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單項(xiàng)選擇題If the engine can be started and maneuvered on high viscosity fuel, the （）of the fuel reaching the injectors should be raised to such a point that the viscosity is less than the required value, ie27c St.

A.pressure
B.temperature
C.viscosity
D.density

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1.單項(xiàng)選擇題On engines having oil cooled pistons the lubricating oil pre-heater must be put into operation and the rate of heating so （） that the temperature of the piston cooling oil returns are 32℃ to 35℃ over a period of at least two hours.

A.slow
B.quick
C.arranged
D.high

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2.單項(xiàng)選擇題Too much excess air is （）because the heat generated is being lost through the exhaust trunking instead of being made used of in heating the water to produce steam.

A.not good
B.good
C.better
D.the best

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3.單項(xiàng)選擇題（） the oxygen content in the exhaust gas, （） the combustion is.

A.The lower；the worse
B.The higher；the better
C.The lower；the better
D.The highest；the worst

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4.單項(xiàng)選擇題Injectors on modern engines are cooled by a combination of the intensive bore cooling in the cylinder by a combination of the intensive bore pockets and by the fuel which is re-circulated through the injector when the follower is on the （）of the cam or when the engine is stopped.

A.slope
B.base
C.top
D.bottom

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5.單項(xiàng)選擇題Fuels of different qualities may require advancing or retarding the injection timing, in addition to which if the injection timing is advanced when the engine is running at loads below the （）, then a saving in fuel can be achieved.

A.BHP
B.MCR
C.IHP
D.MEP

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