Discussion
Which of the following would not be expected during a normal gas turbine start?
Answer: D
Correct answer: Exhaust temperature rising before any fuel flow
Temperature can only rise once fuel is burning, so a rise before fuel flow is indicated has no source. In a normal start the sequence is rotation first, then fuel and ignition, then light-up and a temperature rise.
The other three are all expected. The starter turns the engine and rotor speed rises; exhaust temperature peaks shortly after light-up and then settles as airflow increases with speed; and oil pressure rises with rotor speed as the engine-driven pump comes up. A temperature rise without fuel flow would point to an instrumentation fault or a residual condition rather than a start.
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