Which of the following actions is recommended when a machine is jammed?

When a machine experiences a jam, disconnecting the power and checking the machine is the safest and most effective response. This action ensures that the operator is not exposed to any potential injury from moving parts or unexpected starts of the machine while attempting to resolve the issue. By disconnecting the power, it allows for a secure inspection of the jammed area without the risk of accidental activation.

This procedure is critical not only for personal safety but also for protecting the machinery from further damage, which could occur if one were to forcefully attempt to clear the jam while it is still powered on. Additionally, addressing the situation directly by assessing the cause of the jam can help in implementing a proper solution rather than resorting to unsafe or ineffective measures.