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

Question 1

With regard to gases, which statement is correct?

Accepted Answer

Volume increases with increasing temperature and constant pressure

Answer

Temperature increases with increasing volume and decreasing pressure

Answer

Temperature decreases with increasing pressure and constant volume

Answer

Pressure decreases with increasing temperature and constant volume

Question 2

Which of the following statements is correct?

Accepted Answer

At higher altitude, sink rate in case of cooling is increased due to less drag by less density

Answer

At higher altitude, sink rate by cooling is not increased because due to low density the mass inside the hull is also less

Answer

Higher drag at higher altitude prevents increased sink rate in case of cooling

Answer

Maximum sink rate must be equal at all altitudes as prescribed by design regulations

Question 3

What impact may rain have on operation of a hot-air balloon?

Accepted Answer

Total mass and gas consumption increase

Answer

Rain drops hitting on the hull reduce the lift force

Answer

The hull is deformed, which reduces lift

Answer

The hull is cooled, resulting in less gas consumption

Question 4

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 mean kinetic energy of the molecules

Answer

On the content of water vapour in the gas

Answer

On the number of gas molecules

Question 5

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

Accepted Answer

Climb force

Answer

Upper force

Answer

Lift force

Answer

Load force

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

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

Accepted Answer

Air density

Answer

Shape of the envelope

Answer

On the speed

Answer

Balloon mass

Question 8

How does a gas react when released from a pressurized container?

Accepted Answer

The gas cools adiabatically due to expansion

Answer

The gas cools due to thermal contact with environmental air

Answer

The gas heats adiabatically due to expansion

Answer

The gas condenses inside the envelope

Question 9

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

Accepted Answer

The upper pole

Answer

At the lower opening

Answer

At the center of the hull

Answer

At the equator

Question 10

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 proportional with pressure

Answer

The volume increases by a factor of 4 with double pressure

Answer

The ratio between pressure and volume is constant

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

BPL Hot Air - Balloon Pilot License: Principles of Flight (Balloon) 10 Questions no time limit

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

BPL Hot Air - Balloon Pilot License: Principles of Flight (Balloon) 10 Questions no time limit

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