更多"Air compressor cylinder un-loaders "的相关试题:
[单项选择]If an air compressor is used to supply air primarily to the combustion control system and other pneumatic controllers, the entire system is known as the （）.
A. control air system
B. forced draft air system
C. supply air system
D. ships service air system
[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]（） 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
[单项选择]The loss of the diesel engine cylinder air charge through leaky valves, piston rings, worn or scored liners, would be indicated by which of the following sets of conditions?（）
A. Low compression pressure and high exhaust temperature
B. Low firing pressure and high exhaust temperature
C. Low compression pressure and low exhaust temperature
D. Low firing pressure and low exhaust temperature
[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]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]The cylinder contains a great weight of air and is capable of burning a great quantity of fuel at（）.
A. the beginning of the compression stroke
B. the beginning of the suction stroke
C. the end of the working stroke
D. the end of the exhaust stroke
[单项选择]The starting air entering the cylinder begins when the piston（）
A. has nearly come to the TDC
B. has just past the TDC
C. has nearly come to the BDC
D. has just past the BDC
[单项选择]Pressurized air enters the cylinder via the inlet ports and pushes the remaining exhaust gas from the cylinder in a process known as “（）”.
A. charging
B. super charging
C. scavenging
D. exhausting
[单项选择]Bad valves operation of the reciprocating air compressors can be detected by observation of （）.
A. the discharge temperature low
B. the discharge temperature high
C. the discharge pressure rise
D. the inter-stage pressure low
[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]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
[单项选择]If a reciprocating air compressor has a knock occurring in frequency with its operating RPM, the cause is probably （）.
A. misalignment or worn main bearings
B. insufficient cylinder lubrication
C. defective or poorly fitted valves
D. all of the above
[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]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
