Ignition system of gas turbine engines.
Thread Starter
Joined: Oct 2013
Posts: 20
Likes: 1
From: Seoul
Ignition system of gas turbine engines.
What is the answer of the following question?
I think a) is right answer but the book says the answer is b).
Is that right?
The book is Oxford JAA ATPL - Powerplant
A gas turbine engine which has both high and low energy ignition systems uses the high energy system for (i), and the low energy system for (ii):
(i) / (ii)
a) Engine starting / High altitude relighting
b) High altitude relighting / Take off from contaminated runways
c) Take off from snowy runways / Engine start
d) Take off from flooded runways / Take off from snowy runways.
I think a) is right answer but the book says the answer is b).
Is that right?
The book is Oxford JAA ATPL - Powerplant
A gas turbine engine which has both high and low energy ignition systems uses the high energy system for (i), and the low energy system for (ii):
(i) / (ii)
a) Engine starting / High altitude relighting
b) High altitude relighting / Take off from contaminated runways
c) Take off from snowy runways / Engine start
d) Take off from flooded runways / Take off from snowy runways.
Joined: Feb 2002
Posts: 324
Likes: 0
From: Sunny Solihull
According to Rolls Royce book The Jet Engine:-
High-energy ignition is used for starting all jet engines.
It then goes on to state that a high value output (12 joules) is required for relight at high altitudes. However, on contaminated runways as it may be necessary to have continuous ignition for automatic relight then a low value (3-6 joules) is better as it gives longer life to the ignition plugs/unit.
So I should say that B is the correct answer.
High-energy ignition is used for starting all jet engines.
It then goes on to state that a high value output (12 joules) is required for relight at high altitudes. However, on contaminated runways as it may be necessary to have continuous ignition for automatic relight then a low value (3-6 joules) is better as it gives longer life to the ignition plugs/unit.
So I should say that B is the correct answer.
