單項選擇題If the cooling water temperature and the lube oil temperature in a diesel engine are too high, the cause can be （）

A.a dirty lube oil strainer
B.internal water leaks
C.an oil suction line restriction
D.excessive wears of the cooling water pump


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1.單項選擇題The reversing cams of some four-stroke/cycle diesel engines are brought into position by （）

A.sliding the camshaft along its axis
B.rotating the cam 180
C.rotating the cam followers 180
D.moving the idler sprockets in the drive chain

2.單項選擇題A diesel engine is equipped with an isochronous hydraulic governorA decrease in load will cause the engine speed to （）

A.decrease only
B.increase only
C.decrease slightly then returned to original speed
D.increase slightly then returned to original speed

3.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

4.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

5.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