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Which of the following pumps are often employed in combustion ignition engines for the direct injection of fuel into the combustion chamber?

A. Centrifugal pump
B. Diaphragm pump
C. Gear pump
D. Common rail pump

Answer :

Final answer:

The common rail pump is commonly used in diesel engines for the direct injection of fuel, which provides the high pressure necessary for efficient combustion during the power stroke.

Explanation:

In combustion ignition engines, particularly diesel engines, the type of fuel pump typically employed for the direct injection of fuel into the combustion chamber is the common rail pump. During the combustion process, the diesel cycle involves the following stages: first, the intake of air; second, an adiabatic compression which raises the air temperature; third, the injection of fuel by the pump at a high pressure, causing immediate ignition; and fourth, a power stroke where the expanding gases push the piston down. The common rail pump is integral to this process, as it is capable of providing the necessary high pressures for fuel to be injected directly into the combustion chamber during the power stroke, ensuring efficient combustion and power delivery.

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