Powerplant (Propellers) pt. 2 ⭐️

57問 • 1年前

問題一覧

The propeller governor controls the

oil to and from the pitch changing mechanism.

Which of the following statements about constant-speed counter weight ropellers is also true when referring to two-position counter weight propellers?

Blade angle changes are accomplished by the use of two forces, one hydraulic and the other centrifugal.

(1) During takeoff, propeller thrust (pull) is greatest if the blade angle of attack is low and the engine power setting is high. (2) With the aircraft stationary, propeller thrust is greatest if the blade angle of attack is high and the engine power setting is high. Regarding the above statements,

only No. 1 is true.

Which of the following best describes the blade movement of a propeller that is in the high RPM position when reversing action is begun?

Low pitch directly to reverse pitch.

During the on-speed condition of a propeller, the

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

Most engine-propeller combinations have one or more critical ranges within which continuous operation is not permitted. Critical ranges are established to avoid

severe propeller vibration.

Propeller blade station numbers increase from

hub center line to tip.

(1) A mechanic certificate with a powerplant rating authorizes the holder to repair deep scars, nicks, and dents on aluminum propeller blades. (2) A mechanic certificate with a powerplant rating authorizes the holder to perform minor straightening of steel propeller blades. Regarding the above statements,

neither No. 1 nor No. 2 is true.

Inspection of propeller blades by dye-penetrant inspection is accomplished to detect

cracks or other defects

Which of the following determines oil and grease specifications for lubrication of propellers?

Propeller manufacturers

Ice formation on propellers, when an aircraft is in flight, will

decrease thrust and cause excessive vibration.

What is indicated when the front cone bottoms while installing a propeller?

Rear cone should be moved forward.

The primary purpose of a cuff on a propeller is to

increase the flow of cooling air to the engine nacelle.

The centrifugal twisting force acting on a propeller blade is

greater than the aerodynamic twisting force and tends to move the blade to a lower angle.

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

increasing blade angle.

If propeller cones or hub cone seats show evidence of galling and wear, the most likely cause is

the propeller retaining nut was not tight enough during previous operation.

One of the advantages of inspecting an aluminum propeller utilizing dye penetrant inspection procedure is that

it shows whether visible lines and other marks are actually cracks rather than scratches.

The aerodynamic force acting on a rotating propeller blade operating at a normal pitch angle tends to

increase the pitch angle.

A fixed-pitch wooden propeller that has been properly installed and the attachment bolts properly torqued exceeds the out-of-track allowance by 1/16inch. The excessive out-of-track condition may be corrected by

placing shims between the inner flange and the propeller.

What is the basic purpose of the three small holes (No. 60 drill) in the tipping of wood propeller blades?

To allow the moisture which may collect between the tipping and the wood to escape (vent the tipping).

During which of the following conditions of flight will the blade pitch angle of a constant-speed propeller be the greatest?

High-speed, high-altitude cruising flight.

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

Overspeed.

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

High-speed and low-pitch angle.

In what position is the constant-speed propeller control placed to check the magnetos?

Full increase, low propeller blade pitch angle.

How is the oil pressure delivery on a hydromatic propeller normally stopped after the blades have reached their full-feathered position?

Electric cutout pressure switch.

Why is a constant-speed counterweight propeller normally placed in full HIGH PITCH position before the engine is stopped?

To prevent exposure and corrosion of the pitch changing mechanism.

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

effective pitch

Repairs of aluminum alloy adjustable pitch propellers are not permitted to be made on which of the following propeller blade areas?

Shank

What is the primary purpose of the metal tipping which covers the blade tips and extends along the leading edge of each wood propeller blade?

To prevent impact damage to the tip and leading edge of the blade.

Geometric pitch of a propeller is defined as the

effective pitch plus slippage.

During operational check of an aircraft using hydromatic full-feathering propellers, the following observations are made: The feather button, after being pushed, remains depressed until the feather cycle is complete, then opens. When unfeathering, it is necessary to manually hold the button down until unfeathering is accomplished.

Both feather cycle and unfeather cycle are functioning properly.

Propeller blade angle is the angle between the

chord of the blade and the rotational plane of the propeller.

What controls the constant-speed range of a constant-speed propeller?

The mechanical limits in the propeller pitch range.

When preparing a propeller blade for inspection it should be cleaned with

mild soap and water

How is aircraft electrical power for propeller deicer systems transferred from the engine to the propeller hub assembly?

By slip rings and brushes.

What is the result of moving the throttle on a reciprocating engine when the propeller is in the constant-speed range with the engine developing cruise power?

