Helicóptero

The fan in a high-bypass ratio turbofan engine produces about _____ percent of the total thrust. 75%. 90 %.

Two variables in the angle of attack of a propeller blade are: Engine RPM, forward speed of aircraft. Motor system.

The curve surface of a propeller blade is the. Back. Face.

The pitch angle and the angle of attack of a propeller blade________ the same. Are not. Are.

Propeller blade stations are measured in inche from the. Hub. Tip.

The actual distance a propeller advance in one revolution in the air is the. Effective. Geometric.

The difference between the geometric and Effective pitch of a propeller is called. Slip. Thrust.

The momentum theory states that the thrust produced by the propeller is determined by the change in the _____ of the air passing through the propeller multiplied by the _____ of the propeller disk. Momentum, area. Radio, blade.

Five factors that affect the amount of thrust produced by a propeller blade are: Shape of the airfoil section. Area of the blade. Angle of attack. Densy of the air. Speed of the blade through the air.

Two things that change on a propeller blade from the root to the tip are. Cross section of the blade and blade pitch angle. Clearence and left.

Increasing the engine RPM with the forward speed remaining constant ____ the angle of attack. Increases. Decreases.

The efficiency of the propeller is a measure of the radio of the _____ horsepower to the ____ horsepower. Thrust and torque. Centrifigal, speed.

Five forces acting on a propeller turning at a high speed are. Centrifugal force. Thrust bending force. Torque bending force. Aerodynamic twisting force. Centrifugal twisting force.

The greatest force acting on a propeller is_______ force. Centrifugal. Torque.

The force that tries to bend a propeller blade forward is the_____ bending. Thrust. Cft.

The force that tries to bend a propeller blade in its plane of rotation is the_____ bending force. Torque. Increase.

Aerodynamic twisting force (ATF) tries to ______ the blade angle. Increase. Decrease.

Centrifugal twisting force (CTF) tries to _____ the blade angle. Decrease. Increase.

The twisting force thas ha the greate affect on propeller operation is. ATF. CTF.

The critical engine on a twin-engine airplane, when both engines rotate in a clockwise direction (as viewed from the accessory end) is the______ engine. Left. Tip.

Two factors that limit the length of a propeller blade are the________ and ________ from the ground or structure. Tip speed and clearence. Decrease and ctf.

A fixed-pitch climb propeller has a_______pitch angle than a cruise propeller. Lower. Higher.

Centrifugal force acting on the counterweights on a two-position controllable-pitch propeller rotate the blade toward. High. Low.

The basic difference between a two-position controllable-pitch propeller and a constant-speed propeller is in the control. In a constant-speed propeller, a ______ replace the two-position valve. Governor. Birch.

Multiengine airplanes were made appreciably safer than their single-engine counterpart by the development of the_____ propeller. Feathering. 60.

The blade pitch angle when a propeller is feathered is near_____ degrees. 90. 60.

A reversible propeller is a constant-speed propeller whose_____ pitch stops can be released so the blades can be moved to an angle that produces thrust in the reverse direction. Low. High.

The wood used for most commercially made wood propellers is. Birch. Electrically.

Three holes are drilled into the tip of a wood propeller blade to release moisture and allow the wood to breathe. These holes are made with a number _____ drill. 60. 3.

Modern metal propellers are forged from high-strength______alloy, and after being ground to their finished dimensions and pitch, they are_____to protect them from corrosion. Aluminum and anedized. Metal and cobre.

The two types of propellers that are found on almost all modern airplane are. Fixed-pitch propeller, constant speed propeller. Torque and fixed.

The pitch on all modern constant-speed propellers is changed. Hydraulically. Electrically.

Two basic types of constant-speed propellers are. Counterweight. Noncounterweight. Centrifugal twisting.

The blade pitch of a noncounterweight constant-speed propeller is increased by two forces. These are. Oil pressure. Aerodynamic twisting force. Low.

The blade pitch of a noncounterweight constant-speed propeller is decreased by two forces. These are. Centrifugal twisting force. Internal spring. Decrease.

A flyweight-type propeller governor senses the_____compares it with the speed selected by the pilot, and causes the blade pitch to change to bring these two speeds together. Engine speed. Draining oil.

A counterweight nonfeathering propeller uses engine oil boosted by the governor to move the blades into a_____ pitch angle. Low. High.

A noncounterweight nonfeathering propeller uses engine oil boosted by the governor to move the blades into a _____ pich angle. High. Low.

The pilot can increase the RPM of the engine by______ the compression of the speeder spring in the propeller governor. Increasing. Decreasing.

The governor used with a Hydromatic propeller directs oil to the front side of the piston in the propeller dome to _____ the blade pitch. Decrease. Increase.

A Hydromatic propeller is feathered by oil from a/an _____ driven feathering pump. Electric-motor. Electric-sysmen.

If the engine-driven oil pump forces all of the oil available to it overboard, a Hydromatic propeller _____ be feathered. Can. Cannot.

A Hartzell steel hub feathering propeller is feathered by _____ the propeller. Directing oil into. Draining oil from.

Two forces that move the blades of a Hartzell steel hub feathering propeller into their feather position are: Centrifugal force on the counterweights. Force from a feathering spring. Counterweights. Torque.

If the engine loses oil pressure in flight, the blades of a Hartzell feathering propeller will move into their position. Feather. Low pich, normal high pitch.

The blades of a Hartzell feathering propeller are prevented from feathering when the engine is shut down on the ground by a/an ________ on each blade root contacting a spring-loaded high-pitch stop pin in the hub. High-pitch stop plate. Spring-loaded.

Some feathering propellers use an accumulator to speed up the action. Feathering. Unfeathering.

A McCauley feathering propeller is feathered by_______ the propeller. Draining oil from. Directing oil into.

The blades of a McCauley feathering propeller are prevented from feathering when the engine is shut down on the ground by a centrifugally actuated_______ pitch blade latches. Low. High.

The accumulator used with some McCauley propellers to speed up the unfeathering action is charged with engine oil whose pressure has been boosted by the pump in the. Governor. System.

Two basic types of turboprop engines are. Single-shaft. Free-turbine. Torque twisting. System power.

The two engine controls for a TPE331 engine are. Power lever. Condition, lever, speed. Speed. Egt indicatoe.

The RPM of a turboprop engine is controlled by the_____ lever. Power. Speed.

Four instruments used to monitor the performance of a turboprop engine are. Tachometer. Toquemeter. Fuel flowmeter. EGT indicador.

The maximum power a turboprop engine is allowed to produce at low altitude is normally limited by the. Airframe structure. Turbine inlet temperature.

The amount of torque a temperature-limited turboprop engine is allowed to produce _____ as the altitude increases. Decreases. Increases.

The two basic operating modes of a turboprop engine are. Beta mode. Alpha mode. Victor. Yanker.

Two forces that move the TPE331 propeller blades toward high pitch are. Counterweights. Feathering spring. Airframe spring.

The propeller on a TPE331 engine is feathered by directing oil _____ the propeller cylinder. Out of. Into.