97. SEMANAS 2018

Ismael Vázquez
Quiz by Ismael Vázquez, updated more than 1 year ago
Ismael Vázquez
Created by Ismael Vázquez over 2 years ago
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Question 1

Question
Q1. When it is produced stagnation pressure losses in the inlets:
Answer
  • A. Increase thrust
  • B. Increase Specific Fuel Consumption
  • C. Decrease thrust
  • D. A and B are correct

Question 2

Question
Q2. Mark the wrong answer:
Answer
  • Generally, subsonic inlets are named “Pitot”
  • Typical parameters are NACA Serie 1 profiles
  • Drag is not due to inlet outer surface
  • The shape is aerodynamically smooth

Question 3

Question
Q3. Supersonic inlets can be:
Answer
  • A. 2D or spike
  • B. 3D or wedge
  • C. 2D or wedge
  • D. A and B are correct

Question 4

Question
Q4. Which are the functions of compressors?
Answer
  • Increase the pressure of the air mass received
  • Take the air to the combustion section
  • Provide bleed air for cabin pressure and other systems
  • All are correct

Question 5

Question
Q5. Which are the types of compressors? Choose the wrong answer:
Answer
  • A. Bi-directional
  • B. Axial
  • C. Centrifugal
  • D. B and C are right

Question 6

Question
Q6. Which are the elements of centrifugal compressors? Choose the incorrect answer:
Answer
  • Diffuser
  • Stabilizer
  • Front case
  • Impeller

Question 7

Question
Q7. In centrifugal compressors, leaving the impeller the air passes into the diffuser section where the passages form
Answer
  • Divergent nozzles
  • Convergent nozzles
  • Divergent and convergent nozzles
  • None of them

Question 8

Question
Q8. Mark the incorrect option:
Answer
  • Single-spool is a type of axial compressors
  • Multi-spool is a type of centrifugal compressors
  • Generally, in aviation are used single-spool and two spools
  • Multi-spool is a type of axial compressors

Question 9

Question
Q1. If the angle of attack of the rotor blades is too large...
Answer
  • Boundary layer can stall
  • Will cause transonic zones
  • Can cause heating problem
  • Nothing can go wrong

Question 10

Question
Q2. To ensure the working conditions for the compressor with different velocities via variable incident vanes... (Choose the wrong answer)
Answer
  • Variable IGV
  • Variable stator blades
  • They close when velocity reduces
  • None of the above

Question 11

Question
Q3. A compression map...
Answer
  • A. Provides information of pressure ratio an equivalent flow for a throttle setting (IDLE-100%)
  • B. Does not give info relative to throttle settings
  • C. Gives info relative to weather conditions
  • D. Both A and C are correct

Question 12

Question
Q4. Combustion Chambers... (choose the wrong answer)
Answer
  • Ensure stable fuel burn with max. Thermal efficiency in large conditions ranges
  • Are not used for aviation engines
  • Max temperature (850-1700oC) due to turbine materials
  • Combustion is initiated by an electric spark from an igniter plug

Question 13

Question
Q5. Which is not a cooling method?
Answer
  • Corrugated strip cooling
  • Machined cooling ring
  • Splash cooling strip
  • Capsule icing allocation

Question 14

Question
Q6. Types of combustion chambers...
Answer
  • Tubular
  • Tubo-annular
  • Annular
  • All the above

Question 15

Question
Q7. Fuel Nozzle types...
Answer
  • Vaporiser
  • Atomiser
  • Both A and B are correct
  • Both A and B are false

Question 16

Question
Q8. Both impulse and reaction are energy transfer systems
Answer
  • True
  • False

Question 17

Question
Q1. What are the different configuration of turbine?
Answer
  • A. Compressor
  • B. IMPULSE TURBINE
  • C. REACTION TURBINE
  • D. B and C

Question 18

Question
Q2. What kind of engines are used nowadays in modern fighters?
Answer
  • Turbofan of low derivation
  • Turbofan of high derivation
  • Piston engines
  • Stratojet

Question 19

Question
Q3. Why the afterburner is an inefficient method to increase the thrust
Answer
  • Because it implies more drag inside engine
  • Indeed, it is a really efficient method, especially in military aviation
  • Because of increment in thrust, that is proportional to (Tpc)^1/2 / (T noPC)^1/2
  • Because the increment in thrust follows a linear gradient, so that is not too much.

Question 20

Question
Q4. Choose the correct answer
Answer
  • A. Afterburning provides the best method of thrust augmentation for short periods.
  • B. Afterburning provides the worst method of thrust augmentation for short periods.
  • C. Afterburning provides the best method of thrust augmentation for long periods.
  • D. Afterburning provides the worst method of thrust augmentation for long periods.

Question 21

Question
Q5. Afterburning
Answer
  • A. It is a method of augmenting the basic thrust of an engine.
  • B. For military aircraft improve combat performance
  • C. It is the worst method of thrust augmentation for short periods.
  • D. A and B are correct

Question 22

Question
Q6. How the use of afterburning affects the nozzle?
Answer
  • A. The nozzle expands
  • B. the nozzle contracts
  • C. the nozzle stays fixed
  • D. the nozzle opens and closes periodically

Question 23

Question
Q7. What kind of Turbofans exist nowadays?
Answer
  • A. low derivation
  • B. high derivation
  • C. turboreactors
  • D. a and b are correct

Question 24

Question
Q8. Turbofans of high derivation ratio are used in:
Answer
  • Commercial planes
  • Fighters planes
  • None of the above
  • Helicopters

Question 25

Question
Q1. Which of these functions doesn ́t belong to the internal air system in engines?
Answer
  • Control of bearing axial loads
  • Cooling the engine
  • Measure the ground speed of the plane
  • Engine anti-icing

Question 26

Question
Q2. The sealing functions are:
Answer
  • Prevent oil leakage from engine bearing chambers
  • Control cooling airflows
  • Prevent ingress of the mainstream gas into turbine disc cavities
  • All of the above

Question 27

Question
Q3. Low compression airflow:
Answer
  • Avoid the formation of chemtrails
  • It is used for cooling and pressurization
  • Is more powerful than high compression air flow
  • None of them

Question 28

Question
Q4. Accesory drives are cooled by:
Answer
  • Venturi effect
  • De-icing systems
  • Cooling oil
  • All are wrong

Question 29

Question
Q5. Fuel system can be used for:
Answer
  • Control of thrust
  • Hydraulic controls of engine system
  • Oil cooling
  • All are right

Question 30

Question
Q6. What is the meaning of JP:
Answer
  • James Patterson, the inventor of the fuel
  • Jet Purpose
  • Jet Propeller
  • None of above

Question 31

Question
Q7. What characteristics makes fuel so important for airlines.
Answer
  • It is flamable and dangerous
  • It isn ́t ecological
  • Fuel isn ́t so important for aeronautic operators
  • It represents almost a 40%, of the total cost, of a flight

Question 32

Question
Q8. JP-8 is equivalent to:
Answer
  • JET A-1
  • B
  • AVCAT ( Aviation Carrier Turbine fuel)
  • GPA (General Purpose Aviation fuel)
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