單項(xiàng)選擇題A burner responsible for producing black smoke in an automatic auxiliary boiler, would be caused by a （）

A.defective solenoid valve
B.dirty fuel nozzle
C.grounded high tension lead
D.faulty ignition cable connector


您可能感興趣的試卷

你可能感興趣的試題

1.單項(xiàng)選擇題A firebox explosion in an automatically fired auxiliary boiler may be the result of （）

A.excessive purging before lighting off
B.insufficient trail for ignition period
C.a faulty transformer in the ignition circuit
D.insufficient purging before lighting off

2.單項(xiàng)選擇題The diesel engine exhaust gas bypass, as fitted with some waste heat boilers, is installed to （）

A.prevent engine back pressure at heavy loads
B.increase total engine efficiency at low loads
C.prevent boiler corrosion at low engine loads
D.improve engine fuel consumption at any load

3.單項(xiàng)選擇題The fuel oil supply system to an automatic auxiliary boiler, will automatically shutdown if the boiler （）

A.steam demand is high
B.salinity is high
C.safety valve simmers
D.burner flame is extinguished

4.單項(xiàng)選擇題Flame failure in an automatically fired auxiliary boiler can from a/an （）

A.incorrect electrode setting
B.incorrect nozzle position
C.clogged fuel nozzle
D.broken high tension lead

5.單項(xiàng)選擇題In the event of a flame failure in an auxiliary water-tube boiler, you must（）

A.relight the boiler immediately to prevent loss of steam pressure
B.relight the fire off the brickwork as the bricks are cherry red
C.purge the furnace of any combustible gases before attempting to relight the fire
D.speed up the feed pump to prevent dry firing when the burner flame is reestablished