A burner should always be firing for periods shorter than periods when it is off to maintain a consistent furnace temperature and improve efficiency.

A hot water boiler relief valve is rated in ___ relieved per hour.

Water used to fill the boiler during a hydrostatic test should be a minimum of ___°F.

There are many designs of heat exchangers, but the common element is a relatively thin barrier separating the cooling or heating fluid from the process fluid.

According to the ASME Code, a try lever test on a safety valve should be performed every ___ the boiler is in operation and after any period of inactivity.

Protective ___ protect workers by resisting penetration and absorbing the blow of impact.

A ___ system provides the air necessary for combustion.

A boiler is a confined space and requires special entry procedures.

The two common types of cooling systems are direct-expansion systems and indirect expansion systems.

There are four main causes of natural circulation in a boiler.