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單項選擇題Start the turning gear, and with some one hand-operating the cylinder lubricators at regular intervals, and with the indicator cocks （）, and with the control gear in the （）position, give the engine at least one complete turn.

A.open；“stop”
B.closed；“stop”
C.open；“start”
D.closed；“start”

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1.單項選擇題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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2.單項選擇題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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3.單項選擇題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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4.單項選擇題（） 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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5.單項選擇題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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