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Which of the following types of hydraulic pumps would be used in a steering system?（）
A . Lobe
B . Screw
C . Radial piston
D . Volute
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Cooling water pumps driven by direct reversing diesel engines are usually of the straight impeller vane type pump with a concentric housing to（）
A . facilitate bi-directional operation
B . provide the greatest pump efficiency
C . prevent pump clogging from marine growth
D . prevent cavitation at the pump outlet
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Under rotary pumps are the gear, （）, cam-and-piston and screw types.
A . reciprocating
B . diffuser
C . turbine
D . vane
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One of the main differences between the various types of screw pumps is in the （）.
A . stuffing box diameter
B . direction of rotation of the screws
C . pitch of the screws
D . type of driving gear
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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）
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In an electro-hydraulic steering gear system, when will the variable displacement pump be placed on stroke?（）
A . When the helm is at any angle other than amidships
B . When the six-way valve is opened
C . When the ram relief valves lift
D . When the redder angle is different from the position of the helm
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While overhauling a jerk-type fuel pump it is necessary to replace the pump plungerWhich of the parts listed below must also be replaced?（）
A . Delivery check valve
B . Pump barrel
C . Tubing to the injector
D . Cam follower
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The control rod of a steering gear pump is attached at its outer end to （）.
A . the hunting gear
B . the rudder stock
C . the rudder controller
D . the feedback unit
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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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Movement of the pump control rack in a fuel injection system using individual plunger-type pumps （）
A . changes the position of the fuel inlet ports
B . changes the length of the pump stroke
C . varies the quantity of fuel delivered
D . varies the compression of the delivery valve spring
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The amount of fluid delivered by a gear pump can be regulated by （）.
A . throttling the pressure line
B . changing the speed of the rotor
C . either A or B
D . None of the above is true
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On a lifeboat equipped with Rottmer-type releasing gear，turning the releasing lever releases（）.
A . the painter
B . the after boat fall only if the boat is waterborne
C . both falls at the same time only if the boat is waterborne
D . both falls at the same time even if the boat has not reached the water
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Gear-type flexible couplings are often used in diesel engine drive trains because they（）
A . require no lubrication under normal operating conditions
B . compensate for gross misalignment in the drive train
C . are able to transmit high torque ,even where slight misalignment exists
D . will rapidly disconnect the engine from the line shaft
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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
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A gear pump belongs to （） according to its working principle.
A . reciprocating pumps
B . positive displacement pumps
C . centrifugal pumps
D . centripetal pum
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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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Valve gear knocks are more easily located while the engine （）.
A . is running
B . stops
C . is repaired
D . lacks of oil
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On what type of pump would you find an impeller?（）
A . Centrifugal
B . Gear
C . Piston
D . Vane
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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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When there is no movement of the rams on an electro-hydraulic steering gear, the tilting box of the running pump is （）.
A . set for maximum torque
B . on the purge and vent stroke
C . in the neutral position
D . rotating backward
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A deepwell pump is a type of（）.
A . screw pump
B . centrifugal pump
C . eductor
D . gear pum
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The majority of cargo gear breakdowns are a result of（）.
A . Guy failures
B . Topping lift failures
C . Bending of the boom from compression
D . Gooseneck failure
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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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Which of the devices listed is common to all types of pumps?（）
A . A power end and fluid end
B . A propeller and educator
C . A volute and impeller
D . A turbine and pisto
