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
Under normal conditions, the quantity of air circulation becomes less and less.What is the reason?（）
A
dirty delivery ducts
B
too much refrigerant
C
the fouling filters
D
high temperature outside
参考答案
参考解析
解析：
暂无解析
更多 “单选题Under normal conditions, the quantity of air circulation becomes less and less.What is the reason?（）A dirty delivery ductsB too much refrigerantC the fouling filtersD high temperature outside” 相关考题
考题
Unless economic conditions improve next year, _____ widespread unrest in the United States.A. there would beB. there should beC. there isD. there will be
考题
题干材料：Due to the large amount of heat picked up by the air in boiler and engine rooms, it would be impracticable to maintain ambient conditions within the comfort zone by air conditioning or any other means. The normal practice is to provide copious mechanical ventilation; in boiler rooms, the quantity is equated to the combustion requirements, while in a motor ship engine room the supply may be 25-50% in excess of the requirements of the engines.The axial flow fan is particularly suited to handle these large air volumes at the moderate pressures required, while of course the “straight-through” flow feature places it at an advantage over the centrifugal fan.The increasing adoption of automation, with the provision of a separate control room makes less significant the fact that comfort conditions cannot be maintained in the engine room all the time.问题：Which of the following devices should be taken to maintain ambient conditions of the boiler and machinery space?A.air compressorB.air coolerC.air-conditioning plantD.mechanical ventilation plantIn a motor vessel, the air quantity which the engine room need is_______ of the requirements of the engines.A.less than 25-50%B.more than 125-150%C.more than 25-50%D.less than 125-150%According to this passage, which of the following statements is true?A.In boiler and machinery spaces, there is the air conditioningB.In the boiler rooms the requirement of air volume should meet 25-50% of combustion requirementC.To maintain the comfort zone in the separate control room the air conditioning plant should be fittedD.The comfort conditions can be maintained in the engine room all the timeAt the middle pressure and large air quantity,_________ is more suitable.A.an axial flow fanB.a radial flow blowerC.a centrifugal fanD.an auxiliary blower请帮忙给出每个问题的正确答案和分析，谢谢！
考题
Under normal weather and sea conditions when securing a stack of containers with twist locks，lashings are required when the tier exceeds what height?A.Lashings are always requiredB.One containerC.Two containersD.Three containers
考题
Under normal weather and sea conditions when securing a stack of containers with non-locking fittings，lashings are required when the tier exceeds what height ________．A.Lashings are always requiredB.One containerC.Two containersD.Three containers
考题
Due to the large amount of heat picked up by the air in boiler and engine rooms, it would be impracticable to maintain ambient conditions within the comfort zone by air conditioning or any other means. The normal practice is to provide copious mechanical ventilation; in boiler rooms, the quantity is equated to the combustion requirements, while in a motor ship engine room the supply may be 25-50% in excess of the requirements of the engines.The axial flow fan is particularly suited to handle these large air volumes at the moderate pressures required, while of course the “straight-through” flow feature places it at an advantage over the centrifugal fan.The increasing adoption of automation, with the provision of a separate control room makes less significant the fact that comfort conditions cannot be maintained in the engine room all the time. Which of the following devices should be taken to maintain ambient conditions of the boiler and machinery space?A.air compressorB.air coolerC.air-conditioning plantD.mechanical ventilation plant
考题
With reference to the requirements under IMO MODU CODE，Space in which an explosive gas/air mixture is likely to occur in normal operation of Drilling Units is considered as（）.A、Zone0B、Zone1C、Zone2D、Zone3
考题
单选题（） is the circulation and refreshing of the air in a space without necessarily a change of temperature.A
RefrigerationB
Air conditioningC
VentilationD
Heating
考题
单选题Under normal conditions a liferaft is released from itscradle by（）.A
cutting the restraining strapB
unscrewing the turnbuckle on the back of the cradleC
lifting one end of the raftD
pushing the plunger on the center of the hydrostatic release
考题
