海船船员考试
单选题Gear pumps are （） because they discharge a near constant amount of liquid regardless of pressure.A negative displacement typeB turbine typeC positive displacement typeD mixed-flow type
题目
negative displacement type
turbine type
positive displacement type
mixed-flow type
参考答案和解析
相似问题和答案
第1题：
A spur gear pump should be operated with the discharge valves ______.
A.slightly opened
B.throttled
C.fully opened
D.halfway opened
第2题：
Absorb erosion of high velocity discharge stream
Seal pump shaft against entry of air
Isolate the outlet side from the inlet side
Dampen the turbulent discharge flow
第3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 pumps
B.it is not necessary to closely maintain design clearances with this pump
C.they are essentially self-priming and produce a high suction lift
D.these pumps are designed with extreme tooth angles
第4题：
The high discharge pressure of the rotary pumps permits a larger volume of fluid per unit time than the reciprocating pump
Rotary pumps are capable of pumping more fluid than reciprocating pumps of the same weight
Rotary pumps occupy only one-half the space of reciprocating pumps
Rotary pumps eliminate discharge slippage of the pumped liquid, while this does not hold true for a reciprocating pump
第5题：
Absorb erosion of high velocity discharge stream
Seal pump shaft against entry of air
Isolate the discharge side from the suction side
Dampen the turbulent discharge flow
第6题：
What is the function of wearing rings found on some centrifugal pumps ________．
A.Absorb erosion of high velocity discharge stream
B.Seal pump shaft against entry of air
C.Isolate the outlet side from the inlet side
D.Dampen the turbulent discharge flow
第7题：
reciprocating pumps
positive displacement pumps
centrifugal pumps
centripetal pumps
第8题：
Gear pumps are widely used to transfer any one of the following but .
A.fuel oil
B.lube oil
C.hydraulic oil
D.fresh water
第9题：
depending on
in relative to
regardless of
because of
第10题：
variable stroke pumps
multistage pumps
positive displacement pumps
triple-ported pumps