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Questions in this quiz (74)
11. The reason to produce cilindric fuselage is:
- A-more space to store the load or passengers
- B-construction is easier compared with a squared fuselage
- C-to improve the distribution of the pressure due to the fuselage pressurization
- D-to produce a third (1/3) of the total aircraft’s lift
22. Cylindrical fuselages use less material than the squared fuselages because:
- A-the sphere has, for a given volume, less surface than a cube
- B-the sphere has, for a given volume, more surface than a cube
- C-the sphere has, for a given perimeter, less surface than a cube
- D-the sphere has, for a given surface, more perimeter than a cube
33. The angle of decrease of the back of a fuselage depends on:
- A-the load that is going to be transported
- B-the aircraft’s stall speed
- C-the boundary layer separation
- D-the passengers windows' position
44. Regarding double lobe fuselage:
- A-normally both the upper area and the lower are pressurized with the same pressurization system
- B-normally the upper area is pressurized with a different system than the lower area
- C-normally the upper area is the only area pressurized
- D-formers are not used
55. In order to transport big loads, the best option is:
- A-squared fuselage to use less material
- B-squared fuselage
- C-double lobe fuselage
- D-mid-wing structure
66. Regarding combat aircraft ́s fuselage:
- A-is conditioned by the fuel tank and the engine
- B-is a monocoque structure similar to boats structure
- C-it holds the missiles because all the fuel is hold inside the wings
- D-normally is a frame construction so as to fly transonic
77. Regarding semi-monocoque structures:
- A-longerons are used to avoid bending (pandeo) produced by big angles of attack
- B-vertical stabilizer are ensambled to the skin of the aircraft using screws
- C-longerons provide rigidity against flexion
- D-the skin is very thick so it is not used in aviation
88. Passenger cabin windows:
- A-are places where there is an acumulation of pressure
- B-filter air outside the aircraft
- C-are favorable to the structure design but not to aircraft aerodynamics
- D-are favorable to aircraft aerodynamics but not to the structure design
91. In commercial airplanes, how many sheets does each passenger ́s window have?
- Aa. Only a thin one, to be as light as possible.
- BTwo, separated by an air gap, and usually a third separated layer that is closest to the passenger that does not take any pressure load.
- CAt least two sheets together, to make sure the window is resistant enough against possible impacts.
- Dd. One laminated thick window to comply with all impact requirements.
10Which is the 90 sec rule?
- AAll the passengers must leave the aircraft using any of the doors of the plane
in 90 seconds. - BHalf of the passengers must leave the aircraft using any of the doors of the
plane in 90 seconds. - CAll the passengers must leave the aircraft using only the 50 % of the doors of the plane in 90 seconds.
- DThe crew of the airplane must be capable of opening all the doors in 90 seconds.
- AAll the passengers must leave the aircraft using any of the doors of the plane
11Which kind of wing structure is more adequate for commercial planes?
- ABraced monoplanes, because it can stand bigger tensile and compression
loads. - BCantilever monoplanes, thus saving a lot of fuel in comparison to braced monoplanes.
- CBraced monoplanes, thus saving a lot of fuel in comparison to cantilever monoplanes.
- DStringer monoplanes, which increases the aircraft ́s rigidity.
- ABraced monoplanes, because it can stand bigger tensile and compression
124. Where would you hang the engines in a commercial plane?
- Aa. From the winglets.
- Bb. From the ribs in the wings.
- Cc. From the stringer in the wings.
- Dd. From the front spar and the rear spar in the wings.
135. Why are ribs useful?
- Aa. They give shape to the wing.
- Bb. They brace the spar and support the skin and stringers.
- Cc. They spread the concentrated loads.
- Dd. All of the above.
146. What is the stresses that spars deal with?
- Aa. Torsion.
- Bb. Shear.
- Cc. Tension and compression.
- Dd. Those generated by the landing gear.
157. Stringers prevent buckling from happening.
- Aa. True
- Bb. False
168. Can the ribs present holes?
- Aa. Yes, in order to allow fuel to flow through them.
- Bb. Yes, because tensile stresses are better distributed this way.
- Cc. No, it would make ribs too fragile.
- Dd. No, ribs would then not be heavy enough.
171. How do we know the distance between the centers of the treads of the main gears?
- Aa) Base.
- Bb) Track.
- Cc) Bogies.
- Dd) Portal.
182. What is the base of the gear?
- Aa) Distance between the center of the tread of the auxiliary gear and the line joining
the main gears. - Bb) Distance between the center of the tread of the main gears.
- Cc) Distance between any of the wheels of the gear.
