Final answer:
The student's question about the frequency of attendance required for a <30 BHP high pressure boiler plant does not have a provided correct answer due to varying local regulations. Correct supervision intervals are crucial and are typically determined by local regulations.
Step-by-step explanation:
The student's question pertains to the operation and safety protocols of high pressure boiler plants with 30 or fewer boiler horsepower (bhp). Correct supervision intervals for these plants are essential for safe operation but may vary by jurisdiction. However, given that no exact time for attendance is mentioned in the provided options, we should look toward generally accepted practices in engineering or specific local regulations for guidance. For some places, high pressure boilers may be required to be checked at regular intervals sometimes varying from simply daily checks to constant supervision depending on the size and risk factor of the plant. To provide a specific answer, it would be necessary to refer to the regional or national regulations that apply to the plant's operation. This ensures that both safety and compliance are adhered to.