问题：
[单选] A restricted air intake to a diesel engine may result in the engine （）.
failing to reach rated speed。knocking under maximum load。hunting or surging under light load。overspeeding and running away。
问题：
[单选] In a four-stroke/cycle diesel engine, the camshaft rotates at （）
twice the crankshaft speed。half the crankshaft speed。the same speed as that of the crankshaft。a speed independent of that of the crankshaft。
问题：
[单选] For diesel engine piston cooling, lubricating oil can be supplied to the pistons by a/an （）.
oil spray。oil bath。oil control rings。drilled passage through the camshaft。
问题：
[单选] The jacket water temperature in a diesel engine closed freshwater cooling system is normally controlled by （）
regulating the level of corrosion inhibitor in the primary cooling system。the level of the freshwater expansion tank。varying the engine load to meet temperature requirements。the operation of the thermostatic valve。
问题：
[单选] On a turbo-charged, medium-speed diesel engine, which of the following problems is an indication of a restricted air intake passage?（）
Engine is hard to start。Engine misses。Surges at governed RPM。Coolant temperature is too low。
问题：
[单选] The water in an operating auxiliary boiler should be tested for alkalinity and chloride content each（）.
hour。day。week。month。
问题：
[单选] An indication of a diesel engine air intake being partially clogged, is （）.
low firing pressure and low exhaust temperatures。low firing pressure and normal exhaust temperatures。high firing pressure and low exhaust temperatures。high firing pressure and high exhaust temperature。
问题：
[单选] If a four-stroke/cycle diesel engine is running at 1550 RPM, the speed of the camshaft will be（）.
525 RPM。775 RPM。1550 RPM。1800 RPM。
问题：
[单选] If over a period of weeks the air-box pressure of a turbo-charged, diesel engine, operating at full load, appears to be dropping off, the cause can be （）.
open air-box drains。loss of cooling water to the diffuser。gradual fouling of the air filters。improperly timed exhaust valve。
问题：
[单选] Before an auxiliary boiler is shutdown for an extended period of time, the water in the boiler should have a pH value of （）.
10。7。4。1。
