Normal cranking speed of the engine is about ___________.

The normal cranking speed of an engine is approximately 200 RPM. This relatively low speed is sufficient for the engine to start and for all internal components to begin functioning correctly. The cranking process involves the starter motor, which is designed to turn the engine at a rate that allows the ignition system to fire and the fuel system to inject fuel properly, enabling the combustion process to start.

While other options represent speeds that are considerably higher, they do not reflect the actual requirement for the engine to successfully start. Cranking at too high of a speed could result in excessive wear on the engine components and the starter motor. The 200 RPM level provides a balance between adequate speed for engine combustion and maintaining mechanical integrity during the initial start-up phase.