Discussion
What is the advantage of an injector used for boiler?
Answer: C
The advantage of an injector for a boiler is that it has no moving parts, hence there are no dynamic parts. An injector uses a steam jet to raise the pressure of the feed water, so nothing in it rotates or reciprocates, which makes it simple. Its pumping efficiency is low, it cannot force very hot water into the boiler, and it does not work smoothly in extreme variation of load and pressure, so the other options are wrong.
The steam used by the injector condenses in the feed water, so its heat returns to the boiler, which is why the injector is a compact and cheap feed device on locomotives and small boilers.
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