- Dd) Height of the main gear.
- Aa) Distance between the center of the tread of the auxiliary gear and the line joining
193. Who developed the dumper?
- Aa) Ford.
- Bb) Wright’s brothers.
- Cc) Breguet.
- Dd) None of above.
20In a plane with a tricycle gear, the centre of mass has to be:
- Aa) Outside of the triangle formed by the three wheels.
- Bb) Inside of the triangle formed by the three wheels.
- Cc) In the line joining the main gears.
- Dd) Exactly in the front wheel.
215. Which was the first wheeled landing gear plane?
- Aa) Breguet’s model.
- Bb) Santos-Dumont’s No14bis.
- Cc) Wright’s flyer.
- Dd) Gloster Meteor F8.
226. The functions of the gear are:
- Aa) Absorb landing loads and damp vibrations.
- Bb) Support the aircraft on the ground when taxiing and landing.
- Cc) Withstand side loads when landing and taxiing.
- Dd) All of above.
231) Which of the following are fluid power methods of transmitting power?
- Aa. Mechanical Methods
- Bb. Hydraulic Methods
- Cc. Pneumatic Methods
- Dd. B & C are correct
24Pascal’s Principle states that the pressure exerted anywhere in a confined incompressible fluid is transmitted equally in all directions throughout the fluid such that the pressure ratio remains the same:
- Aa. True
- Bb. False
253) The aileron controls which movement?
- Aa. Pitch
- Bb. Roll
- Cc. Yaw
- Dd. A & C are correct
264) Which of the following is not an advantage of hydraulic systems?
- Aa. Force amplification
- Bb. Accurate control of even hundredths of millimeters
- Cc. Complex design of the systems
- Dd. Lubrication is achieved by itself
275) Which of the following is correct?
- Aa. The pressure ratio in a compressor is higher than in a pump
- Bb. The pressure ratio in a compressor is the same than in a pump
- Cc. The pressure ratio in a compressor is lower than in a pump
- Dd. None of the above are correct
286) There are some hydraulic fluids that are able to achieve all of the desired properties:
- Aa. True
- Bb. False
297) The most common hydraulic fluid used in commercial aircrafts is:
- Aa. Vegetable Based
- Bb. Mineral Based
- Cc. They are all used equally
- Dd. Synthetic Base
30The working temperature for pneumatic systems is _____ compared to that of hydraulic systems:
- Aa. Lower
- Bb. Higher
- Cc. The same
- Dd. Higher because they are not limited by flammability of some oil-based fluids
319) If the hydraulic system fails, regarding the rum air turbine:
- Aa) There is no more hydraulic system, the rum air turbine stops working and therefore
the surfaces must be controlled mechanically. - Bb) C and D are correct.
- Cc) The rum air turbine gives small amounts of hydraulic fluid to the system and it allows
the surfaces to be controlled easier. - Dd) The rum air surface is an “emergency bomb”.
- Aa) There is no more hydraulic system, the rum air turbine stops working and therefore
3210) Regarding the hydraulic fuse:
- Aa) It detects sudden increases in flow and shuts off the fluid flow.
- Bb) It detects sudden decreases in flow and shuts off the fluid flow.
- Cc) It detects sudden increases in flow and allows the fluid flow.
- Dd) It does not control the fluid flow at all.
3311) The difference between the hydraulic system and the pneumatic system is that:
- Aa) The temperature of the fluid in the hydraulic system can be higher than the one of the
pneumatic system and a return valve is not needed. - Bb) The temperature of the fluid in the pneumatic system can be higher than the one of
the pneumatic system and a return valve is not needed. - Cc) Both systems reach the same temperature during the processes.
- Dd) The temperature of the systems is not important for the flight.
- Aa) The temperature of the fluid in the hydraulic system can be higher than the one of the
3412) Which statements are correct: regarding the pneumatic system, it is used for:
- Aa) Turbine engine start
- Bb) Water tank pressurization and toilet waste
- Cc) Control of vertical take off
- Dd) All of the above are correct
3513) Which of the following statements is an advantage of the pneumatic system? :
- Aa) There are no return lines, used air can be thrown to the atmosphere.
- Bb) Very high pressures are needed to move the mechanisms.
- Cc) Due to air compressibility, the pipes are of lower diameter in pneumatic systems than
in hydraulic. - Dd) A and C are correct.
3614) Bleed air comes from:
- Aa) In reciprocating engines from the turbocharger
- Bb) In reciprocating engines from the compressor
- Cc) In jet engines from the turbocharger
- Dd) None of the above
371. ¿When did fisrt started using the oxigen mask?
