If you passed a state boiler exam for 1st class, grade C engineer, what equipment would your license allow you to operate?

The classification of a 1st class, grade C engineer's license typically grants the holder the authority to operate specific types of boilers based on their capacity and pressure limits. The selection of option B highlights that this level of licensing allows for the operation of boilers up to 500 horsepower and also pertains to hot water boilers that should not exceed 250 degrees Fahrenheit or steam boilers capped at 160 psi for steam and 15 psi for hot water.

This is consistent with the regulatory framework governing boiler operations, which aims to ensure safety and competency in handling high-pressure and high-temperature systems. Operating equipment beyond these limits would require a higher classification to ensure that engineers are adequately skilled and knowledgeable to manage the complexities and risks associated with such equipment. In contrast, the other choices either misstate the operational limits or specify conditions that exceed the recognized competencies for a 1st class, grade C engineer, which is essential for maintaining safety standards in boiler operation.