單項選擇題A fuel-air mixture below the lower explosive limit is too（）.

A.rich to burn
B.lean to burn
C.cool to burn
D.dense to burn


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1.單項選擇題One major disadvantage of a low-speed diesel as compared to a steam main-propulsion system is（）.

A.the extra weight required for the diesel reduction gearing
B.a minimum speed for the engines that limits the minimum speed of the vessel
C.the higher fuel consumption per SHP
D.the low efficiency of the system when a controllable pitch propeller is used

2.單項選擇題Most medium and slow speed diesels are started by what medium?（）

A.Electric starting motors
B.Hydraulics
C.Compressed air
D.Ether

3.單項選擇題Storage batteries on T-Boats must be located（）.

A.in sight of the main engine(s)
B.in a tray lined with suitable material that resists damage from the electrolyte
C.in locked closets with restricted ventilation
D.near the bilge to lower the center of gravity and improve stability

4.單項選擇題What is the purpose of the intake/exhaust valves in a diesel engine? （）

A.They regulate the combustion cycle
B.They supply cooling water
C.They synchronize the ignition spark
D.They supply and regulate the lubricant flow

7.單項選擇題How would the exhaust of a properly operating diesel engine appear?（）.

A.Light blue haze
B.Light brown haze
C.Light gray haze
D.Perfectly clear

8.單項選擇題What is the operating principal of a flash type evaporator?（）

A.Sea water is heated to boiling temperature under a vacuum
B.Sea water is passed over heated plates in a thin film
C.Heated sea water is injected into a vacuum chamber
D.Sea water is forced through a heated eductor

9.單項選擇題What condition will result in the automatic shutdown of a diesel engine? （）

A.High jacket water pressure
B.High lube oil pressure
C.Low lube oil pressure
D.Excessive turbo charger speed

10.單項選擇題On a single-screw vessel the stern frame（）.

A.furnishes support to the rudder，propeller shaft，and transom frame
B.provides foundations for after mooring winches
C.provides foundations for the main propulsion engines
D.transfers the driving force of the propeller to the hull