Questions on "Engines [Gas Turbines]"

[truefaith]

Can somebody help?


Q5. A pitot intake forms a __ duct ___ the fan to ensure that the airlfow ___ to ___ and achieves a ___.
(a) convergent, before, speeds up, subsonic, pressure rise
(b) divergent, after, slows down, subsonic, pressure rise
(c) divergent, before, speeds up, sonic, pressure drop
(d) divergent, before, slows down, subsonic, pressure rise

Q6. One advantage of an annular combustion chamber system is that:
(a) the diameter of the engine is reduced
(b) there is unrestricted airflow at maximum r.p.m.
(c) there are no flame propagation problems
(d) the air casing area is greater

Q7. Water injection is used for take-off:
(a) to cool the combustion chambers
(b) to cool the turbine blades
(c) only at high altitude airfields where the prevailing temperature is high
(d) at airfields with an ambient temperature above 30F.

Q8. In a high ratio by-pass engine
(a) all of the air go thru both the low and high pressure compressors
(b) not all the air go thru the high poressure compressor
(c) not all the air go thru low pressure compressor
(d) all the air thru the high pressure compressor

Q9. Aft of the compressor
(a) the velocity of the airflow remains the same
(b) the velocity of the airlfow decreases before the combustion chamber
(c) the velocity increases before the combustion chamber
(d) the air pressure decreases before the combustion chamber