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单选题
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
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考题
If a reciprocating air compressor has a knock occurring in frequency with its operating RPM, the cause is probably _____.A.misalignment or worn main bearingsB.insufficient cylinder lubricationC.defective or poorly fitted valvesD.All of the above
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What is the most probable cause of reduced capacity in a reciprocating air compressor ________．A.Carbon on cylinder headsB.Faulty unloaderC.Leaking air valvesD.Plugged air cooler
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单选题Excessive lube oil consumption by a reciprocating air compressor can be caused by （）.A
using a slightly dirty air filterB
using oil having an excessive viscosityC
intercooler or after-cooler leaksD
carrying the oil level higher than normal
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单选题Air blowing from the intake air filter of an operating air compressor indicates （）.A
broken inlet valvesB
broken discharge valvesC
pulsations in the air distribution systemD
overloading of the air distribution system
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单选题Condensate must be drained from the intercooler and after-coolers of an air compressor because （）.A
the cooling effect of the condensate reduces the compressors efficiencyB
a danger of explosion exists whenever water is present in a compressorC
water causes erratic operation of pneumatic componentsD
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单选题The unloading system on an air compressor will （）.A
increase compressor discharge pressure on demandB
increase compressor operating speed as necessaryC
allow the motor to turn the compressor opposed only by frictionD
reduce the compressor frictional load when starting
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单选题（）are supplied by main switchboard directly.A
Suez Canal searchlight, air compressor and air conditioning compressorB
Air compressor, boiler blower and refrigeration plantC
Boiler blower, Suez Canal searchlight and refrigeration plantD
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单选题Broken valve strips in an operating low pressure, air compressor will cause （）.A
an immediate crankcase explosionB
oil contamination in the compressed airC
a decrease in compressor capacityD
no immediate loss of the compressed air capacity
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单选题If the electric motor driving an air compressor fails to start, the cause may be a （）.A
leaking unloaderB
tripped circuit breakerC
control line leakD
defective pop valve
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单选题Which of the following problems could cause air to blow out through the inlet air filter of a running compressor?（）A
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A broken intake valveC
A dirty inlet filter elementD
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单选题Which of the following problems can cause an above normal air temperature to develop in the intake manifold of a turbocharged and after-cooled diesel engine?（）A
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单选题An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.A
oil foaming in the compressorB
higher than normal suction and discharge pressures with a higher box temperatureC
higher than normal discharge pressure with a normal box temperatureD
the compressor to run continuously
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单选题The air compressor pumps air to the （）.A
expansion tankB
combustion chamberC
air receiverD
evaporator
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单选题The air compressor pumps air to the （）.A
air cylinderB
combustion chamberC
steam drumD
expansion tank
考题
单选题The air compressor pumps air to the（）.A
engine cylinderB
air bottleC
evaporatorD
condenser
考题
单选题The air filter is fixed in the （） of an air compressor.A
inlet pipeB
outlet pipeC
inter coolerD
after cooler
考题
单选题A dirty intercooler on the ship service air compressor will result in （）.A
decreased compression ratioB
higher than normal power consumptionC
un-loader malfunctionD
water in the lubricating oil
考题
单选题The air charge leaving an intercooler, or after-cooler of an air compressor can be expected to be （）.A
superheatedB
super-cooledC
at or below the dew pointD
All of the above
考题
单选题If a reciprocating air compressor has a knock occurring in frequency with its operating RPM, the cause is probably （）.A
misalignment or worn main bearingsB
insufficient cylinder lubricationC
defective or poorly fitted valvesD
all of the above
考题
单选题Air compressor cylinder un-loaders enable the compressor to （）.A
vary their speed according to temperature and loadB
start and come up to speed before air compression beginsC
change speed according to overload demandsD
reduce compressed air charge density
考题
单选题An air compressor can be unloaded at start-up by （）.A
holding the discharge valve openB
relieving the intercooler pressure to the atmosphereC
using an enlarged, permanently opened clearance expansion spaceD
a pre-charged accumulator
考题
单选题Excessively low air pressure occurring in the intercooler of a reciprocating air compressor is caused by（）.A
leaky discharge valves on the LP cylinderB
leaky discharge valves on the HP cylinderC
insufficient intercooler coolingD
low ambient air pressure
考题
单选题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 systemB
forced draft air systemC
supply air systemD
ships service air system
考题
单选题Which of the following problems would be the probable cause for the faulty operation of a reciprocating air compressor suction valve?（）A
Carbon build up in the piston ring beltB
Faulty operation of a cylinder un-loaderC
Compressor operation in an area of high relative humidityD
Lifting of intercooler rebel valve
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