Principles of Flight (Balloon) - BPL Gas Balloon Pilot Licence

Question 1

For a fully inflated gas balloon, what happens to its net lifting capacity when the lifting gas warms and excess gas is released, assuming unchanged envelope volume, ambient pressure and ambient temperature?

Accepted Answer

Load-bearing capability increases

Answer

Climb force decreases

Answer

Weight force increases

Answer

Lift force decreases

Question 2

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 3

A fully inflated gas balloon is in level equilibrium. Its mass is reduced by 1% and it rises to a new equilibrium while releasing gas. In a simplified model where a 1% pressure decrease corresponds to 80 m of height, what is the approximate change in equilibrium altitude?

Accepted Answer

Equilibrium altitude increases by 80 m

Answer

Equilibrium altitude increases by 800 m

Answer

Equilibrium altitude decreases by 800 m

Answer

Equilibrium altitude decreases by 80 m

Question 4

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

Accepted Answer

Volume decreases, density increases, temperature increases

Answer

Volume decreases, density increases, temperature decreases

Answer

Volume increases, density decreases, temperature decreases

Answer

Volume decreases, density decreases, temperature decreases

Question 5

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 6

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 7

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 8

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 9

What can solar heating of the lifting gas do to the pressure ceiling of a gas balloon before gas is released?

Accepted Answer

The pressure ceiling decreases

Answer

The pressure ceiling increases

Answer

The lifting gas always cools immediately

Answer

A sudden increase in rate of descent

Question 10

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

Exam questions Principles of Flight (Balloon) - BPL Gas Balloon Pilot Licence

BPL Gas Balloon Pilot Licence: Principles of Flight (Balloon) 10 Questions no time limit

Exam questions Principles of Flight (Balloon) - BPL Gas Balloon Pilot Licence

BPL Gas Balloon Pilot Licence: Principles of Flight (Balloon) 10 Questions no time limit

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