更多"Cooling water pumps driven by direc"的相关试题:
[单项选择]For a propeller direct driven by the engine,（）.
A. the thrust pads are while metal faced on both sides
B. the thrust pads are while metal faced only on the forward side
C. the thrust pads are while metal faced only on the after side
D. intermediate shaft usually supported by a plummer block
[单项选择]The cooling water is in direct contact with the outer surface of the liner as a result of which it is termed a （）.
A. water liner
B. wet liner
C. dry liner
D. drown liner
[单项选择]Gear pumps are of positive displacement type pumps because they discharge a near constant amount of liquid （） pressure.
A. depending on
B. in relative to
C. regardless of
D. because of
[单项选择]When distilling salt water the cooling water discharging from the distiller is fed back to evaporator as feed water （）.
A. to cut down the amount of cooling water needed
B. to prevent an excess amount of cooling water from being discharged to the bilges
C. to supply hot water to the evaporator for more economical operation
D. None of the above is tree
[单项选择]When distilling sea water the cooling water discharging from the distiller is fed back to evaporator as feed water （）.
A. to decrease scale formation
B. for better cooling effect
C. for more economical purpose
D. to raise vacuum
[单项选择]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 angled
[单项选择]Hydraulic pumps most commonly used in steering systems are of the （）.
A. lobe type
B. screw type
C. axial piston type
D. volute type
[单项选择]Overgreasing of ball bearings installed on pumps will result in （）.
A. smoother pump operation
B. overheating of the bearing
C. reduced corrosion in the bearing
D. increased pump capacity
[单项选择]Regulations require that cargo pumps in tankers carrying grade D liquid cargo shall be isolatedfrom sources of vapor ignition by（）.
A. cofferdams
B. gastight bulkheads
C. passageways or living quarters
D. general cargo spaces
[单项选择]Which of the following pumps belongs to centrifugal pump?（）
A. Reciprocating pump
B. Screw pump
C. Diffuser pump
D. Water-ring pump
[单项选择]An electrically driven automatically operating auxiliary blower is provided for slow speed and （） of a low speed diesel engine.
A. manoeuvring operations
B. bad combustion
C. cooling
D. mooring trial
[单项选择]A water pump can not supply water after startingIt may be caused by （）.
A. closed discharge valve
B. broken pipe line
C. worn shaft
D. both A and B
[单项选择]After stopping oily water separator, sea water should be permitted for （） minutes,（）should be closed after stopping pump to reduce oxidation corrosion of inner wall.
A. 15；inlet value
B. 15；inlet and outlet value
C. 30；inlet value
D. 30；inlet and outlet value
[单项选择]When fire pumps are used for other than firefighting service，each pipe connecting the other service (except for branch lines used for deck washing) must have a（）.
A. check valve installed in the line
B. shut off valve at a manifold near the pump
C. quick disconnect union within ten feet of the pump
D. regulator in the line set at 125 psi
[单项选择]Multiple fire pumps may be used for other purposes provided that one pump is（）.
A. on line to the fire main
B. kept available for use on the fire main at all times
C. capable of being connected to the fire main
D. rated at or above 125 psi
[单项选择]Under centrifugal pumps are the volute, diffuser, mixed-flow, axial flow and （） or regenerative types.
A. reciprocating
B. hydraulic
C. turbine
D. vane
[单项选择]Which of the following pumps will most affect oily water separator performance and give the worst result?（）
A. reciprocating pump
B. vane pump
C. screw pump
D. centrifugal pump
[单项选择]Some pumps use packing as sealing glandThe gland should be （）.
A. slack enough to allow slight leakage of fluid
B. slightly clocked
C. brought up tight so as not to allow any leakage
D. fitted with a relief valve
[单项选择]The minimum number and capacity of bilge pumps and fire pumps and their distributing within the ship is governed by （）.
A. Classification Society Rules
B. National requirements
C. The IMO International Convention for the Safety of Life at Sea
D. All of the above
