更多"Which of the following pumps are se"的相关试题:
[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]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 pumps is most suitable for an oily water separator?()
A. reciprocating pump
B. vane pump
C. mono pump
D. axial-flow pump
[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 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 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 listed pumps is NOT a positive displacement pump?()
A. Centrifugal
B. Reciprocating
C. Gear
D. Rotary
[单项选择]Which of the following is not a factor which can interfere with the pulse of sound and cause a variation the depth reading?()
A. salinity
B. temperature
C. the hydrostatic pressure
D. Vessel’s speed
[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 of the following statements about transmitting distress messages by radiotelephone is INCORRECT?()
A. If no answer is received on the designated distress frequencies,repeat the distress call on any frequency available
B. Channel 16 (156.8) may be used for distress messages
C. It is advisable to follow a distress message on 2182 kHz by two dashes of 10 to 15 seconds duration
D. Distress messages should first be transmitted on 2182 kHz
[单项选择]Which of the following statements concerning cargo is correct?()
A. Cargoes are any type of goods transported by any type of ships
B. Cargoes are goods transported in bulk
C. Cargoes usually include goods transported in bulk and in containers
D. Cargoes are usually packaged in containers
[单项选择]Which of the following statements concerning frontal movements is TRUE().
A. The temperature rises after a cold front passes
B. The barometric pressure rises when a warm front passes
C. A cold front generally passes faster than a warm front
D. A warm front usually has more violent weather associated with it than a cold front