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WorksheetsAircraft Power Plant - Turbine
Total questions: 11
Worksheet time: 10mins
In an axial flow turbine, the total temperature of the flow through nozzle always
decreases
increases
remain constant
None of the above
The space between two nozzle guide vanes form a
Divergent duct
Convergent duct
Convergent - Divergent duct
None of the above
For an axial flow turbine, absolute velocity at exit of the rotor is ______________ the same at the inlet.
higher than
lower than
remain constant
can't comment
The blade shroud is fitted in an attempt to
reduces the vibration of the blades
reduces gas leakage
minimize losses due to to leakage across the turbine blade tips
control the velocity of the gas stream
Definition of a free turbine or free power turbine
has its own optimum speed
a turbine which is not connected to the compressor
it's connected only either to the propeller or to the rotor reduction gearbox
All of the above
The power output of a turbine can be increased with an _____________ number of stages with a ________________ in turbine diameter.
decrease, smaller
increase, larger
increase, reduction
decrease, larger
It's a fact that the efficiency of the turbine blades ____________ as its rotational speed ______________.
(a)
Turbine blades are classified into __________ types, namely _______________ .
two: impulse and reaction
three: impulse, reaction and impulse-reaction
one: impulse-reaction
Within the convergent duct between the two nozzle guide vanes, some of the potential or pressure energy in the gas stream is converted to
thermal energy
kinetic energy
velocity energy
All of the above
On average the energy loss in the turbine is about _______ percent which comprised of approximately _______ percent aerodynamic losses in the _______________ and _______ percent in the ________________ .
(a)
The ________________________ is the most commonly used system of fixing the blade to the disc.
fur tree
fir tree
fixed tree
pine tree
