單項(xiàng)選擇題A sudden drop in diesel engine cylinder compression pressure can be caused by（）

A.a leaking fuel injector nozzle
B.a clogged air filter
C.excessively early fuel injection
D.malfunctioning valves


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1.單項(xiàng)選擇題Which of the following statements is correct for the design and installation of diesel engine cooling water systems?（）

A.An alarm device with audible and visible signals is required for all cooling water systems
B.Propulsion engines with bores over 200 mm are to be fitted with cooling water jackets
C.Each totally enclosed cooling system shall be provided with a suitable head tank
D.Drain cocks are to be provided at the lowest points of all cylinder water jackets

2.單項(xiàng)選擇題High exhaust back pressure will result in an increase in （）

A.turbocharger efficiency
B.engine power output
C.carbon deposits on fuel injectors
D.cylinder scavenging

4.單項(xiàng)選擇題Trunk type diesel engine pistons are effectively cooled when heat is（）

A.radiated through the engine block
B.transferred to water cooled cylinder walls
C.conducted through the piston crown
D.transferred to escaping exhaust gases

5.單項(xiàng)選擇題Maintaining the proper fuel oil temperature will result in （）

A.the elimination of valve wear
B.improved atomization
C.a decrease in cylinder blow-by
D.an increase in cylinder blow-by