15. Gas turbine engine - Q&A
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If a burner was down, in a multi-can system, the engine would tend to
- hang up.
- run up.
- surge.
explain??
Turboprop engine inlet anti-ice system operates
- continuously.
- cyclically dependant on weather conditions.
- cyclically independent on weather conditions.
turbine engine theoretically has 2 sections the main one operates continuously and the second one operates cyclically to avoid overload of the electric system
The exhaust gas temperature (E.G.T ) indicator on a gas turbine engine provides a relative indication of the
- turbine inlet temperature.
- temperature of the exhaust gases as they pass the exhaust cone.
- exhaust temperature.
The exhaust gas temperature (EGT) is typically defined as the gas temperature at the exit of the turbine
https://www.researchgate.net/publication/266673900_A_Review_of_Exhaust_Gas_Temperature_Sensing_Techniques_for_Modern_Turbine_Engine_Controls#:~:text=The%20exhaust%20gas%20temperature%20%28EGT%29%20is%20typically%20defined,parameter%20for%20optimizing%20fuel%20economy%2C%20diagnosis%2C%20and%20prognosis.
Nozzle guide vanes give a
- pressure increase, velocity decrease.
- pressure increase, velocity increase.
- pressure decrease, velocity increase.
nozzle guide vane are associated with compression section, so they're used to maximise compression performance (they're divergent) by decrease the speed & increasing pressure gain for each stage
Nozzle guide vanes give a
- pressure increase, velocity decrease.
- pressure increase, velocity increase.
- pressure decrease, velocity increase.
nozzle guide vane are associated with compression section, so they're used to maximise compression performance (they're divergent) by decrease the speed & increasing pressure gain for each stage
Upon what quality or characteristic of a lubricating oil is its viscosity index based?
- Its rate of flow through an orifice at a standard temperature.
- Its rate of change in viscosity with temperature change.
- Its resistance to flow at a standard temperature as compared to high grade paraffin base oil at the same temperature.
viscosity is defined as mm^2/s for a determined temperature.
The working fluid of a gas turbine engine is
- gasoline.
- kerosene.
- air.
Can anyone help me with this question?
Fire detection systems which are routed through another zone
- must be protected by the use of heat sinks.
- must be protected from heat sources in the zone.
- are not allowed.
Aren't the first and second sentence saying the same thing? Can some one find a reference pls?
Where do stress rupture cracks usually appear on turbine blades?
- Across the blade root, parallel to the fir tree.
- Across the leading or trailing edge at a right angle to the edge.
- Along the leading edge, parallel to the edge.
The first 2 answers aren't saying the same thing?
The purpose of the rotating guide vanes on a centrifugal compressor is to
- direct the air smoothly into the impeller.
- provide initial diffusing of the air.
- prevent damage by solid objects.
can someone please explain to me?
Acoustic linings made from composite materials are used in what section of the engine?
- Not used to suppress noise.
- Hot section and Cold Section.
- Cold section only.
i dont understand
For fire detection and extinguishing purposes, aircraft powerplant areas are divided into fire zones based on
- the volume and smoothness of the airflow through engine compartments.
- engine type and size.
- hot and cold sections of the engine.
i think this asnwer is also wrong my pdf says "The zoning layout will depend on the characteristics of the
individual engin"
Following the reports of a heavy landing you would
- carry out a complete visual examination of the power plant.
- examine the engine mountings and borescope the nozzle guide vanes and turbine.
- examine the engine mountings and fuse pins.
why not the mountings?
Screech liners in the afterburning jet pipe
- prevent unstable combustion.
- prevent cyclic vibrations of large amplitude.
- acts as noise suppressors.
i think the answer is wrong my textbook says that they act as noise suppressors.I quote "These are commonly called as Noise suppression liners or Noise
attenuation mattresses. When installed in the exhaust area these
are also known as Screech liners"
What type of intake is one that decreases gradually in area and then increases?
- Convergent.
- Convergent / Divergent.
- Divergent.
isnt this divergent only?Why can it be also convergent?I think convergent is the opposite of what it says.
Water methanol for cooling is injected into the
- compressor inlet or outlet.
- engine hot zone.
- combustion chamber.
why isnt methanol injected into combustion to help with the freezing of water?
The velocity of supersonic air as it flows through a divergent nozzle
- decreases.
- increases.
- is inversely proportional to the temperature.
why is it increasing?It isnt convergent,it is divergent.Can someone help?
An increase in the Ram Ratio of an intake will
- have no effect upon the temperature of the compressed air.
- increase the temperature of the compressed air.
- decrease the temperature of the compressed air.
I think the answer "C" or "3" is correct.
Air bleed valves are
- closed at low RPM.
- open at high RPM.
- open at low RPM.
Please write your question here.
An H.M.U receives its signals from
- E.C.
- ADC.
- thrust lever resolvers.
Hi,
EC reffers ECU??
Thanks
An exhaust cone placed aft of the turbine in a jet engine will cause the pressure in the first part of the exhaust duct to
- increase and the velocity to decrease.
- decrease and the velocity to increase.
- increase and the velocity to increase.
The type of duct that forms the exhaust cone will determine what happens with the pressure and temperature. I distinguish 2 types of cone and therefore 2 types of conduit:
1 / convergent - divergent
2 / divergent
Kerosene will burn effectively at an air/fuel ratio of
- 150:1.
- 15:1.
- 45:1.
but the mixture provided to the combustion chamber is of ratio 45:1
An exhaust cone placed aft of the turbine in a jet engine will cause the pressure in the first part of the exhaust duct to
- increase and the velocity to decrease.
- decrease and the velocity to increase.
- increase and the velocity to increase.
Please write your question here.
What are the principal advantages of the duplex fuel nozzle used in many turbine engines?
- Allows a wider range of fuels and filters to be used.
- Restricts the amount of fuel flow to a level where more efficient and complete burning of the fuel is achieved.
- Provides better atomization and uniform flow pattern.
Please write your question here.
An abradable lining in the fan case
- prevents fan blade tip rub.
- produces less leakage at tips for anti-ice.
- provides acoustic medium.
how can it reduce noise?