- Aa. World War 1
- Bb. World War 2
- Cc. 1960
- Dd. 1970
382. ¿What problem did the first pressurized airplanes had?
- Aa. Fatigue
- Bb. Broken Windows
- Cc. Hipoxia
- Dd. Despressurization
393. ¿How many termic loads supports an aircraft ?
- Aa. 3
- Bb. 2
- Cc. 5
- Dd. 7
404. In order to mantain the mínimum humidity in the cabin...
- AWe will use the lower limit of the dry bulb and the wet bulb
- BWe will use the lower limit of the dry bulb and the higher of the wet bulb
- CWe will use the higher limit of the dry bulb and the lower of the wet bulb
- DWe will use the higher limit of the dry bulb and the higher of the wet bulb
415. Commercial aviation is interested in:
- Aa. Maintain the minimum comfort temperature
- Bb. Maintain the maximum comfort temperature
- Cc. Maintain the minimum comfort temperature with the minimum humidity
- Dd. Maintain the minimum comfort temperature regardless of humidity
426. What was the disadvantage of the first heat exchangers used in aviation?
- Aa. They had poor thermal performance
- Bb. The pores produced by thermal fatigue let the exhaust gases pass, with the possibility of intoxication of the passage
- Cc. They had no disadvantage
- Dd. the performance of the engine worsened a lot
437. In air machines used in commercial aviation:
- Aa. The bleed air from the engine goes directly to the cabin
- Bb. The bleed air of the engine, after a cooling, goes directly to the cabin
- Cc. The bleed air of the engine, after a cooling and expansion, goes directly to the cabin
- Dd. Option C, but mixed with air directly from the bleed.
448. Droplet collectors are:
- Aa. Devices in charge of eliminating the drops of rain of the glasses of cabin
- Bb. Devices whose mission is to eliminate the drops coming from the condensation produced by the expansion of the cooling turbine air
- Cc. Devices that are part of the centrifugal water separator
- Dd. B and C are correct
4511. A bootstrap is usefull for:
- Aa. High pressures
- Bb. Low pressures
- Cc. High and low pressures
- Dd. None of both
4612. In water injection machines:
- Aa. Condensation is exothermal and absorbs heat
- Bb. Condensation is endothermal and cools the air
- Cc. Evaporation is exothermal and release heat
- Dd. Evaporation is endothermal and helps to cool
4713. Talking about the cabin conditioning:
- Aa. In commercial aviation the air is heated up
- Bb. At supersonic the air is heated up
- Cc. At supersonic the air is cooled
- Dd. A and C are correct
4814. In the fisrt pressurized systems: they were low pressurized because...
- Aa. Low weight
- Bb. Avoid explosive despressurization
- CConfort
- DA and B are true
4915. ¿Why is a dialectric liquid used in avionics refrigeration?
- Aa. It has less capacity of refrigeration
- Bb. To avoid shortcircuits (cortocircuitos)
