M17

What is the braking propeller condition?. The propeller gives a certain quantity of power to the engine, that is spent to win the drag and to slow down the airflow. The propeller gives a certain quantity of power to the engine, that is spent to win the drag and to accelerate the airflow. The propeller absorbs a certain quantity of power from the engine, that is spent to win the drag and to slow down the airflow.

On which surface you have the highest pressure on the propeller?. Forward surface. Is the same on both surfaces. Backword surface.

Which one is the correct formula used to evaluate the thrust in a propeller?. T=ρ·N2D2CT. T=N2D4CT. T=ρN2D4CT.

Which are the two basic parameters in a helix?. the angle of blade. the geometric pitch and the blade angle. only the pitch angle.

What is the effective pitch?. Is the real distance that propeller covers forward in one revolution. Is the ideal distance that propeller covers forward in one revolution. Is the real distance that propeller covers forward in half revolution.

What is N in the Renard equation for thrust (T=ρN²D⁴Ct)?. the wingspan. the surface area. the number of revolutions for second.

What is the tractor propeller condition?. It represent the normal operating condition of a propeller. In this case, the efficiency is negative. It represent the normal operating condition of a propeller. In this case, the efficiency is zero. It represent the normal operating condition of a propeller. In this case, the efficiency is positive.

How is defined the propulsive efficiency?. Is the product between propulsive power and engine power. Is the ratio between propulsive power and engine power. Is the ratio between engine power and propulsive power.

Which of the following quantities generates the thrust that moves forward the plane?. the aerodynamic force. the difference of pressure between the two side of propeller. the difference between the pressure of the nose of the aircraft and the pressure of the tail.

When the blade tips approach the speed of sound?. During cruise. During climb phase. During take-off.

Which one is the old classical configuration for propellers?. Two blades propeller. Four blades propeller. Three blades propeller.

When does a blocked propeller occur?. when the propeller absorbs from the airflow the required power to win the drag to the blade rotation. when the propeller works like a windmill. when the engine stops working for any reason.

What is the propulsive power?. Is the thrust times the velocity of the airplane. Is the ratio between the velocity of the airplane and the thrust. Is the ratio between the thrust and the velocity of the airplane.

What is the propeller slip?. Is the ratio between geometric pitch and effective pitch. Is the difference between geometric pitch and effective pitch. Is the product between geometric pitch and effective pitch.

Which is the analytical equation for thrust calculation?. T=ρ/(N²D⁴Ct). T=ρN²D⁴Ct. T=exp(ρN²D⁴Ct).

What is the reverse angle?. Is the possibility, for the adjustable-pitch propellers, to rotate the blades of a negative angle in order to produce the reverse thrust. Is the possibility, for the adjustable-pitch propellers, to rotate the blades of a positive angle in order to produce the reverse thrust. Is the possibility, for the fixed-pitch propellers, to rotate the blades of a negative angle in order to produce the reverse thrust.

How much is the variation of the blade area of a square tips propeller?. Decrease of 1-5%. Decrease of 5-10%. Increase of 5-10%.

Where the spinner is generally mounted?. Tractor type propeller. On both type. Pusher type propeller.

What is the spinner?. it is a device generally installed on Q-type propeller. it is a device that control the fuel flow in the engine. it is the aerodynamic cone at the hub of an aircraft propeller that protects the hub assembly and pitch change mechanism.

How many layers are considered the minimum number of layers to build a wooden propeller?. 5. 7. 9.

Why are aluminum alloys used instead of aluminum?. because they have low strength and high weight. because they have high strength and weight. because they have low strength and weight.

After the forging, how is shaped the aluminium propeller?. By extrusion. Using press-fusion method. By machine and manual grinding.

How many layers of wood are there in the wooden propeller?. a minimum of five layer of wood. two different wood layer. only one layer of wood.

Why the composite materials reduce centrifugal force in a propeller?. because they are flexible materials. because they are light materials. because they reduce fatigue-cycle.

How are secured removable blades of a propeller?. With a set of clamping rings. Through a threaded end. Using pins.

Which is the main characteristic of the mono-oriented fiber composites?. They have a specific resistance lower than all other materials. They have a specific resistance higher than wood but less than aluminium. They have a specific resistance higher than all other materials.

Where does the operating field work in the Beta range?. between flight fine pitch and flight coarse pitch. between flight fine pitch and reverse pitch. between reverse pitch and flight coarse pitch.

In alpha mode the speed governor is controlled by what?. Is controlled by the throttle lever for controlling the system rpm. Is controlled by the condition lever for controlling the system thrust. Is controlled by the condition lever for controlling the system rpm.

When is used flight coarse pitch?. during cruise at low flight speed. during cruise at high flight speed. basically in take off.

Which is the main advantage of constant-speed propellers?. they convert the low percentage of power produced by the engine in useful traction. they convert the high percentage of power produced by the engine in useful traction. they convert the high percentage of power produced by the engine in increase of RPM value.

How many methods are there for the actuation of the variable pitch system?. 2. 1. 3.

Which is the purpose of relief valve?. to protect the seals from low pressure. to protect the seals from high pressure. to protect the seals from change in pressure.