16 Gas Turbines Combustion Chambers – LMS

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📄 Notes ⚡ Cheat Sheet

Q1. One of the advantages of an annular combustion chamber is:

a reduced thermal stress on the turbine.

that fewer igniters are required.

a higher structural strength.

a simpler assembly.

Q2. One of the advantages of annular combustion chamber over a multiple can is that:

the thermal load distribution on the HP turbine is more favourable.

assembly and disassembly is easier.

engine length is shorter because no diffuser is required.

only one igniter is required.

Q3. The function of the drain valve in a gas turbine combustion chamber is to:

check whether the fuel nozzles leak fuel after engine shutdown.

prevent a wet start

vent the combustion chamber after engine shutdown

remove unburned fuel from the combustion chamber

Q4. What is the correct sequence during the in-flight windmilling start of a turbine engine?

Starter, rotation, fuel, ignition

Ignition, rotation, fuel

Starter, rotation, ignition, fuel

Rotation, ignition, fuel

Q5. In which part of a gas turbine engine are high temperature requirements most critical for the materials used?

The last part of the HP compressor and front part of the HP turbine.

The turbine and exhaust nozzle.

The combustion chamber and exhaust nozzle.

The combustion chamber and front part of the HP turbine.

Q6. When a gas turbine engine is fitted with can-type combustion chambers:

each chamber has its own igniter.

each chamber is fitted with one igniter and one glow plug.

a total of only two igniters are usually fitted since the chambers are inter-connected.

each chamber is fitted with two igniters.

Q7. In a gas turbine combustion chamber:

secondary air is required for cooling of the inner casing.

the gas pressure increases in an axial (downstream) direction.

the gas temperature is highest at the chamber outlet.

the axial velocity of the gas stream is greatest behind the swirl vanes.

Q8. In a theoretical gas turbine cycle, combustion takes place at constant:

pressure.

volume.

temperature.

energy.

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