What type of spray is used during engine start?

The correct answer is a fine spray because during engine start, fuel needs to be atomized adequately for efficient combustion. A fine spray allows for better mixing of the fuel with air, which is crucial in achieving the right mixture ratio required for ignition and smooth engine operation. This atomization helps in producing a more homogeneous mixture that can ignite easily when the engine starts, thus ensuring a more reliable and efficient startup process.

In the context of engine operations, other spray types may not provide the same level of efficiency or may produce larger fuel droplets, which can lead to incomplete combustion or difficulty in starting the engine. Therefore, employing a fine spray during engine start is essential for optimal performance and reliability.