Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

CAA Module 15 > Module 15.3 Inlets > Flashcards

Module 15.3 Inlets Flashcards

1
Q

What is used to straighten the airflow and direct it into the first compressor stages?

A

Inlet Guide Vanes (IGV’s)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is required to avoid compressor stall?

A

Uniform and steady airflow

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

The air inlet duct is considered part of what?

A

Airframe

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What can be said about a divergent duct?

A

Velocity - Decrease
Pressure - Increase
Temperature - Increase

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Turboprop and turboshaft engines have what to prevent FOD ingress?

A

Screens

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Where can the inlets be in a divided entrance duct aircraft?

A

Wing root or scoop at each side of the fuselage

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is placed in the side scoop inlet to assist in straightening the airflow?

A

Turning vanes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is a disadvantage of divided entrance ducts W.R.T. Sudden flight movements?

A

Imbalances in Ram air pressure causing a slight power loss

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is the purpose of diffusers?

A

Decrease velocity and increase static pressure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What type of lip do you want at the inlet of a supersonic aircraft?

A

Sharp lip

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What aircraft would round lip inlets be used on?

A

Subsonic

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What occurs to the inlet area of a variable geometry duct with varying speeds?

A

Inside area changed by a mechanical device

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What are the 3 methods of slowing airflow to subsonic levels?

A
  • Vary the area
  • Variable airflow bypass
  • Shockwave in the airstream
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What are the disadvantages of compressor inlet screens?

A

Loss in inlet duct pressure and are susceptible to icing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

When are inlet screens retracted?

A

After take off or if icing conditions are detected

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

When would a bell mouth compressor inlet be used?

A

During engine testing in a test cell

17
Q

What are the benefits to the bell mouth compressor inlets during testing?

A
  • Very high aerodynamic efficiency
  • Duct loss is considered 0
18
Q

What is considered the best inlet design for turboprop engines?

A

Ducted arrangement

19
Q

What is used to deflect ice and dust/dirt away from the intake?

A

Deflector doors

20
Q

What is the drawback to two spool engines?

A

Fan and low pressure compressor are connected. Fan has a limited rotational speed which is slower than the optimum compressor rpm. This means that the low pressure compressor is not at its optimum efficiency

21
Q

How does the fan prevent FOD ingestion?

A

Hits the fan and thrown radially outward

22
Q

How is the inlet lip and fan hub/spinner anti-iced?

A

Lip - Warm bleed
Fan hub/spinner - Warm bleed or conical spinner

23
Q

What effects can ice build up cause?

A
  • Engine sucks in ice
  • Disturbed airflow
24
Q

What do turboprops use to anti-ice inlet areas?

A

Warm oil

25
Q

If only the cowls require anti-ice what may be used?

A

Electric heat strips

26
Q

When can ice form in inlet areas?

A
  • 5℃ in dry condition
  • 7℃ in fog/rain conditions
27
Q

What are the types of anti-ice?

A
  • Bleed air
  • Electric heating
28
Q

What engines is bleed air generally used in?

A

High-mass airflow

29
Q

Air bled from the HP compressor is used to anti-ice what?

A
  • IGV’s
  • Spinner
  • Lip
30
Q

What is the purpose of the anti-icing valve?

A
  • Prevent over pressurisation
  • Limit amount bleed air
31
Q

The engine anti-ice system uses hot air from what?

A
  • Pneumatic system
  • Directly from the engine
32
Q

When is the manual function of the anti-ice regulator valve used?

A

Valve or system failure

33
Q

When the engine is controlled by Electronic Engine Control (EEC), what is it linked with?

A

Anti-ice

34
Q

What is the most common type of engine ice protection system?

A

Thermal system

35
Q

As aircraft speed increases what happens to the thrust?

A

Thrust tends to decrease

36
Q

As the aircraft reaches a certain speed, what compensates for the losses in thrust caused by this increase in speed?

A

Ram recovery

37
Q

What is another name for ram recovery?

A

Total pressure recovery

CAA Module 15 (18 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions