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WorksheetsChamber combustion MIA
Total questions: 10
Worksheet time: 3mins
Which of the following is NOT a type of combustion chamber used in gas turbine engines?
Can
Can-annular
Annular
Difusser Tube
What is the main advantage of an annular combustion chamber compared to can and can-annular types?
Requires more cooling air
Provides smaller size and better pressure distribution
Causes flame propagation problems
Has lower combustion efficiency
During the primary combustion zone, the air-fuel ratio is approximately:
5:1
15:1
45:1
60:1
What is the typical pressure loss across a combustion chamber?
0-1%
2-4%
3-8%
10-15%
Why are two igniter plugs generally used in combustion chambers?
To improve fuel atomization
For redundancy and safety during start-up
To reduce NOx emissions
To increase pressure ratio
In a turbine stage, the stator vanes (Nozzle Guide Vanes) convert:
Kinetic energy into pressure energy
Pressure energy into kinetic energy
Mechanical energy into thermal energy
Heat energy into chemical energy
Which type of turbine combines both impulse and reaction principles?
Impulse turbine
Reaction turbine
Impulse-reaction turbine
Free turbine
What is the function of shrouds at turbine blade tips?
Increase blade weight
Reduce vibration and gas leakage
Increase rotational speed
Convert heat into pressure
What phenomenon occurs when turbine blades are subjected to high temperature and tensile stress for long periods, causing permanent deformation?
Surge
Flameout
Creep
Stall
What is the main role of Active Clearance Control in turbines?
To increase combustion efficiency
To control tip clearance between blades and casing
To cool turbine stator vanes
To regulate fuel pressure
