1
Q
- What are the tasks of an aircraft engine?
A
It supplies hydraulic power electric power and bleed air for the pneumatic system. It also gives thrust.
2
Q
- What are the disadvantages of piston engines over gas turbine engines?
A
High to power ratio and performance loss in high altitudes.
3
Q
- How is propulsion force created?
A
By accelerating air pressure.
4
Q
- Jet propulsion is also called?
A
Reaction engine
5
Q
- What are the two ways of increasing the pressure?
A
- High pressure by compressor and volume of air when a fuel/air mixture is burned.
6
Q
- How is thrust generated by turbofan engine?
A
- Large mass of air with low velocity.
7
Q
- How much thrust is generated by the secondary airflow?
A
80 percent
8
Q
- What is the formula for thrust?
A
- Mass of air X velocity of air
9
Q
- Which airflow produces the majority of the thrust?
A
- Secondary
10
Q
- What is bypass ratio?
A
- Secondary over the primary airflow.
11
Q
- Exhaust Gas collide with ambient air?
A
- Produce more noise.
12
Q
- Thrust?
A
- Mass of air and velocity of air.
13
Q
- Turbo jet?
A
- More velocity - less air. Low bypass engine.
14
Q
- Thrust generated by turbofan?
A
- Secondary and primary.
15
Q
- Divergent?
A
Decrease in velocity- increase in static pressure.
16
Q
- Gearbox in turbo prop?
A
Manage the torque being given by the turbine.
17
Q
- Modular?
A
modern aircraft engine. Is split into a set of separate major modules.
18
Q
- Cobalt base alloys are used for?
A
Stator of the 1st stage of HPT.
19
Q
- Titanium base alloys are used for?
A
Mainly used in fan . the Ipc and front stages the hpc.
20
Q
- Nickel based alloys are used for?
A
- Hpc. hpt. Ipt.
