單項選擇題The arrangement and shape of the cams on a diesel engine camshaft directly control which of the listed groups of operating conditions?（）

A.speed, torque, and horsepower production
B.firing order, valve timing, and valve lift
C.fuel consumption, efficiency, and cylinder pressure
D.scavenge pressure, compression ratio, and exhaust pressure


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1.單項選擇題Corrosion inhibitors and/or soluble oils are added to diesel engine cooling systems to （）

A.maintain low pH in the cooling water
B.reduce the cooling water temperature
C.increase cooling water hardness
D.form a protective film on metal surfaces

2.單項選擇題Fuel droplets injected into a diesel engine cylinder must have adequate penetration to （）

A.prolong the ignition delay period
B.ensure the beginning of fuel injection
C.thoroughly utilize the air charge
D.allow controlled fuel combustion

3.單項選擇題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

4.單項選擇題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

5.單項選擇題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