Quiz
Chapter 16
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Perguntas do quiz (47)
1Which of the following definitions of propeller parameters is correct?
- APropeller angle of attack is the angle between the chordline and the propeller vertical plane.
- BCritical tip velocity is the propeller speed at which the risk of flow separation at some parts of the blade occurs.
- CGeometric propeller pitch is the theoretical forward distance a propeller blade travels in one revolution.
- DBlade angle is the angle between the blade chordline and the propeller axis.
2The blade angle of attack of a fixed-pitch propeller increases when:
- Aforward speed and RPM decrease
- BRPM increases an forward speed decreases
- Cforward speed and RPM increase
- Dforward speed increases and RPM decreases
3Increasing the number of propeller blades will:
- Adecrease the torque of the propeller shaft at maximum power
- Bincrease the maximum power absorption
- Cnot affect the propeller efficiency
- Dincrease the noise level at maximum power
4Constant-speed propellers are more efficient than fixed-pitch propellers because they:
- Aproduce a higher maximum thrust than a fixed-pitch propeller
- Bhave more blades than a fixed-pitch propeller
- Cproduce an almost maximum efficiency over a greater speed range
- Dhave greater maximum efficiency than a fixed-pitch propeller
5Why is a propeller blade twisted from root to tip?
- ATo ensure that the root produces the greatest thrust.
- BTo ensure that the tip produces the greatest thrust.
- CBecause the blade angle of attack is dependent at any point on the rational of the rotational speed to the TAS.
- DBecause the blade angle of attack is dependent at any point on the ratio of the rotational speed to the propeller angular velocity.
6One of the advantages of increasing the number of propeller blades is:
- Aincreased noise
- Bless power is absorbed by the propeller
- Chigher tip speed
- Dimproved solidity
7How does the thrust of a fixed-pitch propeller vary during take-off run? The thrust:
- Aincreases slightly while the aeroplane builds up speed
- Bonly varies with mass changes
- Cis constant during the take-off and climb
- Ddecreases slightly while the areoplane builds up speed.
8Seen from behind a propeller rotates clockwise, the torque effect on take-off will:
- Aroll the aeroplane to the left
- Bpitch the areoplane nose-down
- Croll the aeroplane to the right
- Dpitch the aeroplane nose-up
9Which of the following statements regarding a constant-speed propeller is correct?
- AThe blade angle increases with increasing speed.
- BThe propeller system maintains the aeroplane at a constant speed.
- CThe RPM decreases with increasing aeroplane speed.
- DThe manifold pressure maintains the selected RPM.
10During a glide descent of a constant-speed propeller aeroplane at idle thrust and a constant speed, if the RPM lever is pulled back the propeller pitch will:
- Aincrease and the rate of descent will decrease
- Bincrease and the rate of descent will increase
- Cdecrease and the rate of descent will decrease
- Ddecrease and the rate of descent will increase
11During a glide descent of a constant-speed propeller aeroplane at idle thrust and a constant speed, if the RPM level is pushed forward the propeller pitch will:
- Adecrease and the rate of descent will decrease
- Bdecrease and the rate of descent will increase
- Cincrease and the rate of descent will decrease
- Dincrease and the rate of descent will increase
12Viewed from behind a propeller rotates clockwise, the asymmetric-blade effect in the climb will:
- Aroll the aeroplane to the right
- Byaw the areoplane to the left
- Croll the aeroplane to the left
- Dyaw the aeroplane to the left
13When the blades of a propeller are in the feathered position:
- Athe propeller produces an optimal windmilling RPM
- Bthe windmilling RPM is maximum
- Cthe RPM is just sufficient to lubricate the engine
- Dthe drag on the propeller is minimal
14During medium horizontal turbulence, the pitch angle of a constant-speed propeller alters:
- Aslightly
- Bstrongly
- Cnot at all
- Dif the pitch is fully fine
15The angle of attack for a propeller blade is the angle between the chordline and:
- Athe local airspeed vector
- Bthe direction of the propeller axis
- Cthe aeroplane heading
- Dthe principle direction of the propeller blade
16Gyroscopic precession of the propeller is induced by:
- Apitching and rolling
- Bincreasing RPM and yawing
- Cincreasing RPM and rolling
- Dpitching and yawing
17Propeller efficiency may be defined as the ratio between:
- Apropeller power and available and the shaft power
- Bthe thrust and the maximum thrust
- Cthe power available and the maximum power
- Dthe thermal power of fuel flow and the shaft power
18For a fixed-pitch propeller designed for the cruise, the angle of attack of each blade, measured at the reference section is:
- Alower in the ground run than in flight with the same RPM
- Balways positive during an idle descent
- Cis optimum when the aeroplane is in a stabilized cruise
- Ddecreased when the aeroplane speed is decreased at the same RPM
19In an idle-power glide at a constant IAS increasing the propeller pitch will (i)........the L/D ratio and (ii)........the rate of descent.
