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

Question 1

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 decreasing volume and constant temperature.

Answer

The density decreases with increasing temperature and constant volume.

Question 2

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 3

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

Accepted Answer

Air density.

Answer

Shape of the envelope.

Answer

On the speed.

Answer

Balloon mass.

Question 4

Which of the following statements is correct?

Accepted Answer

The density of hull air is lower than environmental air only if the hull temperature is higher than environmental temperature

Answer

The density of hull air is lower with decreasing environmental pressure

Answer

The density of hull air is higher with increasing environmental pressure

Answer

The density of hull air is lower than environmental air only if the hull temperature is lower than environmental temperature

Question 5

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

Accepted Answer

Height number

Answer

Pressure number

Answer

Height value

Answer

Height ratio

Question 6

What cause may result in a reduction of volume of a free balloon?

Accepted Answer

A gust

Answer

Reduction in mass

Answer

Cooling of environment air

Answer

Increase in hull temperature

Question 7

The aerostatic lift corresponds to which force?

Accepted Answer

The weight of the displaced air

Answer

The weight of the balloon less ballast

Answer

The dynamic force due to airstream across the top of the hull

Answer

The drag due to airstream around the balloon envelope

Question 8

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 9

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 10

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

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

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