單項選擇題

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

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單項選擇題

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

單項選擇題

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