A low gas pressure cutoff switch ____ the burner from operating when the gas pressure in the supply line drops below the pressure necessary to maintain a stable flame at the burner.

Reserve storage coal, stocked for extended periods in the open air it will ____ by weathering and also there is an ever-present danger of spontaneous combustion.

A spreader stoker distributes the coal onto the surface of a traveling grate with ash discharged at the _____ of the furnace

Screens are fitted in the coal route to the bunkers to remove timber, stone, and oversize coal so that the supply to the ____ mills is kept free

The high gas pressure switch contacts are normally _____ whenever the main gas line pressure is below a preset pressure.

An overfeed stoker uses the ______ flow of fuel and air, with fuel flowing downward and air flowing upward.

The heating of heavy fuel oil takes place in ____ stages

In a _____ stoker, air for combustion is supplied by a forced draft fan an passes up through openings in the grate to the fuel.

The multi-spud burner has ____ spuds or jets connected to a circular manifold.

The temperature of the stock should be monitored, because temperatures of ___ deg C and above indicate the threat of fire.