WorksheetsCHƯƠNG 6 255-275
Total questions: 20
Worksheet time: 10mins
If the area of the nozzle was too large the effect is.
will 'choke' at mach 1.
exit velocity lower causing loss of the thrust.
exit velocity lower, negligible effect on thrust.
Lobe type exhaust noise suppressors are made from.
heat resistant alloy.
composite Material.
steel.
What indication does the pilot receive that thrust reversers have deployed?.
A sequence of lights.
A feeling of rapid deceleration.
What angle are the exhaust gasses turned through in a clamshell type thrust reverser?.
180 degrees.
135 degrees.
45 degrees.
The purpose of a propelling nozzle is to.
increase the velocity of the air and increase thrust.
decrease the velocity of the exhaust to increase static pressure.
direct the air onto the turbines.
If a thrust reverser is deployed at lower than normal landing speed.
exhaust gases can be ingested into the engine.
the thrust reverser will be ineffective.
if the EGT gets too high the thrust reverser will automatically restow.
The size of the exhaust section is dictated by.
cone or diffuser size and location.
size of engine only.
size and location of the engine.
On a Clamshell door type thrust reverser. The Clamshell doors redirect the exhaust gas stream.
0 degrees to the thrust line.
45 degrees to the thrust line.
90 degrees to the thrust line.
Normal gas turbine engine's exhaust duct is.
divergent.
convergent/divergent.
convergent.
As the air flows out at the outflow of a choked nozzle.
velocity increases and pressure decreases.
velocity and pressure decrease.
velocity decreases and pressure increases.
Main bearing oil seals used with turbine engines are usually what type(s)?.
Teflon and synthetic rubber.
Labyrinth and/or carbon rubbing.
Labyrinth and/or silicone rubber.
If, during inspection at engine overhaul, ball or roller bearings are found to
have magnetism but otherwise have no defects, they.
are in an acceptable service condition.
cannot be used again.
must be degaussed before use.
A carbon seal has which type of sealing arrangement?.
Full contact with race.
Full contact with casing.
Full contact with labyrinth.
The highest turbine bearing temperature takes place.
all the time.
at start-up.
at shut-down.
The function of a labyrinth seal is to create.
between fixed and rotating components.
an airtight seal between fixed and rotation components.
an airtight seal between fixed adjacent casing surfaces.
The bearings of a compressor rotor are usually.
ball and roller.
plain.
sintered.
Bearing seal failure would most probably cause.
high oil temperature.
high oil consumption.
low oil pressure.
Why are oil seals pressurised?.
To ensure minimum oil loss.
To ensure oil is forced into the bearings.
To ensure that the oil is prevented from leaving the bearing housing.
What bearing is used to take axial loads on a main rotation shaft of a gas turbine engine?
Plain bearing.
Roller bearing.
Ball bearing.
Seals on a gas turbine engine restrict leakage of oil by.
spring pressure.
closely tolerated contacting components.
air pressure.
