Exam quiz Aircraft General Knowledge - BPL Hot Air - Balloon Pilot License

Question 1

A true altitude is...

Accepted Answer

An altitude above mean sea level corrected for non-standard temperature

Answer

A height above ground level corrected for non-standard pressure

Answer

A height above ground level corrected for non-standard temperature

Answer

A pressure altitude corrected for non-standard temperature

Question 2

Why should a liquid gas bottle only be filled to 80% of its volume?

Accepted Answer

To provide space for temperature-induced expansion

Answer

Because temperature would get too high

Answer

Because it would get too heavy otherwise

Answer

To provide space for expansion in case of external cooling

Question 3

In which way may an altimeter subscale which is set to an incorrect QNH lead to an incorrect altimeter reading?

Accepted Answer

If the subscale is set to a higher than actual pressure, the indication is too high. This may lead to much closer proximity to the ground than intended

Answer

If the subscale is set to a lower than actual pressure, the indication is too high. This may lead to much closer proximity to the ground than intended

Answer

If the subscale is set to a lower than actual pressure, the indication is too low. This may lead to much closer proximity to the ground than intended

Answer

If the subscale is set to a higher than actual pressure, the indication is too low. This may lead to much greater heights above the ground than intended

Question 4

The electronic remote hull thermometer of a hot-air balloon is operating by which principle?

Accepted Answer

Resistance- / Semiconductor principle

Answer

Venturi principle

Answer

Boyle principle

Answer

Bernoulli principle

Question 5

Damages to the hot-air balloon hull fabric are most critical in which area?

Accepted Answer

At the top area

Answer

In the lower third

Answer

At the equator

Answer

In the apron area

Question 6

The term "static pressure" is defined as pressure...

Accepted Answer

Of undisturbed airflow

Answer

Sensed by the pitot tube

Answer

Inside the airplane cabin

Answer

Resulting from orderly flow of air particles

Question 7

The hull fabric of a hot-air balloon undergoes the most continuous thermal stress in which area?

Accepted Answer

At the top area

Answer

In the apron area

Answer

In the lower third

Answer

At the equator

Question 8

The carrying ropes of a hot-air balloon are made up from:

Accepted Answer

Stainless steel

Answer

Manila rope

Answer

Copper

Answer

Duralum

Question 9

Which is the purpose of the altimeter subscale?

Accepted Answer

To reference the altimeter reading to a predetermined level such as mean sea level, aerodrome level or pressure level 1013.25 hPa

Answer

To correct the altimeter reading for system errors

Answer

To set the reference level for the altitude decoder of the transponder

Answer

To adjust the altimeter reading for non-standard temperature

Question 10

Why should liquid gas bottles for hot-air balloons be transported upright?

Accepted Answer

To prevent damage on the riser tube

Answer

Because no other positions are approved

Answer

To prevent exiting of residual gas

Answer

To keep the armature panel clean

Question 11

The main burner is fed by which phase?

Accepted Answer

By the liquid phase

Answer

By the low-pressure phase

Answer

By the gas phase

Answer

By the plasma phase

Question 12

Which instrument can be affected by the hysteresis error?

Accepted Answer

Altimeter

Answer

Tachometer

Answer

Direct reading compass

Answer

Vertical speed indicator

Question 13

Which gas is heavier than air?

Accepted Answer

Propane

Answer

Hydrogen

Answer

Helium

Answer

Illuminating gas

Question 14

Under which conditions false readouts are possible on hull thermometers using radio communication from sensor to indicator panel?

Accepted Answer

When the sensor battery is almost empty

Answer

When radio messages are received

Answer

When the hull temperature exceeds 110 °C

Answer

When there is no intervisibility to temperature sensor

Question 15

A flight level is a...

Accepted Answer

Pressure altitude

Answer

True altitude

Answer

Density altitude

Answer

Altitude above ground

Question 16

During a flight in an air mass with a temperature equal to ISA and the QNH set correctly, the indicated altitude is...

Accepted Answer

Equal to the true altitude

Answer

Equal to the standard atmosphere

Answer

Lower than the true altitude

Answer

Higher than the true altitude

Question 17

The altimeter's reference scale is set to airfield pressure (QFE). What indication is shown during the flight?

Accepted Answer

Height above airfield

Answer

Pressure altitude

Answer

Altitude above MSL

Answer

Airfield elevation

Question 18

A vertical speed indicator connected to a too big equalizing tank results in...

Accepted Answer

Indication too high

Answer

No indication

Answer

Indication too low

Answer

Mechanical overload

Question 19

A pilot burner which is fed by the gas phase, works by which principle?

Accepted Answer

Bunsen principle

Answer

Electrostatic principle

Answer

Aerostatic principle

Answer

Aerodynamic principle

Question 20

Lower-than-standard temperature may lead to...

Accepted Answer

An altitude indication which is too high

Answer

An altitude indication which is too low

Answer

A correct altitude indication as long as the altimeter subscale is set to correct for non-standard temperature

Answer

A blockage of the Pitot tube by ice, freezing the altimeter indication to its present value

Question 21

The hull of a hot-air balloon is made up by which material?

Accepted Answer

Synthetic fabric

Answer

Silk fabric

Answer

Linen fabric

Answer

Cotton fabric

Question 22

With web-less balloon hulls, the load is connected to:

Accepted Answer

The load belt

Answer

The towing rope

Answer

The pull-rope

Answer

The basket rope

Question 23

The vapour pressure of propane gas in a bottle depends in particular on:

Accepted Answer

The temperature

Answer

The rigidity of the bottle

Answer

The size of the bottle

Answer

The gas amount

Question 24

The burning gas is pushed from the liquid gas phase through the riser tube to which component?