Opening the throttle will cause an increase in blade angle.

Propeller fluid anti-icing systems generally use which of the following?

Isopropyl alcohol

A constant-speed propeller provides maximum efficiency by

adjusting blade angle for most conditions encountered in flight.

Which of the following defects is cause for rejection of wood propellers?

An oversize hub or bolt hole, or elongated bolt holes.

When lubricating a Hartzell propeller blade with grease, to prevent damage to the blade seals, the service manual may recommend on some models to

remove one of the two zerk fittings for the blade and grease the blade through the remaining fitting.

What method would be used to inspect an aluminum propeller blade when a crack is suspected?

Dye-penetrant

Apparent engine roughness is often a result of propeller unbalance. The effect of an unbalanced propeller will usually be

greater at high RPM

Manually feathering a hydro mechanical propeller means to

port governor oil pressure from the cylinder of the propeller.

The low pitch stop on a constant-speed propeller is usually set so that

the engine will turn at its rated takeoff RPM at sea level when the throttle is opened to allowable takeoff manifold pressure.

Which of the following best describes the blade movement of a feathering propeller that is in the HIGH RPM position when the feathering action is begun?

Low pitch through high pitch to feather position.

Which of the following occurs to cause front cone bottoming during propeller installation?

The front cone contacts the ends of the shaft splines, preventing the front and rear cones from being tightened against the cone seats in the propeller hub.

How does the aerodynamic twisting force affect operating propeller blades?

It tends to turn the blades to a high blade angle.

What normally prevents a Hartzell Compact propeller from going to feather when the engine is shut down on the ground?

A latch mechanism composed of springs and lock pins.

Oil leakage around the rear cone of a hydromatic propeller usually indicates a defective

spider-shaft oil seal

The thrust produced by a rotating propeller is a result of

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

What will happen to the propeller blade angle and the engine RPM if the tension on the propeller governor control spring (speeder spring) is increased?

Blade angle will decrease and RPM will increase.

Which of the following is identified as the cambered or curved side of a propeller blade, corresponding to the upper surface of a wing airfoil section?

Blade back

When running-up an engine and testing a newly installed hydromatic propeller, it is necessary to exercise the propeller by moving the governor control through its entire travel several times to

free the dome of any entrapped air.

Maximum taper contact between crankshaft and propeller hub is determined by using

bearing blue color transfer

The holding coil on a hydroniatic propeller feathering button switch holds a solenoid relay closed that applies power to the propeller

feathering pump motor

How is a propeller controlled in a large aircraft with a turboprop installation?

By the engine power lever.

The application of more protective coating on one blade than the other when refinishing a wood propeller

may be necessary to achieve final balancing.

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Powerplant (Propellers) pt. 1 ⭐️

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10問 • 1年前

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78問 • 1年前

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問題一覧

The propeller governor controls the

oil to and from the pitch changing mechanism.

Which of the following statements about constant-speed counter weight ropellers is also true when referring to two-position counter weight propellers?

Blade angle changes are accomplished by the use of two forces, one hydraulic and the other centrifugal.

only No. 1 is true.

Which of the following best describes the blade movement of a propeller that is in the high RPM position when reversing action is begun?

Low pitch directly to reverse pitch.

During the on-speed condition of a propeller, the

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

Most engine-propeller combinations have one or more critical ranges within which continuous operation is not permitted. Critical ranges are established to avoid

severe propeller vibration.

Propeller blade station numbers increase from

hub center line to tip.

neither No. 1 nor No. 2 is true.

Inspection of propeller blades by dye-penetrant inspection is accomplished to detect

cracks or other defects

Which of the following determines oil and grease specifications for lubrication of propellers?

Propeller manufacturers

Ice formation on propellers, when an aircraft is in flight, will

decrease thrust and cause excessive vibration.

What is indicated when the front cone bottoms while installing a propeller?

Rear cone should be moved forward.

The primary purpose of a cuff on a propeller is to

increase the flow of cooling air to the engine nacelle.

The centrifugal twisting force acting on a propeller blade is

greater than the aerodynamic twisting force and tends to move the blade to a lower angle.

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

increasing blade angle.

If propeller cones or hub cone seats show evidence of galling and wear, the most likely cause is

the propeller retaining nut was not tight enough during previous operation.

One of the advantages of inspecting an aluminum propeller utilizing dye penetrant inspection procedure is that

it shows whether visible lines and other marks are actually cracks rather than scratches.

