单项选择题Fuel oil is regularly transferred to the day tank in order to ()

A.allow impurities to settle out of the fuel
B.allow air to escape from the fuel
C.make fuel available for immediate use
D.all of the above


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1.单项选择题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

2.单项选择题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

3.单项选择题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

4.单项选择题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

6.单项选择题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

7.单项选择题A loud clicking noise from the valve compartment of an operating diesel engine would indicate()

A.worn valve seats
B.worn main bearing
C.excessive valve clearance
D.weak rocker arm springs

8.单项选择题In the cylinder of a diesel engine fuel is ignited by the()

A.spark from a plug in the pre-combustion chamber
B.electrical discharge from the distributor
C.heat of compression within the cylinder
D.heat from the fuel injection nozzle

9.单项选择题Diesel engine air start valve timing is controlled by()

A.engine operating speed
B.an air manifold
C.a hydraulic distributor
D.individual cams and valve gear

10.单项选择题The timing of diesel engine air starting valves is controlled by()

A.the air start valve timing gears and rods
B.a cylinder check valve
C.individual cams and valve gear
D.an air manifold poppet valve