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
A gear pump belongs to （） according to its working principle.
A
reciprocating pumps
B
positive displacement pumps
C
centrifugal pumps
D
centripetal pumps
参考答案
参考解析
解析：
暂无解析
更多 “单选题A gear pump belongs to （） according to its working principle.A reciprocating pumpsB positive displacement pumpsC centrifugal pumpsD centripetal pumps” 相关考题
考题
Which statement is NOT true?A.While displacement pump works, volume of the working chamber will increase and decrease alternatelyB.A gear pump always has two gearsC.Any vane pump will have a rotor within a ringD.A balanced vane pump has two outlet ports and they are positioned symmetrically
考题
Which statement is NOT true?A.In a simple vane pump, the rotor and cam ring are exactly concentricB.Balanced vane pump has an elliptical cam ringC.Liquid in both gear pump and vane pump are forced out to the outlet.D.Balanced vane pumps can work at a higher pressure than the simple vane pump
考题
A spur gear pump should be operated with the discharge valves ______.A.slightly openedB.throttledC.fully openedD.halfway opened
考题
The safe working load for the assembled cargo gear and the minimum angle to the horizontal for which the gear is designed shall be marked on the ______．A.deckB.head of the boomC.heel of the boomD.mast or king post
考题
In relation to cargo gear, what does SWL mean ?______.A.Safe working loadB.Ship’s working liftC.Starboard wing liftD.Stress, weight, load
考题
单选题When the desired rudder angle is attained by a typical double mm electro-hydraulic steering gear,the（）.A
ram relief valves bypass oil to stop rudder movementB
six-way valve shifts to the neutral flow positionC
steering pump electric motor is de - energized by the transfer switchD
follow-up gear takes the hydraulic pump off stroke
考题
单选题When the helm demands a 20°right rudder movement from an electro-hydraulic steering gear, which of the listed actions will be the FIRST action to happen when this rudder position is attained?（）A
The six-way valve opensB
The steering service pump motor is stoppedC
The follow-up gear takes the pump off strokeD
The cylinder relief valves bypass oil to the suction side the pump
考题
单选题“The use of a poor quality oil can lead to rapid deterioration of its properties with the resultant formation of deposits in the piston crown which in turn results in a considerable reduction in heat transfer with subsequent overheating and thermal cracking” According to this sentence, we can know that the principle reason of the overheating and thermal cracking is（）A
the use of a poor quality oilB
the deterioration of its propertiesC
the formation of depositsD
the reduction in heat transfer ability
考题
单选题A screw pump belongs to （） according to its working principle.A
reciprocating pumpsB
positive displacement pumpsC
centrifugal pumpsD
centripetal pumps
考题
单选题In relation to cargo gear,what does SWL mean?（）.A
Safe working loadB
Ships working liftC
Starboard wing liftD
Stress , weight , load
考题
单选题In relation to cargo gear，what does SWL mean?（）.A
Safe working loadB
Ship's working liftC
Starboard wing liftD
Stress，weight，load
考题
单选题An advantage of a helical gear pump over a simple gear pump is that the helical gear pump is capable of （）.A
maintaining a steadier speedB
delivering liquids over greater distancesC
operating for longer periods of timeD
producing a smoother discharge flow
考题
单选题According to the way the steering gear is operated, the steering gear may be divided into: hand - steering, （） and automatic steering.A
hydraulic steeringB
follow-up steeringC
remote control steeringD
air controlled steering
考题
填空题According to the principle of state equality, each state is represented by two Senators in the Senate.____
考题
单选题The control rod of a steering gear pump is attached at its outer end to （）.A
the hunting gearB
the rudder stockC
the rudder controllerD
the feedback unit
考题
单选题A mixed-flow pump is a （） pump classified by the working principle.A
self primingB
positive displacementC
reciprocatingD
impeller
考题
单选题（）belongs to emergency power supplying equipments.A
Emergency fire pumpB
WindlassC
Main sea water pumpD
Fresh water pump
考题
单选题The amount of fluid delivered by a gear pump can be regulated by （）.A
throttling the pressure lineB
changing the speed of the rotorC
either A or BD
None of the above is true
考题
单选题The follow-up gear on an electro-hydraulic steering gear（）A
relieves excessive fluid pressureB
takes the pump off stroke when the desired rudder angle is attainedC
synchronizes wheel position with the rudder positionD
returns the rudder to midposition when the wheel is released
考题
单选题According to the principle of two stroke diesel engine, what is the number of its efficient work stroke per revolution?（）A
1/2B
1C
2D
3
考题
单选题Which of the following pumps belongs to centrifugal pump?（）A
Piston pumpB
Screw pumpC
Diffuser pumpD
Water-ring pump
考题
单选题According to regulations，a cargo hose used for transferring liquefied gases must have a bursting pressure of（）.A
5 times the maximum working pressure on the hose during cargo transferB
one half the designed working pressureC
4 times the pressure of the cargo pump used for transferringD
5 times the minimum working pressure on the hose during cargo transfer
考题
单选题The safe working load for the assembled cargo gear and the minimum angle to the horizontal for which the gear is designed shall be marked on the（）.A
deckB
head of the boomC
heel of the boomD
mast or king post
考题
单选题With reference to operating a four-ram steering gear system under emergency conditions, which one of the following statements is incorrect?（）A
Only one pump should be used at any timeB
The ship speed should be reduced to 70% of the normalC
Watch keeping of the steering gear should be increasedD
Limitations of the steering gear should be logged but the bridge need not be informed
考题
单选题A vane pump belongs to （） according to its working principle.A
reciprocating pumpB
positive displacement pumpC
centrifugal pumpD
centripetal pump
考题
单选题A spur gear pump should be operated with the discharge valves （）.A
slightly openedB
throttledC
fully openedD
halfway opened
热门标签
最新试卷