海船船员
Centrifugal pumps have what advantage（s）over reciprocating pumps ________．A.They are less expensiveB.They are smaller for equivalent pumping abilityC.They pump more cargo in less timeD.All of the above
题目
Centrifugal pumps have what advantage（s）over reciprocating pumps ________．
A.They are less expensive
B.They are smaller for equivalent pumping ability
C.They pump more cargo in less time
D.All of the above
相似问题和答案
第1题：
What is an advantage of a gate valve over a butterfly valve ________．
A.Less frequent maintenance
B.Faster operation
C.Cheaper
D.More compact
第2题：
operated manually once an hour
operated until the engine has started
placed into operation only at maximum load
adjustable to meet lubrication requirements
第3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4题：
gear
nonpositive displacement
positive displacement
rotary
第5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6题：
What is an advantage of diesel over steam turbine propulsion ________．
A.Less fuel consumption per SHP
B.Diesel fuel costs less than bunker C or its equivalent
C.Less routine maintenance required
D.Less weight per SHP
第7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8题：
What is a requirement for remote manual shutdown stations for internal combustion engine driven cargo pumps on tank barges ________．
A.They must be conspicuously marked
B.They must be located at least 10 feet from the engine
C.There must be at least two such shutdown devices
D.The valve rods shall be fitted with stuffing boxes
第9题：
（1）only
（1）and（2）
（1），（2）and（3）
（2）and（3）
第10题：
increase discharge pressure
increase suction vacuum
develop pulsation flow
keep a steady rate of flow