- A(i) decrease; (ii) decrease
- B(i) decrease; (ii) increase
- C(i) increase; (ii) decrease
- D(i) increase; (ii) increase
20Which of the following statements regarding propeller drag is correct.
An engine failure can result in the drag of (i) a windmilling propeller and (ii) a non-rotating propeller.- A(i) is equal to (ii)
- B(ii) is larger than (i)
- Cimpossible to say which is the largest
- D(i) is larger than (ii)
21Decreasing the propeller pitch during an idle-power descent at a constant IAS will cause the L/D ratio to (i) and rate of descent to (ii)........:
- A(i) increase; (ii) increase
- B(i) decrease; (ii) increasssssssse
- C(i) increase; (ii) decrease
- D(i) decrease; (ii) increase
22On a fixed-pitch propeller the angle of attack of the propeller is increased by (i)........RPM and (ii)........TAS:
- A(i) increased; increased
- B(i) increased; (ii) decreased
- C(i) decreased; (ii) decreased
- D(i) decreased; (ii) increased
23During a glide descent with the throttle closed and the engine idling if the propeller lever is pulled back on an aeroplane with a constant speed-propeller it will cause the rate of descent to (i)........and the RPM to........
- A(i) decease; (ii) increase
- B(i) decease; (ii) decrease
- C(i) increase; (ii) increase
- D(i) increase; (ii) decrease
24The purpose of increasing the number of blades on a propeller is:
- Ato improve the efficiency of the pitch control
- Bto increase the power absorption
- Cto reduce the size of the noise footprint
- Dto increase the maximum RPM
25Viewed from the front, an anti-clockwise rotating propeller during the take-off ground roll will produce a load (i)........on the (ii)........wheel due to (iii)........:
- A(i) increase; (ii) right; (iii) torque reaction
- B(i) decrease; (ii) right; (iii) gyroscopic effect
- C(i) increase; (ii) left; (iii) torque reaction
- D(i) decrease; (ii) left; (iii) gyroscopic effect
26During take-off the effect that the torque reaction of a clockwise rotating propeller (viewed from the behind) has on the left wheel load........(i) and the right wheel load........(ii) is:
- A(i) increased; (ii) constant
- B(i) constant; (ii) increased
- C(i) decreased; (ii) constant
- D(i) increased; (ii) decreased
27During a glide descent at idle thrust if the propeller pitch is decreased then the rate of descent will (i)........ and the lift/drag ratio will (ii)........:
- A(i) increase; (ii) increase
- B(i) increase; (ii) decrease
- C(i) decrease; (ii) increase
- D(i) decrease; (ii) decrease
28The gyroscopic effect of the propeller is effected by:
- Aroll and pitch
- Bdecreased blade angle
- Cincreased RPM
- Dincreased blade angle
29Which of the following definitions is correct regarding the propeller parameters?
- AThe propeller speed at which there is a risk of the airflow separating is the critical tip speed.
- BBlade angle of attack is the angle between the chordline and the propeller axis.
- CBlade angle is the angle between the chordline and the propeller axis.
- DGeometric propeller pitch is the theoretical forward distance travelled in one rotation.
