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WorksheetsAIR2530 Propellers Final Exam Review
Total questions: 70
Worksheet time: 27mins
What is the simplest of propeller design and is associated with many light and piston engine aircraft?
Air-Adjustable Propellers
Fixed-pitch propeller
Ground-Adjustable Propellers
Constant-Speed Propellers
Controllable-pitched propellers can be changed during flight while the aircraft propeller is still running.
True
False
Propellers that can change the pitch of a propeller from low to high pitch.
Controllable-Pitch Propellers
Ground-Adjustable Propellers
Two-Position Propellers
Fixed-Pitch Propellers
A disadvantage of a fixed pitch propeller is...
it has only one speed at which it reaches maximum efficiency
it has only one altitude at which it reaches maximum efficiency
it has only one temperature at which it reaches maximum efficiency
it has only one air density at which it reaches maximum efficiency
It is the theoretical distance a propeller should advance in one revolution along a helix, spiral, determined by its blade angle?
Geometric Pitch
Effective Pitch
Aerodynamic Twisting Moment
Centrifugal Twisting Moment
It is the force that attempts to bend the propeller blades forward at the tips, because thin blade flexes the thin blade sections forward?
Thrust Bending Force
Torque Bending Force
Centrifugal Force
It is a distance from the center of the propeller hub measured in inches?
Propeller index
Blade index
Blade Station
It is the imaginary line which extends from the leading to the trailing edge of a blade airfoil section?
Chord line
Hub Section
Axis of Symmetry
It is the actual distance forward that an aircraft actually moves in one revolution of the propeller?
Geometric Pitch
Effective Pitch
Aerodynamic Twisting Moment
Centrifugal Twisting Moment
What is the central portion of a propeller which is fitted to the engine crankshaft and carries the blades?
Leading Edge
Hub
Trailing Edge
Propeller Root
What force puts the greatest stress on a propeller as it tries to pull the blades out of the hub?
Torque bending Force
Centrifugal Force
Thrust Bending Force
What’s the angle of attack?
It is the angle between the profile chord line and the relative airflow towards it
It is the angle between the rotational plane of the propeller and the relative velocity
It is the angle between the propeller chord and the rotational plane
What’s the Blade Angle?
The angle between the propeller chord and the rotational plane of the propeller
The angle between the profile chord line and the relative air flow towards it
The angle between the rotational plane of the propeller and the relative velocity
The following types of propeller commonly have hydraulic pitch change mechanisms?
Constant speed propellers (pitch change from low (fine) to high (coarse) pitch) and Constant speed propellers with feathering and reverse (for turboprop engines)
Constant speed propellers with feathering position
All above.
What is the differences between the adjustable pitch propellers and variable pitch propellers?
No difference
Adjustable pitch propeller only can be changed on the ground when the engine is shut down and a variable pitch propeller the blade angle can be changed during operation
A Variable pitch propeller only can be changed on the ground when the engine is shut down and a Adjustable pitch propeller the blade angle can be changed during operation
Why must the propeller be moved into the feathering position when the engine is shut down during flight?
To provide as little drag as possible
To reduce pilot’s work load
To help keep the aircraft stable
To reduce the pitch as much as possible
What happens if the RPM of the propellers of a multiple-engine aircraft deviates slightly from each other?
This results in a difference of torque between engines
Airframe vibrations and occupant discomfort
Aircraft cannot keep stable during flight
What’s the function of synchronizing systems?
Synchronizing systems automatically match the torque of one or several engines to the torque of the master engine
Synchronizing systems automatically match the revolutions of one or several propellers to the RPM of the master engine
Synchronizing systems automatically matches the NH of one or several engines to the NH of the master engine
How many main methods are employed on propellers to prevent ice from forming on the propeller blades?
Two: Fluid anti−icing system and Electrical de−icing system
Only one: Electrical de−icing system
Two: Electrical de−icing system and Hot air anti-icing system
What is true about the geometry of the blade?
The geometry of the blade changes from the root to the tip.
The geometry of the blade changes from the leading edge to the trailing edge.
