The causes may be unrelated to each other, but all are ___to the effect.

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  A . crack B . knocking C . leaking D . seizure

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  A . leaking unloader B . tripped circuit breaker C . control line leak D . defective pop valve

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• If the engine does start on air, but combustion does not immediately begin, the cause may not be （）.

  A . low compression B . failure of the fuel pump to discharge fuel C . incorrect timing of fuel pump D . turning gear being still o

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• A virtual rise in the center of gravity may be caused by（）.

  A . filling a partially filled tank B . using an on board crane to lift a freely swinging heavy object C . emptying a partially filled tank D . transferring ballast from the forepeak to the after peak

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• Defense plans may cause the operation of electronic aids to navigation to be suspended with （）.

  A . no notice B . one day's notice C . a week's notice D . thirty (30) days notice

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• The reciprocating pump can’t draw water from a tank may be caused by （）.

  A . leaky pipe B . opened inlet valve C . too much water in tank D . None of the above

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• Electrical failures in motors are caused by the breakdown of insulation, which may be caused by （）

  A . penetration of moisture B . accumulation of dirt C . overheating D . All of the above

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• If water is found in the crankcase of a diesel engine, the cause may be due to（）

  A . a cracked cylinder head B . a leaky cylinder head gasket C . a cracked cylinder liner D . any of the above

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• If the refrigeration compressor crankcase is sweating, the cause may be due to （）.

  A . a shortage of refrigerant B . the compressor running continuously C . liquid refrigerant returning to the compressor D . the compressor short cycling on the high pressure cutout

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• Damage caused by lighting，a storm，or a sudden gust of wind may be within the exception of （）.

  A . act of God B . the Queen's enemies C . inherent vice in the goods D . the negligence of the owner of the good

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• If the engine does start on air, but combustion does not immediately begin, the cause may be （）.

  A . failure of the fuel pumps B . starting air pressure too low C . stop valve in air line closed D . the turning gear still engaged

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• A virtual rise in the center of gravity of a ship may be caused by（）.

  A . filling a partially filled tank B . using fuel from a pressed fuel tank C . emptying a partially filled tank D . transferring pipe from the setback area to the pipe rack

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• If a single cylinder relief valve on a diesel engine lists frequently while the engine is running, the cause may be an （）

  A . excessively late injection timing for each cylinder B . incorrectly adjusted intake valve timing C . incorrectly adjusted fuel injector D . incorrectly adjusted intake valve clearance

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• If an auxiliary diesel engine frequently stalls, the trouble may be caused by （）

  A . low exhaust back pressure B . air in the fuel system C . gasket blow-by or leakage D . incorrect assembly of idler spring

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• It may be found that，in certain circumstances，radar beacon emissions can cause（）with the normal radar display，particularly at close range.

  A . unwanted interference B . unexpected figures C . abnormal data D . unwanted informatio

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• If the compression rings on a diesel engine piston become stuck in the ring groove, the cause may be due to（）

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• Goods may be dangerous not merely by reason of the fact that they may endanger the safety of the vessel，but also because they are liable to cause the vessel to be（）.

  A . despatched B . detained C . detected D . delivered

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• If a hydraulic pump is overheating, the cause may be （）.

  A、excessive internal leakage in the pump B、low discharge pressure and fluid flow C、excessive fluid level in the hydraulic reservoir D、operation of the pump at 100% efficiency

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• If the pump for a hydraulic anchor windlass is overheating, the cause may be （）.

  A . excessive drive motor speed B . excessive pump discharge pressure C . too low of a tilting box angle D . insufficient drive motor speed

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• When the normal compression ratio of a diesel engine is not very high, misfiring at light loads may be caused by （）

  A . overloading the engine B . low exhaust valve lift C . excessive cylinder cooling D . insufficient mechanical clearance

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• What may be the cause of “I got in trouble.”?

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• In the author's opinion, the following may cause city people to be unhappy EXCEPT ______.

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• If the engine does start on air, but combustion does not immediately begin, the cause may not be（）

  A．low compression B．failure of the fuel pump to discharge fuel C．incorrect timing of fuel pump D．turning gear being still o

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