更多"A non-return valve in the air deliv"的相关试题:
[单项选择]A （） in the air delivery line near to each compressor is essential.
A. butterfly valve
B. globe valve
C. gate valve
D. non-return valve
[单项选择]The purpose of the delivery check valve used in a diesel fuel injection jerk pump is to （）.
A. assist in a quick cutoff of fuel injection
B. allow oil backflow from the injector to the helix
C. reduce fuel oil pressure between injection strokes
D. meter the quantity of fuel delivered
[单项选择]Air line lubricators are used in compressed air systems to lubricate （）.
A. the suction and discharge valves
B. tools and equipment served by compressed air
C. air line reducing valves
D. all of the above
[单项选择]If an electric motor driven air compressor fails to start, it may be due to a （）.
A. leaking discharge valve
B. jammed suction valve
C. tripped overload relay
D. broken discharge un-loader
[单项选择]The primary task of the compressed air system is to deliver the starting air necessary for （）
A. starting the ME
B. starting the emergency electric alternator
C. driving the main turbine
D. driving the turbocharger
[单项选择]With ducted air conditioning systems, the modern tendency is to use（）
A. central air conditioning system
B. high velocity system
C. low velocity system
D. single duct system
[单项选择]During the manufacture of line，yarns are twisted together in the（）.
A. opposite direction from which the fibers are twisted together to form strands
B. same direction the fibers are twisted to form strands
C. opposite direction from which the fibers are twisted together to form the line
D. opposite direction from which the fibers are twisted together forming cables
[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 air-conditioner is running in the winter and to be stopped, we should（）
A. close Fan and Humidifier at the same time
B. firstly close Fan and then close humidifier immediately
C. firstly close humidifier and then close Fan immediately
D. firstly close humidifier and then close Fan after 30 seconds
[单项选择]What term indicates the line drawn at the top of the flat plate keel（）.
A. Base line
B. Molded line
C. Designer's waterline
D. Keel line
[单项选择]A mooring line leading at nearly right angles to the keel is a（）.
A. bow line
B. breast line
C. spring line
D. stern line
[单项选择]Air receivers installed in starting air systems are to be （）.
A. cylindrical in shape with service connections located at the top and bottom
B. opened and made available for inspection during biannual inspections provided
C. with automatic drain traps for the removal of moisture
D. so installed as to make the drain connections effective under extreme conditions of trim
[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]Compressed air is supplied by air compression to （）.
A. the air receivers
B. the starting valves
C. the cylinder covers
D. the distributors
[单项选择]Air conditioning is the process of treating air to control （） its temperature, humidity, cleanliness and distribution to meet the comfort requirements of the occupants of the conditioned space.
A. instantaneous
B. instantaneously
C. simultaneous
D. simultaneously
[单项选择]In reference to air conditioning, when air attains the maximum amount of moisture it can hold at a specific temperature, it is said to be （）.
A. superheated
B. saturated
C. condensed
D. convected
[单项选择]The quantity of cooled air delivered by an air conditioning unit should （） the sum of the quantity of air re-circulated to the unit and the quantity mechanically exhausted.
A. balance
B. not balance
C. be more than
D. be less than
[单项选择]（） supplies pilot air to control the cylinder air start valves.
A. An air compressor
B. An indicator cock
C. An air distributor
D. A safety valve
