Under rotary pumps are the gear, （）, cam-and-piston and screw types.
A . reciprocating
B . diffuser
C . turbine
D . vane
相似题目
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Problems with the diesel engine fuel injection pump are usually caused by（）
A . improper adjustment
B . contaminated fuel
C . kinked fuel lines
D . excessive engine vibratio
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The various pumps and lines are （） to some extent so that each pump can act as an alternative for another.
A . interlocked
B . interconnected
C . interfered
D . interacted
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All of the following are distress signals under the Rules EXCEPT（）.
A . International Code Signal "AA"
B . orange-colored smoke
C . red flares
D . the repeated raising and lowering of outstretched arm
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Which statements are true regarding the Oracle Data Pump export and import operations（）
A . You cannot export data from a remote database.
B . You can rename tables during an import operation.
C . You can overwrite existing dump files during an export operation.
D . You can compress the data during export but not the metadata because it is not supported
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Which of the following statements represents the advantage of rotary pumps as compared to reciprocating pumps?（）
A . The high discharge pressure of the rotary pumps permits a larger volume of fluid per unit time than the reciprocating pump
B . Rotary pumps are capable of pumping more fluid than reciprocating pumps of the same weight
C . Rotary pumps occupy only one-half the space of reciprocating pumps
D . Rotary pumps eliminate discharge slippage of the pumped liquid, while this does not hold true for a reciprocating pum
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The fuel injection pumps on a diesel engine are controlled by a linkage system attached to the （）
A . camshaft
B . crankshaft
C . governor
D . flywheel
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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)
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Operating a rotary pump at speeds in excess of design requirements could cause（）.
A . decreased clearances between rotating parts
B . decreased slippage to the suction side of the pump
C . air binding in the discharge ports
D . erosion and excessive wear
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Under centrifugal pumps are the volute, diffuser, mixed-flow, axial flow and （） or regenerative types.
A . reciprocating
B . hydraulic
C . turbine
D . vane
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Increasing the speed of a rotary pump above its rated speed will result in which of the following conditions to occur?（）
A . Loss of suction
B . Increased clearances
C . Decreased clearance
D . Decreased slippage
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Hydraulic pumps most commonly used in steering systems are of the （）.
A . lobe type
B . screw type
C . axial piston type
D . volute type
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The ports are drilled in the liners at an angle of approx 20℃ the result being that （） is given a rotary movement.
A . the scavenging air
B . the exhaust gases
C . the mixed air
D . the spray oil
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The gear and screw pumps are classified as （）.
A . variable stroke pumps
B . multistage pumps
C . positive displacement pumps
D . triple-ported pum
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All of the following are recognized distress signals under the Navigation Rules EXCEPT（）.
A . a green star signal
B . orange-colored smoke
C . red flares
D . the repeated raising and lowering of outstretched arm
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Cargo pump relief valves are piped to the（）.
A . cargo pump pressure gauges
B . crossover lines interconnecting two pumps
C . suction side of pumps
D . atmosphere through pump vent
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The gear, screw, and vane pumps are all classified as （）.
A . variable stroke pumps
B . multistage pumps
C . positive displacement pumps
D . triple-ported pum
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All of the followings are the detainable deficiencies under the SOLAS Convention expert（）.
A . Failure of proper operation of propulsion and other essential machinery, as well as electrical installation
B . Failure of the proper operation of the main and auxiliary steering gear
C . Failure of engineering watch arrangements to confirm to the requirements specified for the ship by Administration
D . Failure of the proper operation of emergency generator, lighting, batteries and switche
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Which of the following pumps are self-priming, and can deal with liquid from a level below the pump（） (1) ejector (2) screw (3) centrifugal
A . (1)only
B . (1)and(2)
C . (1),(2)and(3)
D . (2)and(3)
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Which of the following pumps are self-priming, and can deal with liquid from a level below the pump? （） (1) reciprocating (2) vane (3) gear
A . （1）only
B . （1）and（2）
C . （1），（2）and（3）
D . （2）and（3）
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There are ______maxims under the cooperative principle.
A．2
B．3
C．5
D．4
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The ports are drilled in the liners at an angle of approx20℃ the result being that _____ is given a rotary movement.
A.the scavenging air
B.the exhaust gases
C.the mixed air
D.the spray oil
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Dynamic pumps are classified as centrifugal or axial. axial pumps operate on the principle of centrifugal force.（）
是
否
