更多"Purging air from a hydraulic system"的相关试题:
[单项选择]The purging of air from an elector-hydraulic steering gear unit is necessary when（）
A. changing over to hand pump operation
B. engaging the trick wheel
C. the system has been filled with new oil
D. the rudder angle indicator does not match the helm position
[单项选择]The process of removing moisture from air is known as（）.
A. humidification
B. dehumidification
C. vaporization
D. evaporation
[单项选择]The engine is started with （） supplied from air receivers.
A. pressure oil
B. pressure water
C. compressed air
D. cooling water
[单项选择]To prevent the riser system from buckling under its own weight，upward tension is provided by the（）.
A. riser stabilizers
B. guideline tensioning system
C. riser tensioning system
D. guideline stabilizers
[单项选择]Air blowing from the intake air filter of an operating air compressor indicates （）.
A. broken inlet valves
B. broken discharge valves
C. pulsations in the air distribution system
D. overloading of the air distribution system
[单项选择]Air entering an air-cooled refrigeration system is indicated by （）.
A. frosting of the liquid line
B. higher than normal head pressure
C. a clear sight glass
D. abnormally cold reefer boxes
[单项选择]The unloading system on an air compressor will （）.
A. increase compressor discharge pressure on demand
B. increase compressor operating speed as necessary
C. allow the motor to turn the compressor opposed only by friction
D. reduce the compressor frictional load when starting
[单项选择]When operating the air supply system in a covered lifeboat the（）.
A. fuel supply valve should be closed
B. hatches，doors，and oar ports should be closed
C. air cylinder shut-off valve should be closed
D. engine should be shut off
[单项选择]The loss of （） from an air compressor could lead to an overheated air discharge and possibly an explosion in the pipelines leading to the air reservoir.
A. lubricating oil
B. compressed air
C. cooling water
D. sealing ring
[单项选择]The starting air system usually has （） to prevent starting if anything is not in order.
A. drain cocks
B. vent valves
C. counteracts
D. interlocks
[单项选择]A knocking sound emitted from an unloaded air compressor is probably caused by （）.
A. damaged intake valves
B. excessively tight mounting bolts
C. insufficient cylinder lubrication
D. a loose piston
[单项选择]A re-heater in an air conditioning system functions to （）.
A. control inlet air temperature
B. control inlet air volume
C. maintain relative humidity at 15%
D. restore conditioned air temperature to a comfortable level
[单项选择]In an air conditioning system, low head pressure associated with a reciprocating compressor can be the result of （）
A. broken valve springs
B. tight drive belts
C. high line voltage
D. air in the system
[单项选择]Air compressors are equipped with unloading systems for the purpose of（）.
A. removing all but the frictional load during starting
B. relieving intercoolers of high temperature buildups
C. providing high starting torque in the drive motor
D. seating valve plates during compressor shutdown
[单项选择]The closed-loop system differs from the open-loop system by（）
A. the lack of a feedback
B. the presence of a feed back
C. the lack of a computer
D. the presence of a computer
[单项选择]The air required for combustion is taken from the engine room through a filter fitted on the turbochargerThis reduces the risk for too and contamination of the combustion air（）
A. high temperatures
B. low temperatures
C. wet
D. dirty
[单项选择]In an air conditioning system, moisture is removed from the air by（）
A. filers
B. separators
C. ducted traps
D. dehumidifiers
[单项选择]Diesel engine air start system check valves are opened by （）
A. an air start cam
B. cylinder compression pressure
C. starting air pressure
D. valve springs
