更多"If an air compressor is used to sup"的相关试题:
[单项选择]If an air compressor is used to supply compressed air to outlets throughout the engine room and on deck of a vessel, the system is known as the （）.
A. combustion control air system
B. supply air system
C. ships service air system
D. low pressure deck air system
[单项选择]Supply the （）before starting an air compressor.
A. fuel oil
B. cooling water
C. steam
D. power
[单项选择]The compressor in an air-cooled condensing refrigeration system is short cycling on the high pressure cutout switch（）
A. system is overcharged with refrigerant
B. system is low on refrigerant
C. discharge valves are leaking excessively
D. discharge valves are leaking slightly
[单项选择]The air compressor pumps air to the （）.
A. air cylinder
B. combustion chamber
C. steam drum
D. expansion tank
[单项选择]A reciprocating air compressor is running roughly and vibrating excessively, indicating that the （）.
A. compressor is overloaded
B. motor is overloaded
C. foundation bolts are loose
D. belts are too tight
[单项选择]If the electric motor driving an air compressor fails to start, the cause may be a （）.
A. leaking unloader
B. tripped circuit breaker
C. control line leak
D. defective pop valve
[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]Air compressor cylinder un-loaders enable the compressor to （）.
A. vary their speed according to temperature and load
B. start and come up to speed before air compression begins
C. change speed according to overload demands
D. reduce compressed air charge density
[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]The high air velocity leaving the compressor of an exhaust gas turbocharger is converted to pressure in the （）
A. inlet nozzle ring
B. turbine wheel blade
C. diffuser passages
D. inlet vol
[单项选择]Open the （）before starting an air compressor.
A. unload valve
B. cooling water
C. oil cup
D. sump
[单项选择]The purpose of an air compressor unloading device is to （）
A. drain water from the air receiver
B. drain water from the cylinders
C. delay the compression process until the motor is up to speed
D. check pump alignment
[单项选择]An un-loader is installed on an air compressor to （）.
A. bypass the high pressure stage to the low pressure stage on 100% of the air compressors in service
B. prevent excessive inter-stage pressure buildup
C. control compressor discharge pressure
D. remove all but the frictional load during starting
[单项选择]During working of an air compressor, （） should be drained.
A. inter cooler
B. cylinder
C. outlet pipe
D. inlet pipe
[单项选择]Before starting an air compressor, It should be （）.
A. unloaded
B. primed
C. filled with water
D. greased
[单项选择]A dirty intercooler on an air compressor will cause （）.
A. damage to the un-loader operating diaphragm
B. an increase in current flow to the motor
C. high pressure in the receiver and filter
D. an excessive consumption of crankcase oil