- Cc. It is cheaper
- Dd. None of them are true
5016. The Wheatstone bridge:
- Aa. It is used to moderate the temperature
- Bb. It is used to moderate the hummidity
- Cc. It is used to moderate the pressure
- Dd. It is used to moderate the aire flow
511. With which aircraft system is the fuel system linked?
- A• With the hydraulic system
- B• With the airplane engine
- C• With the flight control system
- D• With the conditioning system
522. What is the problem with the fuel system of airplanes flying at high speeds?
- A• That the center of gravity and aerodynamics are displaced
- B• That the fuel moves to the outside of the wings
- C• That the fuel moves to the top of the wings
- D• That the fuel goes to higher pressure through the pipes of canalization
533. Why are fuel systems pressurized?
- A• To arrive with the proper pressure to the injectors
- B• To decrease the volume it occupies in the deposits
- C• To increase its temperature and make its inflammation easier
- D• Because if the fuel would not evaporate at high flight levels
544. In which part of the aircraft is the fuel usually stored?
- A• On the fuselage
- B• On the tail of the plane
- C• On the wings
- D• In the aircraft hold
555. What system was implemented in the 80s and serves to prevent the inflammation of fuel in the tanks of the plane?
- A• OBIGS
- B• Polyurethane foam
- C• The gaseous nitrogen inert system
- D• The HALON 1301
566. What else besides fuel supply is to take fuel on the plane?
- A• To increase the weight of the aircraft and therefore its stability
- B• To cool the oil and heat the fuel through heat exchangers
- C• To decrease the drag that slows the plane
- D• To thermally isolate the payment charge
577. What does the concept of "jettison" mean?
- A• It is done mostly after takeoff, when more fuel is carried by the plane
- B• It is the fact of throwing fuel as an emergency procedure
- C• It's about when we refuel in flight
- D• A and B are correct
588. What would happen if the chapeleta valves were not used in the fuel tanks of the wings of the aircraft?
- A• All fuel would go to the inside of the wings
- B• That the fuel would begin to oscillate the deposits producing malformations
- C• The airplane's center of gravity would be modified
- D• We would not be able to transfer fuel to the engine
599. What are the electric pumps that pump and increase the fuel pressure called?
- A• Injection pump
- B• Suction valve
- C• Ejection pump
- D• Booster pump
601. What is the use of the ditching button?
- Aa. It closes the valves below the aircraft’s water line to assist the plane in case of splashdown.
- Bb. It opens the valves to release pressure when the plane descent.
- Cc. It regulates ROD and ROC.
- Dd. It changes cabin levels in pneumatic pressure control system.
612. Is the change of pressure in an airplane the same in the ascent as in the descent?
- Aa. Yes, the ROC and the ROD have the same value.
- Bb. ROD >ROC.
- Cc. ROC >ROD.
- Dd. It depends if it’s regulated analogically or digitally.
623. The air for pressurization usually comes from...
- AThe turbine.
- BCompressors.
- CThe combustion system.
- DAirplanes have dedicated valves for pressurization air.
63What is the most common oxygen supply system?
- AThe MSOC (Molecular Sieve Oxygen Concentrators) system.
- BThe gaseous system carried in oxygen tanks.
- CLiquid oxygen.
- DNone of the above.
64When does misting occur?
- AIt occurs when the surface temperature of the transparency falls below the dew-point of the surrounding air.
- Bb. It typically occurs when an aircraft is passing an altitude where air is warmer.
- Cc. When the aircraft ascent into a warmer and more humid atmosphere
- Dd. A and C are corrects.
656. How does anti-misting system work?
- AThe gaseous system injects air in the cockpit.
- BCold air flow from the engine is injected in the cockpit.
- CWarm air flow from the engine is injected in the cockpit.
- DThere is a liquid for anti-misting.
66What is the higher value that ROD and ROC can achieve?
- A500 fpm and 300fpm.
- BThere is no minimum or maximum value for rate of change
- CROC> 500 fpm and ROD>300 fpm
- DIt depends if it is regulated via digital or analog regulators.
67What is the main problem of the pneumatic pressure control system?
- AUnanticipated stepped climb.
- BWhen descending negative differential values are common.
- CCabin pressure controller gives false values above 8000 ft.
- DPneumatic pressure control system normally fails when decompression.
681. Cable operated control elements, due to the great aerodynamic forces involved, are mainly used in:
- Aa) Small aircrafts.
- Bb) Big aircrafts.
- Cc) Fighter aircrafts.
- Dd) A, B and C options are correct.
692. Which is the function of the PCUs (Power Control Units):
- Aa) Unlocks control surfaces in case of hydraulic failure.
- Bb) Comunicates hydraulic forces to move control surfaces.
- Cc) A and B options are correct.
- Dd) Blocks the control surface movement.
703. Which of the following is a disadvantage of a electrical power assist system:
- Aa) High cost.
- Bb) Maintenance.
- Cc) Limited power.
- Dd) Durability.
714. In orders to move the control elements of an aircraft the systems used are:
- Aa) Cable operated control.
- Bb) Hydraulic power assist system.
- Cc) Electrical power assist system and option B.
- Dd) A, B and C options are correct.
725. In case if hydraulic failure, control surfaces cannot be locked due to:
- Aa) Release units.
- Bb) Interconnecting valves.
- Cc) Hydraulic liberation system.
- Dd) A and B options are correct.
736. Electrical power assist systems’ elements are (select the INCONRRECT option):
- Aa) Switch flight deck and Acting Rod.
- Bb) Horizontal and bank trim.
- Cc) Electric Motor and gear box.
- Dd) Screw jack.
74For the user of the aircraft to feel a force when deflecting the control surfaces, this artificial force can be:
- Aa) Proportional to air dynamic pressure.
- Bb) Proportional to flight control displacement.
- CA and B options are correct and the stick force gradient must return the control to the neutral position when pilot sets them free.
- DOnly B option is correct and the stick forcé gradient must return the control to the neutral position when pilot sets them free.
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- Quiz on RATA, created by Alejandro Olivas on 06/04/2019.
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- Alejandro Olivas
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