Final answer:
The types of injuries that can occur when machinery unexpectedly energizes or starts up include electrical shocks and crush or amputation injuries.
Step-by-step explanation:
When machinery unexpectedly energizes, starts up, or releases stored energy while employees are servicing the equipment, various types of injuries can occur. Some of these include electrical shocks, and crush or amputation injuries. Electrical shock can vary from minor to lethal shocks, with potential for cardiac arrest. Crush or amputation injuries are significant physical traumas that can result from machinery parts moving unexpectedly, often resulting in severe damage including loss of limbs. Other injuries such as sprains, strains, and chemical burns, while possible outcomes from workplace accidents, are not typically directly associated with the scenarios described in this question.