Which of the following notations does the...

🔍 Key Concepts

• Indicated horsepower (IHP) formula for reciprocating engines: IHP = PLAN/33,000 • Meaning of each term: P (mean effective pressure), L (stroke length), A (piston area), N and how it relates to time and engine cycle • Difference between power strokes and revolutions in 2‑stroke vs 4‑stroke engines

💭 Think About

• Think about whether the formula needs a value "per minute" or "per revolution" to end up with horsepower, which is power over time • Consider how many power strokes occur for each revolution in a 2‑stroke engine versus a 4‑stroke engine • Ask whether N should change for 2‑stroke vs 4‑stroke engines, or stay as a common measure for both

✅ Before You Answer

• Check that the units of PLAN divided by 33,000 work out to horsepower (hp), which is ft‑lb per minute • Verify whether N must represent something that is directly in "per minute" to match horsepower units • Confirm how the number of power strokes relates to engine speed (RPM) for 2‑stroke and 4‑stroke engines before choosing among the options

Which of the following notations does the "N" represent in the formula shown below? IHP= PLAN/(33000)

Number of power strokes per revolution.

Number of revolutions per minute for both two-stroke and four-stroke engines.

Number of power strokes per minute.

Number of power strokes per second.

🔍 Key Concepts

💭 Think About

✅ Before You Answer