Question

Which of the following remain useful for engine selection and in choosing desirable operating points for an engine?

• A. Engine performance map
• B. Engine efficiency map
• C. Engine testing map
• D. Engine speed map

Hint:

For selecting engines, performance maps are crucial for understanding how the engine will perform under different conditions.

Answer 1

The Correct Option is A

Step 1: Understanding engine maps.
Engine performance maps are useful for selecting an engine and determining desirable operating points. These maps provide information on the engine’s performance under various conditions, which helps in making decisions regarding engine selection and optimization.
Step 2: Analysis of options.
- (1) Engine performance map: Correct. It provides vital information for engine selection and optimization. - (2) Engine efficiency map: Incorrect. Efficiency maps are not primarily used for engine selection, but for operational efficiency evaluation. - (3) Engine testing map: Incorrect. Testing maps are used for specific performance tests rather than general selection. - (4) Engine speed map: Incorrect. While speed maps provide operational information, they are not directly related to engine selection.
Step 3: Conclusion.
The correct answer is (1) Engine performance map.
Final Answer: \[ \boxed{1. Engine performance map.} \]