The geometry of the blade changes does not change.
What is the definition of blade angle?
Is the angle between the propeller chord and the profile chord line of the propeller.
Is the angle between the propeller chord and the relative air flow towards it
Is the angle between the propeller chord and the rotational plane of the propeller.
How to move the propeller out of the feathering position?
Produce oil pressure for the pitch change mechanism.
Increase the engine’s thrust.
Turn off the unfeathering pump.
What is true about feathering?
If the engine is shut down during flight, the propeller must be moved into the feathering position so that there is as little lift as possible.
If the engine is shut down during flight, the propeller must be moved into the feathering position so that there is as little drag as possible.
None of above is true.
For an aircraft fitted with a constant speed propeller:
pushing the propeller control lever forward will feather the propeller blades
pushing the throttle lever forward will increase the engine RPM
pushing the propeller control lever forward will decrease the engine RPM
pushing the propeller control lever forward will increase the engine RPM
Identify part A
Tip
Leading Edge
Trailing Edge
Root
Hub
Identify part D
Tip
Leading Edge
Trailing Edge
Root
Hub
Identify part E
Tip
Leading Edge
Trailing Edge
Root
Hub
Identify part A
Blade Face
Leading Edge
Trailing Edge
Root
Blade Back
Identify part B
Blade Face
Leading Edge
Trailing Edge
Root
Blade Back
Identify part C
Blade Face
Leading Edge
Trailing Edge
Root
Blade Back
Identify part D
Blade Face
Leading Edge
Trailing Edge
Root
Blade Back
Identify part A
Blade Angle
Plane of rotation
Nose of Plane
Longitudinal Axis
Blade Face
Identify part B
Blade Angle
Plane of rotation
Nose of Plane
Longitudinal Axis
Blade Face
There are two types of variable-pitch propellers – “adjustable” and “controllable”.
True
False
Aerodynamic thrust is produced from
Propellers converting RPM from the engine
Propellers converting rotational torque from the engine
Converting Dynamic Thrust
High blade angle is considered:
Coarse pitch
Feather
Flat pitch
Low propeller angle
What is a characteristic of the blade tip?
The blade angle is the same as the reference angle
While rotating, the airflow effect is the least
The blade angle is the largest
The blade angle is the smallest
A wooden propeller must have:
A steel insert
2 blades
5 laminates
Must be torque checked 50 hours after installation
Oil pressure is used to:
Increase pitch on a constant speed non-feathering propeller
Feather a feathering propeller
To come out of full reverse
Control the feather stop on a feathering propeller
Centrifugal latches:
Are actuated from the cockpit with the movement of the condition lever
Can be actuated from the cockpit
Are installed on all free turbine turboshaft propeller-driven aircraft
Prevent McCauley propellers from being feathered when shut down with centrifugal movment
Compact and feathering are associated with
Hartzell propellers
Are only found on splined propeller mounts
Are both reversing and feathering propellers
When a Hartzell compact hub loses oil pressure, it will:
Move into coarse pitch
Move into fine pitch
Lock in blade angle at the time of oil pressure loss
A pitch cylinder, an index pin or pitch cartridge in the hub are used on what type of propeller?
Hartzell feathering propeller
Flight adjustable Sensenich propeller
Variable pitch Sensenich propeller
Ground adjustable Sensenich propeller
Rotating cylinders on-ground adjustable propellers:
Are also adjustable in flight
Must be replaced for each blade angle required
Can be rotated for each blade angle required
Are required for each blade
What is one of the simplest of propellers to control?
Electrically controlled constant-speed propellers
Hydro-mechanical constant-speed propellers
Mechanical-servo full feathering propellers
Full-feathering, reversing constant speed propeller
What constant speed propeller can be installed on an engine with no oil provisions?
Electrically actuated constant speed propellers
Hydro-mechanical actuated constant speed propellers
Aluminum propellers
Non-feathering constant speed propellers
How is the oil delivered to the dome of a Q400 Dowty propeller?
