Question 4 of 30
Speed of diesel engine is adjusted by changing the supply of
A
air
B
fuel
C
water
D
lubricating oil
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Answer & Explanation
The correct answer is Option B: fuel.
The speed of a diesel engine is primarily regulated by controlling the amount of fuel injected into the cylinders. Increasing fuel supply increases power and speed, while decreasing it reduces them. Air supply is also important but fuel is the primary control.