30With regard to a constant-speed propeller:
- Apitch angle decreases with increasing TAS
- Bpitch angle increases with increasing TAS
- CRPM decreases with increasing TAS
- DRPM increases with increasing TAS
31Propeller efficiency is the ratio of:
- AThrust HP to overall HP
- BBrake HP to maximum thrust
- CThrust HP to shaft HP
- DShaft HP to overall HP
32The advantages of increasing the number of blades on a propeller is:
- Adecreased efficiency
- Bincreased noise
- Cincreased vibration
- Dincreased power absorption
33The effect of feathering a propeller is to:
- Aminimize the lift/drag ratio
- Bmaximize the windmilling speed
- Cimprove the thrust produced
- Dreduce the drag on the propeller to minimum
34During a glide with thrust at a constant IAS if the propeller pitch is decreased the left/drag ratio will:
- Adecrease
- Bincrease
- Cremain the same
- Dincrease when the CSU activates
35The effect of increasing the propeller pitch in a glide descent is that the L/D ratio (i)........and the rate of descent (ii)........
- A(i) increases; (ii) decreases
- B(i) increases; (ii) increases
- C(i) decreases; (ii) decreases
- D(i) decreases; (i) increases
36The asymmetric-blade effect of a clockwise rotating propeller (viewed from behind) during a climb is a:
- Ayaw to the left
- Broll to the left
- Croll to the right
- Dyaw to the right
37A propeller blade is twisted from root to tip because:
- Amaximum thrust is required from the tip
- Bmaximum thrust is required from the root
- Cthe local angle of attack is dependent on the TAS
- Dthe local angle of attack is dependent on the angular velocity
38During a power-off descent if the propeller RPM lever is pushed forward the propeller pitch (i)........and the rate of descent (ii)........
- A(i) decreases; (ii) decreases
- B(i) decreases; (ii) increases
- C(i) increases; (ii) increases
- D(i) increases; (ii) decreases
39The advantage of a constant-speed propeller overall fixed-pitch propeller is:
- Aincreased maximum available thrust
- Bincreased maximum efficiency
- Cit has a larger blade surface area
- Dnearly maximum efficiency over a greater speed range
40The drag of a windmilling propeller compared to that of a stationary propeller is that:
- Athe windmilling propeller has less drag
- Bthe windmilling propeller has more drag
- Cthey are the same
- Dit is impossible to determine
41In a glide descent increasing the propeller pitch (i)........ the L/D ratio and (ii)........rate of descent
- A(i) increases; (ii) increases
- B(i) decreases; (ii) decreases
- C(i) increases; (ii) decreases
- D(i) decreases; (ii) increases
42The angle of attack of a fixed-pitch propeller for a general-purpose aeroplane:
- Ais optimum during take-off
- Bdecreases with decreased speed at constant RPM
- Cis optimum in stabilized causing flight
- Dis less during the take-off ground run than in level flight
43The angle of attack of a propeller blade is the angle between the chord and the:
- ATAS vector
- Bplane of the axis and the propeller
- Caeroplane's course
- Drelative airflow
44During a constant speed IAS climb, in a normal atmosphere, with a fixed-pitch propeller the angle of attack of the propeller:
- Adecreases
- Bremains the same
- Cdiminishes to zero
- Dincreases
45In a glide descent increasing the propeller pitch (i)........ the L/D ratio and (ii)........rate of descent:
- A(i) increases; (ii) increases
- B(i) decreases; (ii) decreases
- C(i) decreases; (i) increases
- D(i) increases; (ii) decreases
46The advantage of a constant-speed propeller over a fixed-pitch propeller is:
- Anearly maximum efficiency over a greater speed range
- Bincreased maximum available thrust
- Cincreased maximum efficiency
- Dit has a larger blade surface area
47The torque of a clockwise turning propeller (when viewed from behind) produces a:
- Anose-up pitching moment
- Brolling moment to the left:
- Cnose-down pitching moment
- Drolling moment to the right
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- Autor
- Brendan Leisre
- Idioma
- English
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