單項(xiàng)選擇題The ignition quality of a fuel oil is an important operational consideration because it()

A.indicates the amount of abrasive material in the fuel
B.affects the starting ability of a cold engine
C.determines the amount of fuel penetration engine
D.affects the compression ratio of an operating engine


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1.單項(xiàng)選擇題On a large low-speed main propulsion diesel engine, lower main bearing wear is usually measured by using a/an ()

A.dial indicator
B.outside caliper
C.bridge gauge
D.tram rod

3.單項(xiàng)選擇題The ignition quality of a diesel fuel is indicated by the ()

A.cetane number
B.volatility point
C.viscosity index
D.octane number

4.單項(xiàng)選擇題The ignition quality of a diesel fuel oil is indicated by the ()

A.specific gravity
B.cetane number
C.viscosity
D.calorific valve

5.單項(xiàng)選擇題Which of the following conditions could contribute to the cracking of a diesel engine cylinder head?()

A.Leaking seal ring
B.Insufficient heat transfer from the exhaust valves
C.Block cooling water passages to the head
D.Excessive scavenging air provided to the engine