Question

If the alternator-to-engine drive ratio is 2.15 to 1, what rpm will the alternator have when the engine is idling at 200 rpm? Hint: Use a direct proportion. The alternator will have ___ rpm when the engine is idling at 200 rpm

Answer 1

Answer:

430 rpm

Explanation:

We were given the following information:

The alternator to engine drive ratio is 2.15 to 1

The engine is idling at 200 rpm

We are to obtain the rpm for the alternator using direct proportion. This is shown below:

$\begin{gathered} 2.15:1 \\ x:200 \\ \Rightarrow\frac{2.15}{1}=\frac{x}{200} \\ \text{We cross multiply, we have:} \\ x*1=200*2.15 \\ x=430 \end{gathered}$

Therefore, the rpm of the alternator is 430 rpm