Propellers Chapter 7 FAA Powerplant (25 questions)

The angle of attack of a propeller blade is the difference between its:

chord line and the relative wind

A propeller typically produces its greatest amount of thrust at which pitch angle?

30º

Geometric pitch of a propeller is defined as:

effective pitch plus slippage

The actual distance a propeller moves forward through the air during one revolution is known as the:

effective pitch

Blade angle is an angle formed by a line perpendicular to the crankshaft and a line formed by the:

chord of the blade

Propeller blade station numbers increase from:

hub center line to tip

The physical force which creates the largest amount of stress on a propeller is absorbed by which section of the propeller?

The propeller hub

What operational force causes propeller blade tips to lag in the opposite direction of rotation?

Torque Bending

What operational force tends to bend the propeller blades forward at the tips?

Thrust Bending Force

How does the aerodynamic twisting force affect operating propeller blades?

It tends to turn the blades to a high blade angle

The centrifugal twisting force of an operating propeller tends to:

reduce the pitch angle

The angle of attack of a rotating propeller blade is measured between the blade chord or face and which of the following?

Relative airstream

The thrust produced by rotating a propeller is a result of:

an area of decreased pressure immediately in front of the propeller blades

What is the purpose of a test club?

To identify harmonics produced by an engine/propeller combination

What are the rotational speed and blade pitch angle requirements of a constant-speed propeller during takeoff?

High speed and low pitch angle.

A constant-speed propeller provides maximum efficiency by:

adjusting blade angle for most conditions encountered in flight

Counterweights on constant-speed propellers are generally used to aid in:

increasing blade angle

In case of an engine failure, what holds a feathering propeller in the feathered position while in flight?

Aerodynamic force

How do small feathering propellers prevent feathering when the engine is shut down?

Latches lock the propeller in low pitch to prevent excess load on the engine at start-up

Reverse pitch propellers:

produce a negative blade angle to slow the aircraft after touchdown

The propeller governor cockpit control:

adjusts tension on the speeder spring

During the on-speed condition of a propeller, the:

centrifugal force of the governor flyweights is equal to the speeder spring tension

When the centrifugal force acting on the propeller governor flyweights overcomes the tension on the speeder spring, a propeller is in what speed condition?

Over-speed

A fixed pitch metal propeller is stamped with the model number 1B50-CM-71-44. What does the CM stand for?

The type of hub to which it may be mounted

What normally prevents a constant speed feathering propeller from going into feather when the engine is shut down on the ground?

Latching mechanisms