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 rotary pumps are the gear, （）, cam-and-piston and screw types.
A
reciprocating
B
diffuser
C
turbine
D
vane
参考答案
参考解析
解析：
暂无解析
更多 “单选题Under rotary pumps are the gear, （）, cam-and-piston and screw types.A reciprocatingB diffuserC turbineD vane” 相关考题
考题
Gear pumps are widely used to transfer any one of the following but .A.fuel oilB.lube oilC.hydraulic oilD.fresh water
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
In case of your steering gear failed,________should be exhibited in shapes or lights.A.no under commandB.restricted in her abilityC.restrained by her draughtD.underway
考题
The Certificate of Inspection for a containership ______.A.is issued by the Coast Guard and is usually valid for 2 yearsB.must be posted under transparent material near the officers' licensesC.lists all of the stability limitations and conditions imposed on the vesselD.shows the due date of the quadrennial test of the cargo gear
考题
Dual electro-hydraulic steering units usually operate ______．A.With both pumps on line at the same timeB.With one pump on standbyC.With the follow-up gear disconnectedD.Only when the rudder is moved amidships
考题
When the helm is turned on the navigation bridge，which of the listed actions will be the FIRST response in the steering room on a ship equipped with an electro-hydraulic steering gear ________．A.The pumps go to full strokeB.The six-way valve aligns itself with the running pumpC.Both port and starboard cables are energizedD.The synchronous receiver turns，duplicating the helm motion
考题
In case of your steering gear failed, ______ should be exhibited in shapes or lights.A.not under commandB.restricted in her ability to manoeuverC.restrained by her draughtD.Underway
考题
单选题A gear pump belongs to （） according to its working principle.A
reciprocating pumpsB
positive displacement pumpsC
centrifugal pumpsD
centripetal pumps
考题
单选题Gear pumps are of positive displacement type pumps because they discharge a near constant amount of liquid （） pressure.A
depending onB
in relative toC
regardless ofD
because of
考题
单选题With reference to a rotary vane steering gear system, which one of the following statements is true?（）A
The three moving vanes and the three fixed vanes form three pressure chambersB
The three moving vanes and the three fixed vanes form six pressure chambersC
The three moving vanes and the three fixed vanes form nine pressure chambersD
The three moving vanes and the three fixed vanes form twelve pressure chambers
考题
单选题In case of your steering gear failed,（）should be exhibited in shapes or lights.A
not under commandB
restricted in her abilityC
restrained by her draughtD
underway
考题
单选题Which of the following statements represents the advantage of rotary pumps as compared to reciprocating pumps?（）A
The high discharge pressure of the rotary pumps permits a larger volume of fluid per unit time than the reciprocating pumpB
Rotary pumps are capable of pumping more fluid than reciprocating pumps of the same weightC
Rotary pumps occupy only one-half the space of reciprocating pumpsD
Rotary pumps eliminate discharge slippage of the pumped liquid, while this does not hold true for a reciprocating pump
考题
单选题Which of the following pumps are self-priming, and can deal with liquid from a level below the pump? （） (1) reciprocating (2) rotary (3) centrifugalA
（1）onlyB
（1）and（2）C
（1），（2）and（3）D
（2）and（3）
考题
单选题The gear, screw, and vane pumps are all classified as （）.A
variable stroke pumpsB
multistage pumpsC
positive displacement pumpsD
triple-ported pumps
考题
单选题Positive displacement, helical gear pumps are well suited for pumping oil because （）A
stuffing boxes eliminate the leakage problems usually associated with other gear pumpsB
it is not necessary to closely maintain design clearances with this pumpC
they are essentially self-priming and produce a high suction liftD
these pumps are designed with extreme tooth angled
考题
单选题Which of the following pumps will build up a bursting pressure or stall their motors if the discharge valves are closed?（） (1) gear (2) centrifugal (3) screwA
（1）and（2）B
（1），（2）and（3）C
（1）and（3）D
（2）and（3）
考题
单选题Under centrifugal pumps are the volute, diffuser, mixed-flow, axial flow and （） or regenerative types.A
reciprocatingB
hydraulicC
turbineD
vane
考题
单选题Dual electro-hydraulic steering units usually operate （）.A
with both pumps on line at the same timeB
with one pump on standbyC
with the follow-up gear disconnectedD
only when the rudder is moved amidships
考题
单选题In case of your steering gear failed，（）should be exhibited in shapes or lights.A
not under commandB
restricted in her ability to manoeuvreC
restrained by her draughtD
underway
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Gear pumps are （） type because they discharge a near constant amount of liquid regardless of pressure.A
positive displacementB
non-positive displacementC
mixed-flowD
axial-flow
考题
单选题The Certificate of Inspection for a containership （）.A
is issued by the Coast Guard and is usually valid for 2 yearsB
must be posted under transparent material near the officers' licensesC
lists all of the stability limitations and conditions imposed on the vesselD
shows the due date of the quadrennial test of the cargo gear
考题
单选题Which of the following statements is/are true regarding hydraulic pumps in general? （）A
Variable volumes can be obtained with gear pumps only by variation of the pump drive speedB
A radial piston pump houses sliding pistons in a stationary cylinder block through which passes a rotating pintle or ported shaftC
The amount of fluid displaced per revolution of an axial piston rotary pump is dependent on the angle formed between the cylinder block and valve plateD
All of the above
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On a vessel making a voyage more than 48 hours long，regulations require that（）.A
a lifeboat drill be held within 12 hours prior to departureB
fire pumps be tested by starting within 12 hours prior to departureC
the emergency generator and lighting system be tested by starting and operating within 12 hours prior to departureD
the entire steering gear be tested within 12 hours prior to departure
考题
单选题The gear and screw pumps are classified as （）.A
variable stroke pumpsB
multistage pumpsC
positive displacement pumpsD
triple-ported pumps
考题
单选题The responsibilities of the engineer officer in charge of the watch do not include （）A
to ensure the main propulsion plant are kept under constant surveillanceB
to ensure the auxiliary systems are kept under constant surveillanceC
to inspect the steering gear spaces at suitable intervalsD
to inspect and overhaul the equipments in his charge
热门标签
最新试卷