The main purpose of the turbine in the turbojet engine is to
a. drive the compressor.
b. reduce the temperature of the exhaust gas.
c. increase the velocity of the exhaust gases.
d. compress the air. ~it is not d.

The correct answer is A. drive the compressor. It's not D because the compressor compresses it, not the turbine. The temperature and the velocity of gasses are unrelated to this. There are in fact two turbines, and the first one gets power from exhaustion, which is then used to power to turbine in the turbojet that is used to drive the compressor. This is how turbojets commonly work.

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