單項(xiàng)選擇題Starting air valves are held firmly on their seats by（）

A.cam rollers on the camshaft
B.spring force
C.air pressure on top of the valve differential piston
D.air pressure on the bottom of the valve differential piston


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1.單項(xiàng)選擇題The depth of fuel oil in a tank is normally measured through the（）

A.vent line
B.overflow line
C.feed line
D.sounding tube

2.單項(xiàng)選擇題Which of the following methods is used to prevent throttling of compressed air through the diesel engine air starting valves?（）

A.Holding the valve open for a long period
B.Increasing the starting air pressure used
C.Opening the stating air valve quickly
D.Reducing the starting air valve size

3.單項(xiàng)選擇題Small crack in the crankshaft bearing surface of a diesel engine are an indication of（）

A.corrosion fretting
B.insufficient lubrication
C.abnormal wear
D.fatigue failure

4.單項(xiàng)選擇題Fuel oil day tanks for diesel engines must be checked and cleaned and cleaned at regular intervals in order to remove（）

A.sludge
B.water
C.micro-organism growth
D.all of the above

5.單項(xiàng)選擇題Excessively worn, or polished ends on a diesel engine valve spring, indicate（）

A.burned exhaust valves
B.excessive spring compression
C.spring surge
D.worn valve seats