网友您好， 请在下方输入框内输入要搜索的题目：
题目内容
（请给出正确答案）
单选题
The sudden reduction of pressure occurring within the crankcase of a refrigeration compressor during starting causes the （）.
A
sudden evaporation of wax crystals in the lubricant
B
sudden evaporation of entrapped air in the lubricant
C
release of refrigerant from the oil/refrigerant mixture
D
release of dissolved lubricant from the refrigerant
参考答案
参考解析
解析：
暂无解析
更多 “单选题The sudden reduction of pressure occurring within the crankcase of a refrigeration compressor during starting causes the （）.A sudden evaporation of wax crystals in the lubricantB sudden evaporation of entrapped air in the lubricantC release of refrigerant from the oil/refrigerant mixtureD release of dissolved lubricant from the refrigerant” 相关考题
考题
A diesel engine experiences a sudden loss in speed, accompanied by black exhaust smoke, with the fuel rack at maximum, and speed remaining below normal .the probable ___.A.engine overloadB.leaky valvesC.stuck or broken piston ringsD.low air injection pressure
考题
Before performing any maintenance on a hydraulic system storing energy in an accumulator, you shouldA.pressurize the system to test for leaksB.bleed off all pressure within the systemC.operate the machine until it reaches normal temperatureD.disconnect the pump pressure control switch
考题
If a heavy sea strikes the rudder, the shock is transmitted through ___ to the rams, this cause a sudden increase in oil pressure in one of the cylinders.A.the control rodB.the hunting gearC.the floating ringD.the tiller arm
考题
Wear occurring at the tips of the reduction gear teeth is usually the result of ______.A.surface fatigueB.fretting corrosionC.heavy overloadingD.gear misalignment
考题
Restrictions occurring in the small orifices(孔) of pneumatic control system components can be caused by ______.A.moisture in the compressed air supplyB.excessive dryness in the compressed air supplyC.pressure surging in the compressed air receiverD.insufficient lubrication of the system components
考题
Damage caused by lighting，a storm，or a sudden gust of wind may be within the exception of ______.A.act of GodB.the Queen's enemiesC.inherent vice in the goodsD.the negligence of the owner of the goods
考题
单选题Condensate formed within the first-effect tube nest of a double-effect,low pressure evaporator, is removed by a （）.A
series of bafflesB
crossover pipeC
condensate separatorD
drain pump
考题
单选题The text supplies information to answer which of the following questions?A
How does the reduction of space affect intragroup aggression among monkeys in an experimental setting?B
Do family units within a monkey social group compete with other family units for food?C
What are the mechanisms by which the social order of an established group of monkeys controls aggression within that group?D
How do monkeys engaged in aggression with other monkeys signal submission?
考题
单选题A diesel engine experiences a sudden loss in speed, accompanied by black exhaust smoke, with the fuel rack at maximum, and speed remaining below normal the probable（）A
engine overloadB
leaky valvesC
stuck or broken piston ringsD
low air injection pressure
考题
单选题Your facsimile prognostic chart indicates that you will cross the cold front of a low pressure system in about 24 hours.You should（）.A
Expect to see cirrus clouds followed by altostratus and nimbostratus cloudsB
Alter course to remain in the navigable semicircleC
Prepare for gusty winds，thunderstorms，and a sudden wind shiftD
Expect clear weather，with steady winds and pressure，until the front passes
考题
单选题The domestic fresh water pump starters are controlled by pressure switches which operate when the pressure in the tank varies within predetermined limits as water is drawn offThe word “which” means （）.A
startersB
pressure switchesC
pressureD
water
考题
单选题A sudden drop in diesel engine cylinder compression pressure can be caused by（）A
a leaking fuel injector nozzleB
a clogged air filterC
excessively early fuel injectionD
malfunctioning valves
考题
单选题When a sudden increase in steam demand occurs from the boiler, the water level in the drum at the higher pressure will（）A
rise quicklyB
rise slowlyC
drop quicklyD
drop slowly
考题
单选题A probable cause for a turbo generator tripping out on overspeed is a sudden（）A
loss of field excitationB
total loss of loadC
large increase in loadD
loss of steam pressure
考题
单选题When a sudden increase in steam demand comes to normal, the drum pressure will and water level in the drum will（）.A
rise, rise alsoB
rise, dropC
drop, riseD
drop, drop also
考题
单选题Air trapped in the hydraulic fluid of a steering system may be indicated by（）A
the steering pumps overspeedingB
a jammed open relief valeC
a constantly occurring improper rudder responseD
excessive ram pressure
考题
单选题If a heavy sea strikes the rudder, the shock is transmitted through （） to the rams, this cause a sudden increase in oil pressure in one of the cylinders.A
the control rodB
the hunting gearC
the floating ringD
the tiller arm
考题
单选题One cause of high head pressure occurring in a refrigeration system can be （）.A
insufficient cooling water flow to the condenserB
a low refrigerant charge in the systemC
the liquid valve is open too muchD
high evaporator superheat
考题
单选题Critical speeds occurring within the operating speed range of a main propulsion diesel engine may be changed, or have their damaging effects reduced by a/an （）A
engine support vibration isolatorB
detuner or viscous fluid damperC
lightened crankshaft flywheelD
spherically seated crankshaft bearing
考题
单选题The pressure in an operating diesel engine cylinder continues to rise for a short period after the piston passes top dead center as a result of the （）A
expansion of the combustion gasesB
exhaust and intake valves just closingC
maximum compression is just being attainedD
fuel injection occurring at that point and combustion begins
考题
单选题To guarantee that a reduction gear bearing is receiving proper oil supply, you should check the （）A
lube oil temperature at the cooler outletB
lube oil strainer magnets bearingC
lube oil temperatureD
lube oil pressure to the bearing
考题
单选题Wear occurring at the tips of the reduction gear teeth is usually the result of （）.A
surface fatigueB
fretting corrosionC
heavy overloadingD
gear misalignment
考题
单选题To maintain the down stream pressure within defined limits over a range of flow and despite any changes in supply pressure, （） is fitted.A
a check valveB
a gate valveC
a pressure reducing valveD
a quick closing valve
考题
单选题A sudden drop in compression pressure in one cylinder of a diesel engine can be caused by（）A
a leaking fuel injector nozzleB
a clogged air filterC
excessively early fuel injectionD
malfunctioning valves
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Damage caused by lighting，a storm，or a sudden gust of wind may be within the exception of （）.A
act of GodB
the Queen's enemiesC
inherent vice in the goodsD
the negligence of the owner of the goods
热门标签
最新试卷
