單項(xiàng)選擇題Which of the following statements is true concerning the cetane number of diesel fuel?()

A.The cetane number affects the amount of injection lag
B.The cetane number is an indication of the fuels viscosity
C.Ignition lag is reduced with fuels having a high cetane number
D.The cetane number is of little significance in the combustion process


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1.單項(xiàng)選擇題Fuel oil having a low cetane rating could result in()

A.improved cold weather starting
B.excessive fuel oil consumption
C.reduced ignition lag
D.smoother engine operation

2.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

3.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

5.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