Quiz
97. SEMANAS 2018
Questions in this quiz (32)
1Q1. When it is produced stagnation pressure losses in the inlets:
- AA. Increase thrust
- BB. Increase Specific Fuel Consumption
- CC. Decrease thrust
- DD. A and B are correct
2Q2. Mark the wrong answer:
- AGenerally, subsonic inlets are named “Pitot”
- BTypical parameters are NACA Serie 1 profiles
- CDrag is not due to inlet outer surface
- DThe shape is aerodynamically smooth
3Q3. Supersonic inlets can be:
- AA. 2D or spike
- BB. 3D or wedge
- CC. 2D or wedge
- DD. A and B are correct
4Q4. Which are the functions of compressors?
- AIncrease the pressure of the air mass received
- BTake the air to the combustion section
- CProvide bleed air for cabin pressure and other systems
- DAll are correct
5Q5. Which are the types of compressors? Choose the wrong answer:
- AA. Bi-directional
- BB. Axial
- CC. Centrifugal
- DD. B and C are right
6Q6. Which are the elements of centrifugal compressors? Choose the incorrect answer:
- ADiffuser
- BStabilizer
- CFront case
- DImpeller
7Q7. In centrifugal compressors, leaving the impeller the air passes into the diffuser section where the passages form
- ADivergent nozzles
- BConvergent nozzles
- CDivergent and convergent nozzles
- DNone of them
8Q8. Mark the incorrect option:
- ASingle-spool is a type of axial compressors
- BMulti-spool is a type of centrifugal compressors
- CGenerally, in aviation are used single-spool and two spools
- DMulti-spool is a type of axial compressors
9Q1. If the angle of attack of the rotor blades is too large...
- ABoundary layer can stall
- BWill cause transonic zones
- CCan cause heating problem
- DNothing can go wrong
10Q2. To ensure the working conditions for the compressor with different velocities via variable incident vanes... (Choose the wrong answer)
- AVariable IGV
- BVariable stator blades
- CThey close when velocity reduces
- DNone of the above
11Q3. A compression map...
- AA. Provides information of pressure ratio an equivalent flow for a throttle setting (IDLE-100%)
- BB. Does not give info relative to throttle settings
- CC. Gives info relative to weather conditions
- DD. Both A and C are correct
12Q4. Combustion Chambers... (choose the wrong answer)
- AEnsure stable fuel burn with max. Thermal efficiency in large conditions ranges
- BAre not used for aviation engines
- CMax temperature (850-1700oC) due to turbine materials
- DCombustion is initiated by an electric spark from an igniter plug
13Q5. Which is not a cooling method?
- ACorrugated strip cooling
- BMachined cooling ring
- CSplash cooling strip
- DCapsule icing allocation
14Q6. Types of combustion chambers...
- ATubular
- BTubo-annular
- CAnnular
- DAll the above
15Q7. Fuel Nozzle types...
- AVaporiser
- BAtomiser
- CBoth A and B are correct
- DBoth A and B are false
16Q8. Both impulse and reaction are energy transfer systems
- ATrue
- BFalse
17Q1. What are the different configuration of turbine?
- AA. Compressor
- BB. IMPULSE TURBINE
- CC. REACTION TURBINE
- DD. B and C
18Q2. What kind of engines are used nowadays in modern fighters?
- ATurbofan of low derivation
- BTurbofan of high derivation
- CPiston engines
- DStratojet
19Q3. Why the afterburner is an inefficient method to increase the thrust
- ABecause it implies more drag inside engine
- BIndeed, it is a really efficient method, especially in military aviation
- CBecause of increment in thrust, that is proportional to (Tpc)^1/2 / (T noPC)^1/2
- DBecause the increment in thrust follows a linear gradient, so that is not too much.
20Q4. Choose the correct answer
- AA. Afterburning provides the best method of thrust augmentation for short periods.
- BB. Afterburning provides the worst method of thrust augmentation for short periods.
- CC. Afterburning provides the best method of thrust augmentation for long periods.
- DD. Afterburning provides the worst method of thrust augmentation for long periods.
21Q5. Afterburning
- AA. It is a method of augmenting the basic thrust of an engine.
- BB. For military aircraft improve combat performance
- CC. It is the worst method of thrust augmentation for short periods.
- DD. A and B are correct
22Q6. How the use of afterburning affects the nozzle?
- AA. The nozzle expands
- BB. the nozzle contracts
- CC. the nozzle stays fixed
- DD. the nozzle opens and closes periodically
23Q7. What kind of Turbofans exist nowadays?
- AA. low derivation
- BB. high derivation
- CC. turboreactors
- DD. a and b are correct
24Q8. Turbofans of high derivation ratio are used in:
- ACommercial planes
- BFighters planes
- CNone of the above
- DHelicopters
25Q1. Which of these functions doesn ́t belong to the internal air system in engines?
- AControl of bearing axial loads
- BCooling the engine
- CMeasure the ground speed of the plane
- DEngine anti-icing
26Q2. The sealing functions are:
- APrevent oil leakage from engine bearing chambers
- BControl cooling airflows
- CPrevent ingress of the mainstream gas into turbine disc cavities
- DAll of the above
27Q3. Low compression airflow:
- AAvoid the formation of chemtrails
- BIt is used for cooling and pressurization
- CIs more powerful than high compression air flow
- DNone of them
28Q4. Accesory drives are cooled by:
- AVenturi effect
- BDe-icing systems
- CCooling oil
- DAll are wrong
29Q5. Fuel system can be used for:
- AControl of thrust
- BHydraulic controls of engine system
- COil cooling
- DAll are right
30Q6. What is the meaning of JP:
- AJames Patterson, the inventor of the fuel
- BJet Purpose
- CJet Propeller
- DNone of above
31Q7. What characteristics makes fuel so important for airlines.
- AIt is flamable and dangerous
- BIt isn ́t ecological
- CFuel isn ́t so important for aeronautic operators
- DIt represents almost a 40%, of the total cost, of a flight
32Q8. JP-8 is equivalent to:
- AJET A-1
- BB
- CAVCAT ( Aviation Carrier Turbine fuel)
- DGPA (General Purpose Aviation fuel)
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- Author
- Ismael Vázquez
- Language
- Español
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