单选题For the proper control of the air temperature in an air conditioning system using chilled water circulation, which of the listed conditions should remain constant regardless of load changes?（）A
Chilled water system supply temperatureB
Chilled water system return temperatureC
Compressor discharge temperatureD
Compressor suction pressure
考题
单选题Under normal weather and sea conditions when securing a stack of containers with non-locking fittings，lashings are required when the tier exceeds what height?（）.A
Lashings are always requiredB
One containerC
Two containersD
Three containers
考题
单选题Under normal conditions, the main source of crankcase oil contamination is attributed to （）A
metal particles loosened by wearB
air when air cleaners are not usedC
condensation of water vaporsD
breakdown of the lubricating oil by dilution
考题
单选题Which mooring line is likely to undergo the most strain when docking a ship under normal conditions?（）A
Bow lineB
Breast lineC
Spring lineD
Stern line
考题
单选题Air receivers installed in starting air systems are to be （）.A
cylindrical in shape with service connections located at the top and bottomB
opened and made available for inspection during biannual inspections providedC
with automatic drain traps for the removal of moistureD
so installed as to make the drain connections effective under extreme conditions of trim
考题
单选题（） is a precaution which contributes to avoiding trouble under normal operating conditions.A
Constant inspectionB
Keeping constant loadC
Remaining constant temperatureD
Varying speed
考题
单选题Which of the following methods is normally used to control the temperature of air distributed from individual cooling coils in an air conditioning system using a chilled water circulation system?（）A
A room thermostat activates an electric heater at each individual chilled air outlet when necessaryB
Varying the number of passes the air makes across the coilsC
Varying the temperature of the water through the coilsD
Varying the quantity of water flowing through the coils
考题
单选题Under normal conditions, the quantity of air circulation becomes less and less.What is the reason?（）A
dirty delivery ductsB
too much refrigerantC
the fouling filtersD
high temperature outside
考题
单选题Under normal conditions, the refrigerant enters the compressor in an operating refrigeration system as a （）.A
liquidB
dry saturated gasC
wet saturated gasD
superheated vapor
考题
单选题Under normal operating conditions, the rudder is hydraulically locked unless （）.A
the manual trick wheel is engaged for steeringB
the variable stroke pump is off strokeC
a rudder order is given by the control systemD
an electric power system failure occurs at the steering gear
考题
单选题Which of the following conditions can cause above normal air temperature to develop in the intake manifold of a four-stroke/cycle turbo-charged diesel engine?（）A
Clogged air intake faltersB
Piston blow-byC
A defective after-coolerD
Faulty exhaust valves
考题
单选题Under normal operating conditions, the highest temperature and pressure conditions existing in a flash-type evaporator will occur in the （）.A
first stageB
second stageC
distillate coolerD
salt water feed heater
考题
单选题Which of the following conditions can cause below normal air pressure in the intake manifold of a turbocharged diesel engine?（）A
Excessive piston blow-by to the manifoldB
Insufficient cooling water flowC
Accumulated water in the air boxesD
Clogged air intake filters
考题
单选题（） is the control of temperature and humidity in a space together with the circulation, filtering and refreshing of the air.A
RefrigerationB
Air conditioningC
VentilationD
Heating
考题
单选题Under normal weather and sea conditions when securing a stack of containers with twist locks，lashings are required when the tier exceeds what height? （）A
Lashings are always requiredB
One containerC
Two containersD
Three containers
考题
单选题When using a fuel with a higher than normal sulfur content in an auxiliary diesel engine, you should（）A
maintain higher than normal jacket water temperatureB
change the lube oil more frequently than normalC
maintain a higher air-box temperature than normalD
maintain a higher air-box pressure than normal
考题
单选题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
balanceB
not balanceC
be more thanD
be less than
考题
单选题With reference to the requirements under IMO MODU CODE，Space in which an explosive gas/air mixture is likely to occur in normal operation of Drilling Units is considered as（）.A
Zone0B
Zone1C
Zone2D
Zone3
考题
单选题When anchoring a vessel under normal conditions，which scope of chain is recommended? （）A
Four times the depth of waterB
Two and one-half times the depth of waterC
Five to seven times the depth of waterD
Fifteen times the depth of water
热门标签
最新试卷