Pregunta 1
Pregunta
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.
Respuesta
-
promotes
-
prevents
-
opens
-
raises
Pregunta 2
Pregunta
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.
Respuesta
-
mature
-
vaporize
-
deteriorate
-
solidify
Pregunta 3
Pregunta
A spreader stoker distributes the coal onto the surface of a traveling grate with ash discharged at the _____ of the furnace
Pregunta 4
Pregunta
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
Respuesta
-
supply
-
pulverizing
-
storage
-
grading
Pregunta 5
Pregunta
The high gas pressure switch contacts are normally _____ whenever the main gas line pressure is below a preset pressure.
Respuesta
-
Open
-
stable
-
frozen
-
closed
Pregunta 6
Pregunta
An overfeed stoker uses the ______ flow of fuel and air, with fuel flowing downward and air flowing upward.
Respuesta
-
cocurrent
-
crosscurrent
-
countercurrent
-
undercurrent
Pregunta 7
Pregunta
The heating of heavy fuel oil takes place in ____ stages
Pregunta 8
Pregunta
In a _____ stoker, air for combustion is supplied by a forced draft fan an passes up through openings in the grate to the fuel.
Respuesta
-
overfeed
-
crossfeed
-
traveling
-
spreader
Pregunta 9
Pregunta
The multi-spud burner has ____ spuds or jets connected to a circular manifold.
Pregunta 10
Pregunta
The temperature of the stock should be monitored, because temperatures of ___ deg C and above indicate the threat of fire.