The aerodynamic force acting on a rotating propeller blade operating at a normal pitch angle tends to

increase the pitch angle.

placing shims between the inner flange and the propeller.

What is the basic purpose of the three small holes (No. 60 drill) in the tipping of wood propeller blades?

To allow the moisture which may collect between the tipping and the wood to escape (vent the tipping).

During which of the following conditions of flight will the blade pitch angle of a constant-speed propeller be the greatest?

High-speed, high-altitude cruising flight.

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

Overspeed.

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

High-speed and low-pitch angle.

In what position is the constant-speed propeller control placed to check the magnetos?

Full increase, low propeller blade pitch angle.

How is the oil pressure delivery on a hydromatic propeller normally stopped after the blades have reached their full-feathered position?

Electric cutout pressure switch.

Why is a constant-speed counterweight propeller normally placed in full HIGH PITCH position before the engine is stopped?

To prevent exposure and corrosion of the pitch changing mechanism.

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

effective pitch

Repairs of aluminum alloy adjustable pitch propellers are not permitted to be made on which of the following propeller blade areas?

Shank

What is the primary purpose of the metal tipping which covers the blade tips and extends along the leading edge of each wood propeller blade?

To prevent impact damage to the tip and leading edge of the blade.

Geometric pitch of a propeller is defined as the

effective pitch plus slippage.

Both feather cycle and unfeather cycle are functioning properly.

Propeller blade angle is the angle between the

chord of the blade and the rotational plane of the propeller.

What controls the constant-speed range of a constant-speed propeller?

The mechanical limits in the propeller pitch range.

When preparing a propeller blade for inspection it should be cleaned with

mild soap and water

How is aircraft electrical power for propeller deicer systems transferred from the engine to the propeller hub assembly?

By slip rings and brushes.

What is the result of moving the throttle on a reciprocating engine when the propeller is in the constant-speed range with the engine developing cruise power?

Opening the throttle will cause an increase in blade angle.

Propeller fluid anti-icing systems generally use which of the following?

Isopropyl alcohol

A constant-speed propeller provides maximum efficiency by

adjusting blade angle for most conditions encountered in flight.

Which of the following defects is cause for rejection of wood propellers?

An oversize hub or bolt hole, or elongated bolt holes.

When lubricating a Hartzell propeller blade with grease, to prevent damage to the blade seals, the service manual may recommend on some models to

remove one of the two zerk fittings for the blade and grease the blade through the remaining fitting.

What method would be used to inspect an aluminum propeller blade when a crack is suspected?

Dye-penetrant

Apparent engine roughness is often a result of propeller unbalance. The effect of an unbalanced propeller will usually be

greater at high RPM

Manually feathering a hydro mechanical propeller means to

port governor oil pressure from the cylinder of the propeller.

The low pitch stop on a constant-speed propeller is usually set so that

the engine will turn at its rated takeoff RPM at sea level when the throttle is opened to allowable takeoff manifold pressure.

Which of the following best describes the blade movement of a feathering propeller that is in the HIGH RPM position when the feathering action is begun?

Low pitch through high pitch to feather position.

Which of the following occurs to cause front cone bottoming during propeller installation?

The front cone contacts the ends of the shaft splines, preventing the front and rear cones from being tightened against the cone seats in the propeller hub.

How does the aerodynamic twisting force affect operating propeller blades?

It tends to turn the blades to a high blade angle.

What normally prevents a Hartzell Compact propeller from going to feather when the engine is shut down on the ground?

A latch mechanism composed of springs and lock pins.

Oil leakage around the rear cone of a hydromatic propeller usually indicates a defective

spider-shaft oil seal

The thrust produced by a rotating propeller is a result of

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

What will happen to the propeller blade angle and the engine RPM if the tension on the propeller governor control spring (speeder spring) is increased?

Blade angle will decrease and RPM will increase.

Which of the following is identified as the cambered or curved side of a propeller blade, corresponding to the upper surface of a wing airfoil section?

Blade back

When running-up an engine and testing a newly installed hydromatic propeller, it is necessary to exercise the propeller by moving the governor control through its entire travel several times to

free the dome of any entrapped air.

Maximum taper contact between crankshaft and propeller hub is determined by using

bearing blue color transfer

The holding coil on a hydroniatic propeller feathering button switch holds a solenoid relay closed that applies power to the propeller

feathering pump motor

How is a propeller controlled in a large aircraft with a turboprop installation?

By the engine power lever.

The application of more protective coating on one blade than the other when refinishing a wood propeller

may be necessary to achieve final balancing.