unlimited height. The balloon at maximum differential pressure climbs with constant rate up to maximum differential pressure height.

14 - According ISA, what is the density of air at MSL? 1.225 g/m3 1225 kg/m3 1.225 kg/m3 12.25 kg/m3

15 - At which height the load carrying capability of a gas balloon is reduced by approximately 50% compared to MSL? At 6.500 m At 11.000 m At 18.000 m At 1.500 m

16 - What is the relationship between pressure and volume of a dry gas at constant temperature? The volume increases by a factor of 4 with double pressure The volume is inversely proportional to pressure The ration between pressure and volume is constant The volume increases proportional with pressure

17 - How does the norm height of a gas balloon with maximum differential pressure change, when its mass is reduced by 1%? Norm height increases by 800 m. Norm height decreases by 800 m. Norm height decreases by 80 m Norm height increases by 80 m.

18 - The ratio between air pressures at different heights is referred to as: Height value Pressure number Height ratio Height number

19 - The aerostatic lift corresponds to which force? The dynamic force due to airstream across the top of the hull The weight of the displaced air The drag due to airstream around the balloon envelope The weight of the balloon less ballast

20 - How do volume, density and temperature change when a gas is being compressed? Volume decreases, density increases, temperature increases. Volume decreases, density increases, temperature increases. Volume increases, density decreases, temperature decreases Volume decreases, density decreases, temperature decreases.

21 - With pressure and temperature given, any gas being heavier or lighter than air depends on what? On the content of water vapour in the gas On the mean kinetic energy of the molecules On the number of gas molecules On the molecule mass of the gas

22 - Below maximum differential pressure of a gas balloon, temperature increase of the carrying gas by 1K results in: Volume decrease by 0,4% Volume increase by 0,4% Volume increase by 4% Volume decrease by 4%

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

24 - With regard to gases, which statement is correct? Temperature decreases with increasing pressure and constant volume Volume increases with increasing temperature and constant pressure. Pressure decreases with increasing temperature and constant volume. Temperature increases with increasing volume and decreasing pressure.

25 - How does a gas react when released from a pressurized container? The gas heats adiabatically due to expansion The gas cools adiabatically due to expansion. The gas condenses inside the envelope The gas cools due to thermal contact with environmental air.

26 - What effect can sudden insolation from sunlight have on a gas balloon? The height at maximum differential pressure decreases. The height at maximum differential pressure increases. The hull pressure decreases. A sudden increase in rate of descent.

27 - How does the norm height of a gas balloon with maximum differential pressure change by dropping ballast? It increases by 8 m when total mass is reduced by 10%. It increases by 80 m when total mass is reduced by 1% It decreases by 8 m when total mass is reduced by 10%. It decreases by 80 m when total mass is reduced by 1%.

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