The constrained-gap igniter plug used in some gas turbine engines operates at a cooler temperature because:
A lot of igniter plugs are known to be a kind of an annular-gap plug type.
Note that Constrained gaps are known to be a kind of a plug that is often used in some specific kinds of engines.
It function to give an effective spark of the annular-gap plug projects in a little way into the combustion chamber liner. The spark of the constrained-gap plug is one that do not rightly follow the face of the plug.
Therefore, The constrained-gap igniter plug used in some gas turbine engines operates at a cooler temperature because:
Hence, option B is correct.
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The constrained-gap igniter plug used in some gas turbine engines operates at a cooler temperature because