更多"Which of the following pumps is mos"的相关试题:
[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]Which of the following types of hydraulic pumps would be used in a steering system?（）
A. Lobe
B. Screw
C. Radial piston
D. Volute
[单项选择]Which of the following pumps belongs to centrifugal pump?（）
A. Piston pump
B. Screw pump
C. Diffuser pump
D. Water-ring pump
[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]Which of the following pumps is used where a relatively high pressure and small capacity are required?（）
A. Volute pump
B. Diffuser pump
C. Regenerative pump
D. All of the above
[单项选择]
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) screw
A. （1）and（2）
B. （1），（2）and（3）
C. （1）and（3）
D. （2）and（3）
[单项选择]Which of the following is suitable for bagged cargo?（）.
A. hydraulically operated pusher
B. spread beam sling
C. revolving roll clamping device
D. platform sling
[单项选择]
Which of the following pumps are self-priming, and can deal with liquid from a level below the pump? （）
(1) reciprocating
(2) rotary
(3) centrifugal
A. (1)only
B. (1)and (2)
C. (1),(2)and(3)
D. (2)and(3)
[单项选择]Which of the following is more suitable for bagged cargo?（）.
A. Hydraulically operated pusher
B. Spread beam sling
C. Revolving roll clamping device
D. Platform sling
[单项选择]Which of the following conditions is most likely to occur when unburned fuel contaminates the crankcase of a diesel engine?（）
A. Lube oil is diluted and its viscosity is reduced
B. Sulfuric acid is formed
C. Bearings become pitted ad immediately fail
D. Valve stems develop sludge deposits
[单项选择]As to the bearing, of the following, which statement is not true?（）
A. ff overheat is found, the engine must be stopped for inspection
B. Much heat of the crankcase door indicates that the bearing is overheated
C. If bearing clearance is too large, knocking will be heard in the crankcase
D. If bearing clearance is too large or too small, the white metal may be melted
[单项选择]As to the piston cooling, of the following, which statement is not true?（）
A. Because the piston is exposed to very high temperature, it must be cooled
B. The lower the piston cooling temperature is, the better it is
C. Both water and lube oil can be used as coolant
D. One of the piston cooling methods is vibration cooling, with better effect
[单项选择]Which will most likely occur when entering shallow water? （）
A. Rudder action will become more effective
B. The vessel's list will change
C. The vessel's trim will change
D. An increase in speed will occur
[单项选择]The valve which is most suited for regulating the flow through a pipeline is a （）
A. gate valve
B. globe valve
C. swing-check valve
D. plug-cock valve
