單項選擇題The color of the exhaust from a diesel engine should be （）

A.clear
B.hazy light brown
C.hazy light blue
D.hazy light grey


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1.單項選擇題Scavenging in a four-stroke/cycle diesel engine occurs during the （）.

A.last part of the exhaust stroke, and the first part of the intake stroke
B.last part of the intake stroke only
C.early part of the injection stroke only
D.early part of the power stroke

2.單項選擇題The device allowing for the change in volume of the cooling water in a propulsion diesel engine closed cooling system is the （）.

A.fresh water expansion tank
B.sea water expansion tank
C.thermostatic expansion valve
D.jacket water cooler accumulator

3.單項選擇題Which of the following statements is true concerning an oil cooler?（）

A.The oil temperature is less than the cooling water temperature
B.The oil pressure is less than the cooling water pressure
C.The oil pressure is greater than the cooling water pressure
D.The oil flow control valve is always installed in the oil input line

4.單項選擇題One method of constructing large marine diesel engines and reducing the total engine frame weight is through （）.

A.casting interlocking components
B.welding plates to form sections for assembly
C.forging integral components
D.case hardening integral components

5.單項選擇題Prior to lighting off a cold automatically fired auxiliary boiler, you should （）.

A.check and regulate the water level
B.close the air cock once fires are lit
C.blowdown the gage glass
D.crack the steam stop to assure protective steam flow