單項(xiàng)選擇題Soot blowers should be used in proper sequence so that（）

A.excess stresses will not be set up in the boiler
B.the decks will not be covered with soot
C.the soot will be swept toward the uptakes
D.there will not be a loss of steam pressure


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1.單項(xiàng)選擇題The valve that prevents water from backing out of the boiler into the feed line is the（）.

A.bottom-blow valve
B.skin valve
C.feed-check valve
D.feed-stop valve

2.單項(xiàng)選擇題The mechanical exhaust valve operation system is replaced by（）in an electronic controlled ME engine.

A.a system with a Hydraulic Power Supply (HPS) unit
B.a system with roller guides for exhaust valves
C.a system with an electronically controlled Alpha Lubricator
D.a system directly powered by electric motor

3.單項(xiàng)選擇題（）is not a feature of the electronic controlled engines.

A.Lower fuel consumption
B.Better balanced cylinder power
C.A shorter overhaul period
D.Less smoke emission

4.單項(xiàng)選擇題If a camshaft-less engine has a normal injection pressure at rated speed, the injection pressure will be at slow speed（）

A.too low
B.a little lower
C.a little higher
D.exactly the same

5.單項(xiàng)選擇題If a cam-controlled engine has a normal injection pressure at rated speed,the injection pressure will be（）at slow speed.

A.a little lower
B.a little higher
C.too low
D.exactly the same