Accepted Answer

To the evaporator

Answer

To the pressure relief device

Answer

To the fill level indicator

Answer

To the controller

Question 25

Liquefaction of propane gas results in a reduction in volume to what fraction of the gas volume?

Accepted Answer

1/260

Answer

1/160

Answer

1/360

Answer

1/60

Question 26

What values are usually marked with a red line on instrument displays?

Accepted Answer

Operational limits

Answer

Caution areas

Answer

Recommended areas

Answer

Operational areas

Question 27

Which of the gases stated below is NOT made up from hydrocarbons?

Accepted Answer

Hydrogen

Answer

Propane

Answer

Butane

Answer

Methane

Question 28

The basket ropes of a hot-air balloon are usually fixed to ...

Accepted Answer

The burner cage

Answer

The burner

Answer

To the scoop

Answer

The Nomex apron

Question 29

During a flight in colder-than-ISA air the indicated altitude is...

Accepted Answer

Higher than the true altitude

Answer

Lower than the true altitude

Answer

Equal to the standard altitude

Answer

Equal to the true altitude

Question 30

The vertical speed indicator measures the difference of pressure between...

Accepted Answer

The present static pressure and the static pressure of a previous moment

Answer

The present dynamic pressure and the static pressure of a previous moment

Answer

The present total pressure and the total pressure of a previous moment

Answer

The present dynamic pressure and the dynamic pressure of a previous moment

Question 31

What is the purpose of the sounding pipe valve?

Accepted Answer

To indicate the volumetric filling limit

Answer

It allows pressure equalization during cruise at high altitude

Answer

It prevents air from entering the burner system

Answer

For venting the liquid gas container bottle

Question 32

About the lower end of the pull rope of a hot-air balloon it can be said:

Accepted Answer

It is particularly heat resistant

Answer

It has an especially smooth surface

Answer

It is fixed to the lower basket area

Answer

It has to be lubricated before every take-off

Question 33

What is the purpose of the vaporizer coils of the burner system?

Accepted Answer

To heat the liquid gas, so it will vaporize immediately after exiting the burner nozzle

Answer

To induce a rotation movement in the liquid gas to get a better mixture

Answer

For cooling of the liquid gas after exiting the burner nozzles

Answer

To vaporize the liquid gas, so it will be emitted from the burner nozzle in gaseous form

Question 34

The main blast valve is located where?

Accepted Answer

At the burner

Answer

At the main cylinder

Answer

At the hull equator

Answer

At the upper hull part

Question 35

What is indicated by a red line on the hull thermometer with an analog scale?

Accepted Answer

The maximum permissible value

Answer

The minimum permissible value

Answer

The take-off temperature

Answer

The recommended operating value

Question 36

The parapet height of a hot-air balloon basket is at least:

Accepted Answer

100 cm, in commercial operation 110 cm

Answer

80 cm, in commercial operation 100 cm

Answer

120 cm, in commercial operation 130 cm

Answer

110 cm, in commercial operation 110 cm

Question 37

A vertical speed indicator measures the difference between...

Accepted Answer

Instantaneous static pressure and previous static pressure

Answer

Dynamic pressure and total pressure

Answer

Total pressure and static pressure

Answer

Instantaneous total pressure and previous total pressure

Question 38

Which of the following options states the working principle of a vertical speed indicator?

Accepted Answer

Measuring the present static air pressure and comparing it to the static air pressure inside a reservoir

Answer

Total air pressure is measured and compared to static pressure

Answer

Static air pressure is measured and compared against a vacuum

Answer

Measuring the vertical acceleration through the displacement of a gimbal-mounted mass

Question 39

QFE is the...

Accepted Answer

Barometric pressure at a reference datum, typically the runway threshold of an airfield

Answer

Magnetic bearing to a station

Answer

Barometric pressure adjusted to sea level, using the international standard atmosphere (ISA)

Answer

Altitude above the reference pressure level 1013.25 hPa

Question 40

What is indicated by a yellow arc on the hull thermometer with an analog scale?

Accepted Answer

The cautious area

Answer

Maximum permissible values

Answer

Readability improvement

Answer

The normal operating area

Question 41

The measurement of altitude is based on the change of the...

Accepted Answer

Static pressure

Answer

Dynamic pressure

Answer

Differential pressure

Answer

Total pressure

Question 42

What amount of ignitable mixture can be made from 1 L (0.001 m3) liquid propane gas?

Accepted Answer

12 m3

Answer

0.38 m3

Answer

0.26 m3

Answer

1.2 m3

Question 43

Which parts of a hot-air balloon provide protection for the basket during landing?

Accepted Answer

Wearing strips

Answer

Wheels

Answer

Rubber pads

Answer

Steel runners

Question 44

The boiling point of propane gas at atmospheric conditions is:

Accepted Answer

- 42 °C

Answer

+ 5 °C

Answer

- 23 °C

Answer

0 °C

Question 45

The hull load of a hot-air balloon is carried by ...

Accepted Answer

The carrying ropes

Answer

By the towing ropes

Answer

By the top ropes

Answer

The fixing ropes

Exam simulation Aircraft General Knowledge - BPL Hot Air - Balloon Pilot License

Exam simulation Hot Air Balloon Exam Prep Aircraft General Knowledge 100 questions on 120 minutes