Through a Beta tube from a PCU
By a single-acting hydraulic piston
Through the centre bore of the reduction gearbox
Through the over-speed governor
What propeller has the ability to change only one blade while installed?
Dowty Q400 propellers
Compact Dowty propellers
Aluminum fixed pitch propellers
Small McCauley propellers
What controls the Beta valve in reverse?
Power lever
Condition lever
Reverse lever
Topping governor
What does the Np gauge indicate?
Gas generator speed
Propeller speed
Propeller torque
Condition lever position
What is used to control and maintain the propeller RPM or pitch angle?
Topping governor
Beta valve
Over-speed governor
Propeller Governor
During the on-speed condition of a propeller, the
centrifugal force of the governor flyweights is
equal to the speeder spring force.
centrifugal force acting on the governor flyweights
is greater than the tension of the speeder
spring.
tension on the speeder spring is less than the centrifugal
force acting on the governor flyweights.
pilot valve is held against low pitch stop.
What actuates the pilot valve in the governor of a constant-
speed propeller?
Engine oil pressure.
Governor pump oil pressure.
Governor flyweights.
Speeder spring.
What action takes place when the cockpit control lever
for a hydromatic, constant-speed propeller is actuated?
Compression of the speeder spring is changed.
The governor bypass valve is positioned to direct
oil pressure to the propeller dome.
The governor booster pump pressure is varied.
The Over Speed Governor is armed.
What actuates the pilot valve in the governor of a constant-
speed propeller?
Engine oil pressure.
Governor pump oil pressure.
Governor flyweights.
Speeder spring.
Engine oil is used for:
Hydraulic fluid to actuate propeller pitch
Lubricate blade cuffs
Lubricate propeller attach bolts
The engine only
On most reciprocating multiengine aircraft, automatic
propeller synchronization is accomplished through the
actuation of the
Throttle levers.
Propeller control levers.
Propeller governors.
What indication will be observed when a propeller is not synchronized?
Spinning synchroscope
"Un-synchronized" lights for appropriate engine
Propeller not in synch vibrating appropriate indicator
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?
High pitch through low pitch to feather position.
Low pitch through reverse pitch to feather position.
High pitch through reverse pitch to feather position.
Low pitch through high pitch to feather position.
What is the range called that incorporates the flight fine pitch stop to the reverse pitch stop?
Beta range
Alpha range
Reverse Beta range
Auto-Alpha range
What can be said of the blade pitch when it is in reverse?
It is beyond fine pitch
It is in the Alpha range
It is in Alpha pitch
It is in pre-Beta pitch
What is the limiting characteristic of the propeller?
Tip speed
Altitude
Diameter
Chord width
What system almost functions like an autofeather system?
Negative Torque Sensing System
Beta Back Up and Feathering System
Constant Speed and Full Feathering System
Synchrophasing System
Ground running an aircraft with a fixed-pitch propeller with the nose into the wind causes the engine RPM to:
Increase
Decrease
Stay the same
Adjust with propeller governor input to condition lever setting
To measure the blade angle of a propeller
The blade station must be known
The propeller must be balanced
The blades must be indexed
It must be torqued onto a propeller flange
On an electric propeller de-ice system, what is the ammeter used for?
It will tell if the de-ice boots are functioning in the correct manner
The load of all the de-ice boots at once
The ammeter is for aircraft systems, de-ice boots are monitored by lights
Lighting the wings
What precaution must be observed when servicing a constant speed Hartzell propeller with grease?
One grease fitting must be removed
All grease fittings must be removed
Two grease fittings must be removed
The grease drain port must be opened
A reference torque is used to:
Check power output of a turboprop engine
Check maximum RPM of a turboprop engine
Check gas generator RPM
Check thrust
Ng is the indication of what RPM on a PT6?
Geared Propeller RPM
Free Turbine PRM
Propeller RPM
Gas Generator RPM
The simplest of propeller designs and is associated with many light, piston engine aircraft
Ground-Adjustable Propellers
Fixed-pitch propeller
Ground-Adjustable Propellers
Constant-Speed Propellers
