更多"Air or noncondensable gas is remove"的相关试题:
[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]For use as protection from gas leaking from a refrigeration unit，each ship must be equipped with a（）.
A. portable ventilation system
B. flame safety lamp
C. self-contained breathing apparatus
D. gas mask
[单项选择]Hot gas defrosting uses the hot gas from （） to defrost the evaporator.
A. starting air bottles
B. diesel engines
C. boilers
D. refrigeration compressors
[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]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]The fresh air intake of the inert gas system（）.
A. prevents the flue gas from falling below 3% content of oxygen
B. allows the inert gas piping to be used for gas freeing the tanks
C. opens when there is excessive vacuum on the deck water seal
D. enables outside air to mix with and cool hot flue gasses
[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]In an operating refrigeration system low on refrigerant, a liquid line sight glass will（）
A. be clear
B. be blue
C. be light green
D. show bubbles
[单项选择]In terms of pressure and temperature in the refrigerant in the compressor, what happens to the primary?（）
A. its pressure and temperature are both lowered
B. its pressure and temperature are both raised
C. its pressure is lowered and its temperature is raised
D. its pressure is raised and its temperature is lowered
[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]The principal purpose of sub-cooling liquid refrigerant prior to its entering the expansion valve is to （）.
A. increase the refrigerating effect, by decreasing the amount of flash gas
B. allow the refrigerant to enter the throttling device in a saturated condition
C. increase the refrigerating effect by increasing the amount of flash gas
D. minimize the temperature drop of the liquid as it passes through the solenoid valve to the outlet side
[单项选择]Excessive oil foaming in the crankcase of a refrigeration compressor can result in （）.
A. overheated compressor bearings
B. excess lube oil viscosity
C. carbon deposits on the compressor piston rings
D. wax crystals forming in the lubricant
[单项选择]（） device is provided to prevent starting air from being admitted to the cylinder before the reversing is completed.
A. An automatic
B. A transmission
C. A self-regulating
D. An interlocking
[单项选择]Intake air flow from a diesel engine turbocharger is directly proportional to engine（）
A. exhaust gas pressure
B. exhaust gas temperature
C. speed
D. load
[单项选择]Purging air from a hydraulic system is necessary when（）
A. adding small amounts of oil to the system
B. the system has been overheated
C. the system has been drained and then filled with new oil
D. the system has been idle for a long period of time
