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How many types of common rail injection systems are there?

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How many types of common rail injection systems are there?

(a) 1

(b) 2

(c) 3

(d) 4

I have been asked this question in an online quiz.

This intriguing question originated from Fuel System topic in chapter Diesel Engine Plant of Energy Engineering

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The correct choice is (b) 2

For explanation I would say: There are basically two types of common rail injection systems which are by using single pump and using controlled pressure system. In case of single pump, it supplies high pressure fuel to header. In the controlled pressure system, it has a pump which maintains a set head pressure.

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