A 60º decrease in incoming air temperature results in a 6% horsepower increase. For a 300 hp engine, how many horsepower more is that?

• A. 12 hp
• B. 18 hp
• C. 24 hp
• D. 30 hp

Answer: (B)

This question tests how to convert a percentage change into an actual horsepower increase for a given base power. If horsepower rises by 6% on a 300 hp engine, you multiply 300 by 0.06: 0.06 × 300 = 18. So the engine gains 18 horsepower. The new output would be 300 + 18 = 318 hp, but the amount asked for is the increase, which is 18 hp. (For quick check, 12 would be 4% of 300, 24 would be 8%, etc., so only 18 matches the 6% increase.)