When a horizontal rotary oil burner is under semiautomatic control, what can generally be assumed?

• A. Ignition is automatic
• B. Starting requires pressing a button
• C. Ignition and starting are done manually
• D. Maintenance is automatic

Answer: (C)

When a horizontal rotary oil burner operates under semiautomatic control, it typically implies that certain functions are automated while others still require manual intervention. The assumption is that ignition and starting processes are performed manually; this means an operator needs to engage in these critical tasks to ensure safety and proper functionality.

In this context, the automatic aspects of the burner system generally relate to adjustments during operation or safety controls that may not need active input once engaged. However, since the system is not fully automated, the initial steps of getting the burner operational—such as pressing a button or other forms of ignition—remain the responsibility of the operator.

Other answer choices suggest different degrees of automation that aren’t accurate for semiautomatic systems. For instance, if ignition were completely automatic, it would not necessitate any manual effort, contradicting the semiautomatic nature. Similarly, if maintenance were automatic, it would imply a level of operation inconsistent with semiautomatic systems, which still require human oversight and action for maintenance and troubleshooting tasks.