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发布时间:2023-10-11 05:03:23

[单项选择]Under which of the listed conditions can the engine room retake the throttle control from the bridge().
A. Any time it is deemed necessary
B. Only with the masters permission
C. After a 10 minute delay to the input command
D. Only after the throttle has been placed in stop

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[单项选择]Which of the conditions listed would cause simultaneous high cylinder firing pressure and low exhaust temperature?()
A. Improper fuel rack positioning
B. Lengthy opening of the exhaust valve
C. Excessively early injection timing
D. Extended light load operation
[单项选择]Which of the conditions listed represents the greatest effect of excess frost accumulation on the evaporator coils?()
A. Keeps the refrigerated space cooler
B. Reduces the efficiency of the plant
C. Takes the load off the compressor
D. Has no affect on the system
[单项选择]Which of the conditions listed could cause the cylinder relief valves on a large, low-speed, propulsion diesel engine to lift?()
A. Plugged injector nozzles
B. Excessive fuel injection
C. Very late injection timing
D. Incorrect crankshaft clearance
[单项选择]Which of the conditions listed will cause a refrigeration compressor to run constantly without simultaneously decreasing the temperature in the refrigerated space?()
A. Shortage of refrigerant oil
B. Slight shortage of refrigerant
C. Excessive condenser cooling water flow
D. Faulty expansion valve
[单项选择]Which of the conditions listed may occur in an operating diesel engine if air pockets form within the cylinder head circulating water passages? ()
A. Hydraulic stress and distortion will develop
B. Hot spots will develop
C. Fuel oil viscosity will increased
D. An increase in trapped deposits of scale and dirt
[单项选择]Which of the listed conditions can lead to cavitation气穴in a centrifugal pump?()
A. Vapor pockets formed in the suction flow stream
B. Rough easing volute surfaces
C. Worn wearing rings
D. Heavy fluid in the flow stream
[单项选择]Which of the listed conditions can cause a diesel engine to use too much lube oil?()
A. Dirty lube oil filter
B. Too much piston ring wear
C. High lube oil viscosity
D. Low lube oil temperature
[单项选择]Which of the listed conditions can cause lacquer to be deposited on a piston skirt?()
A. High sulphur content fuel
B. High lube oil temperatures
C. High vanadium content fuel
D. Excessive piston slap
[单项选择]Which of the listed conditions can be considered as the single greatest cause of accidents?()
A. Speed
B. Excessive knowledge or skill
C. Human error
D. Excitement
[单项选择]Which of the listed conditions can be used to determine if lube oil has been diluted by fuel? ()
A. Viscosity is decreased
B. Octane number is altered
C. Pump speed is decreased
D. Blower’s speed is decreased
[单项选择]Which of the listed conditions will affective pressure the most in the cylinder of a diesel engine?()
A. TBN of the lubricating oil
B. Temperature of the lube oil
C. Completeness in the mixing of the fuel and air
D. Temperature of the cooling (sea) water
[单项选择]Which cause of the following can lead to the engine not to start on air?()
A. starting air pressure too high
B. correct timing of starting air valves
C. three of the starting valves stuck
D. the turning gear disengaged
[单项选择]Which of the listed operating conditions would have the greatest effect on the volumetric efficiency of an operating reciprocating air compressor?()
A. The density of the air entering the compressor
B. The temperature of the air entering the compressor
C. The designed rotating speed of the compressor
D. A leaking head gasket
[单项选择]Which of the listed conditions will cause the feed water that has not flashed to vapor in the first-stage of a flash evaporator, to flow into the second-stage?()
A. Gravity siphon effect
B. Higher vacuum in the second-stage
C. Difference in brine density between first and second stages
D. lower pressure in first-stage
[单项选择]Which of the listed set of conditions indicates early fuel injection timing?()
A. Loss of engine power and high exhaust temperatures
B. Higher than normal firing pressure and low exhaust temperatures
C. High fuel consumption and high exhaust temperatures
D. Lower than normal compression pressure and high exhaust temperature
[单项选择]Which of the listed conditions will occur if a diesel engine exhaust valve is leaking?()
A. Loss of compression for that cylinder
B. Misfiring or rough running
C. Damage to the valve
D. All of the above
[单项选择]The conventions under which the port state control inspection is carried out include all the following except ().
A. SOLAS 74
B. MARPOL 73/78
C. STCW 78/95
D. ISM Code
[单项选择]You should conduct a sector search under which of the following circumstances().
A. The search target is sighted and then lost
B. More than one vessel is available for a search
C. The search object is a target that will be readily detected by radar
D. An aircraft is available to assist a surface vessel
[单项选择]Which parameter can be tuned to affect the selection of a static route as a backup.when a dynamic protocol is also being used?()
A. link bandwidth
B. hop count
C. link cost
D. administrative distance
E. link delay

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