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


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1.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

2.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

3.單項(xiàng)選擇題The purpose of a temperature sensing device installed in the stack of a small automatically fired auxiliary steam boiler is to secure the oil burner（）

A.in the event of a flame failure
B.in the event of a stack fire
C.when the water level reach the crown sheet
D.when the feed pump discharge pressure drops to a preset minimum

4.單項(xiàng)選擇題Burner ignition failure in an automatically fired auxiliary boiler would be caused by（）

A.a burned out solenoid in the oil supply valve
B.high temperature excess air
C.incorrectly setting the hot-well dump valve
D.an incorrectly positioned burner snubber realy

5.單項(xiàng)選擇題Which of the following actions should normally be taken during each watch when the auxiliary boilers is in operation?（）

A.clean the flame scanner photocell window
B.Inspect and clean all solenoid valves
C.lift the safety valves by hand
D.Inspect for oil or water leaks