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

Exam simulation bpl-hot-air 100 questions on 120 minutes

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1 - At which conditions does the arm blower have the highest effeiciency? With as small distance to the balloon opening as possible. By evenly swiveling for better air spreading. By completely filling the balloon opening with the air beam. By placing the blower inside the hull.

2 - 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 decreasing volume and constant temperature. The density decreases with increasing temperature and constant volume. The density decreases with increasing temperature and constant pressure.

3 - The aerostatic lift corresponds to which force? The weight of the balloon less ballast 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

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

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

6 - What cause may result in a reduction of volume of a free balloon? Reduction in mass A gust Cooling of environment air Increase in hull temperature

7 - Which of the following statements is correct? The density of hull air is lower with decreasing environmental pressure The density of hull air is higher with increasing environmental pressure The density of hull air is lower than environmental air only if the hull temperature is lower than environmental temperature The density of hull air is lower than environmental air only if the hull temperature is higher than environmental temperature

8 - Which of the following statements is correct? At higher altitude, sink rate in case of cooling is increased due to less drag by less density. At higher altitude, sink rate by cooling is not increased because due to low density the mass inside the hull is also less. Higher drag at higher altitude prevents increased sink rate in case of cooling. Maximum sink rate must be equal at all altitudes as prescribed by design regulations.

9 - The final sinkrate of a hot-air ballon is achieved after descent over a vertical distance of: 1000 - 2000 m 50 - 100 m 250 - 450 m 500 - 1000 m

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

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

12 - What impact may rain have on operation of a hot-air balloon? Total mass and gas consumption increase Rain drops hitting on the hull reduce the lift force. The hull is deformed, which reduces lift. The hull is cooled, resulting in less gas consumption.

13 - Changing the shape of the envelope of a free balloon, e.g. by a gust, results in: Increase in lift. Decrease in volume Increase of displaced air. Decrease in weight.

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

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

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

17 - The increase in load carrying capability by increasing the hull air temperature by the same temperature difference ... Increases with balloon mass. Increases with altitude. Decreases with sinking. Decreases with altitude.

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

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

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

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

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

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

24 - What effect has an increase in air temperature inside the hull of a hot air balloon by a given difference in temperature? The increase in load carrying capacity increases with height. The increase in load carrying capacity decreases with height. The increase in rate of climb increases with height. The reduction in sink rate increases with height.

25 - If heating is stopped and the parachute vent is not activated, a hot air-balloon reaches a final sinkrate of approximately: 6 m/s 2 m/s 10 m/s 20 m/s

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

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

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