Principles of Flight (Aeroplane) - SPL - Sailplane Pilot License

Question 1

Considering longitudinal stability, which C.G. position is most dangerous with a normal sailplane?

Accepted Answer

Position beyond the rear C.G. limit

Answer

Position beyond the front C.G. limit

Answer

Position too far aside permissible C.G. limits

Answer

Position far back within permissible C.G. limits

Question 2

How is the balance of forces affected during a turn?

Accepted Answer

Lift force must be increased to compensate for the sum of centrifugal and gravitational force

Answer

A lower lift force compensates for a lower net force as compared to level flight

Answer

The horizontal component of the lift force during a turn is the centrifugal force

Answer

The net force results from superposition of gravity and centripetal forces

Question 3

When increasing the airflow speed by a factor of 2 while keeping all other parameters constant, how does the parasite drag change approximately?

Accepted Answer

It increases by a factor of 4

Answer

It decreases by a factor of 2

Answer

It increases by a factor of 2

Answer

It decreases by a factor of 4

Question 4

What has to be considered when operating a sailplane with water ballast?

Accepted Answer

It should stay below freezing level

Answer

Best glide angle decreases

Answer

Significant CG shifts

Answer

Best glide speed decreases

Question 5

Which point on the aerofoil is represented by number 4? See figure (PFA-009)

Accepted Answer

Separation point

Answer

Transition point

Answer

Stagnation point

Answer

Centre of pressure

Question 6

What leads to a decreased stall speed Vs (IAS)?

Accepted Answer

Decreasing weight

Answer

Lower density

Answer

Lower altitude

Answer

Higher load factor

Question 7

Bernoulli's equation for frictionless, incompressible gases states that...

Accepted Answer

Total pressure = dynamic pressure + static pressure

Answer

Total pressure = dynamic pressure - static pressure

Answer

Static pressure = total pressure + dynamic pressure

Answer

Dynamic pressure = total pressure + static pressure

Question 8

The aerodynamic rudder balance...

Accepted Answer

Reduces the control stick forces

Answer

Reduces the control surfaces

Answer

Delays the stall

Answer

Improves the rudder effectiveness

Question 9

With different aircraft weights, the critical angle of attack is...

Accepted Answer

Is not changed by different aircraft weights

Answer

Increases with a front centre of gravity

Answer

Is changed by different aircraft weights

Answer

Decreases with a rear centre of gravity

Question 10

In which way does the position of the centre of pressure move at a positively shaped profile with increasing angle of attack?

Accepted Answer

It moves forward until reaching the critical angle of attack

Answer

It moves to the wing tips

Answer

It moves backward until reaching the critical angle of attack

Answer

It moves forward first, then backward

Exam questions Principles of Flight (Aeroplane) - SPL - Sailplane Pilot License

SPL - Sailplane Pilot License: Principles of Flight (Aeroplane) 10 Questions no time limit

Exam questions Principles of Flight (Aeroplane) - SPL - Sailplane Pilot License

SPL - Sailplane Pilot License: Principles of Flight (Aeroplane) 10 Questions no time limit

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