單項(xiàng)選擇題The primary function of a fuel delivery check valve assembly is to（）

A.deliver proper fuel quantity to the injection nozzle
B.provide rapid fuel injection cutoff
C.control fuel quantity entering the pump body
D.control fuel pressure delivered to the combustion chamber


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1.單項(xiàng)選擇題For any piston ring to operate smoothly without scuffing ,the ring must be （）.

A.of a material harder than the cylinder liner
B.properly lubricated
C.prevented from compressing
D.prevented from rotating during engine operation

2.單項(xiàng)選擇題Shaker, circulation and spray are the three general methods used in（）

A.pre-injection fuel oil treatment
B.lube oil filtration
C.lube oil purification
D.piston cooling

3.單項(xiàng)選擇題Wristpin bearings are difficult to lubricate because of their oscillating motion and（）

A.their free-floating design
B.their relatively small size
C.the reciprocating motion of the piston
D.their position in the lubrication system

4.單項(xiàng)選擇題Internal combustion engine crankcase vent outlets must be equipped with （）

A.hinged rain guards
B.corrosion resistant flame screens
C.dipsticks for measuring oil levels
D.crankcase ventilation fans

5.單項(xiàng)選擇題The interior of some diesel engine saltwater heat exchangers are protected from corrosion by the use of（）

A.aluminum plates
B.lead cathodes
C.copper baffle plates
D.sacrificial zincs