in series
in parallel
assembled
together
第1题:
第2题:
interlocked
interconnected
interfered
interacted
第3题:
If a centrifugal pump is driven by a constant speed electric motor and produces a discharge pressure less than designed, the cause is probably ______.
A.excessive pump speed
B.excessive suction head
C.worn wearing rings
D.gross pump misalignment
第4题:
stuffing boxes eliminate the leakage problems usually associated with other gear pumps
it is not necessary to closely maintain design clearances with this pump
they are essentially self-priming and produce a high suction lift
these pumps are designed with extreme tooth angled
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:
第7题:
the mechanical seal
packed stuffing boxes
either A or B
neither A nor B
第8题:
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
第9题:
gear
nonpositive displacement
positive displacement
rotary
第10题:
Classification Society Rules
National requirements
The IMO International Convention for the Safety of Life at Sea
All of the above