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发布时间:2024-01-10 22:00:00

[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

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[单项选择]Which of the listed materials would be considered as a bunting class "C" fire?()
A. Fuel oil
B. Wood
C. Celluloid
D. Electrical insulation
[单项选择]Which of the listed devices would be installed at a control system air pressure reducing station?()
A. Moisture separator
B. Vacuum breaker
C. Lubricator
D. Non-return valve
[单项选择]Which of the listed problems would be indicated by an accumulation of water in one cylinder, in addition to the crankcase of an idle diesel engine?()
A. Excessive cylinder liner
B. water in the fuel system
C. Cracked cylinder liner
D. Leaking lube oil cooler
[单项选择]If ignited, which of the listed materials would be a class "B" fire?()
A. Magnesium
B. Paper
C. Wood
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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 problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?()
A. Thermal expansion valve frozen open
B. Suction gas heat exchanger bypassed
C. Condenser clogged or fouled
D. High pressure cutout switch inoperative
[单项选择]Which of the following would cause a diesel to have black smoke?()
A. leaky injector
B. water in the gas
C. too heavy oil
D. water in the oil
[单项选择]Which of the listed burning materials would be described as a class "B" fire?()
A. Acetylene
B. Lube oil
C. Grease
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[单项选择]Which of the following operating conditions can occur when shims are removed from the joint between the foot of a marine type diesel engine connecting rod and the bearing box?()
A. Decreased connecting rod bearing clearance
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[单项选择]Which of the processes listed would be the most satisfactory method to use to lower the humidity of the air being circulated by an air conditioning system?()
A. Cooling the air to a temperature just above dew point
B. Heating the air to a point at which moisture will boil off ,then re-cooling it
C. Cooling the air to a point below dew point, then reheating it
D. Heating the air and then cooling it to a point below dew point
[单项选择]In which of the areas listed would you expect to find the highest salt concentration in a flash evaporator?()
A. Distiller air ejector cooling medium
B. Saltwater heater discharge
C. First-stage internal feed box
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[单项选择]Which of the listed pressure control valves would be used to establish the maximum operating pressure of a hydraulic system?()
A. Pressure-reducing valve
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C. Counterbalance valve
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[单项选择]Which of the listed classes of fire would most likely occur in the engine room of a vessel?()
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[单项选择]The vessel or other goods upon which the Works have been carried out must be()from the Repairer’s worksite within 3 days after the invoice date or in accordance with other written notification by the Repairer to the Customer.
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B. on deck
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[单项选择]Sue and Labor is to()a loss which would be recoverable under PICC Hull Insurance Clauses.
A. avert or minimize
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[单项选择]Operating conditions in the crank chamber are very () those in the cylinder.
A. the same as
B. similar to
C. separated from
D. different from

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