A screw pump belongs to （） according to its working principle.
When start a screw pump, the by pass valve should be （）.
In a （） the center screw is driven and the outer screws idle.
Under rotary pumps are the gear, （）, cam-and-piston and screw types.
One of the main differences between the various types of screw pumps is in the （）.
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
Pitting in the area close to the pitch line and on the same end of each gear tooth of a reduction gear unit would be caused by （）
Which features of a centrifugal pump reduce the need for renewing worn impellers and pump casings?（）
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
Large marine diesel engines of crosshead construction generally have two systems of lubrication: a total loss system feeding the （） and a recirculation system lubricating the running gear and cooling the piston.
You are landing a single-screw vessel，with a right-hand propeller，starboard side to the dock.When you have approached the berth and back the engine，you would expect the vessel to （）.
The amount of fluid delivered by a screw pump can be regulated by （）.
The control rod of a steering gear pump is attached at its outer end to （）.
（）diesel engines generally have two systems of lubrication:（）a total loss system feeding and a circulating system lubricating the running gear and cooling the pistons.
The amount of fluid delivered by a gear pump can be regulated by （）.
A gear pump belongs to （） according to its working principle.
Some medium and high-speed diesel engines require reduction gear units to provide a useful propeller speedIn most reduction gears, the bull gear（）
The gear, screw, and vane pumps are all classified as （）.
There is a （） system lubricating the running gear and cooling the piston and sometimes lubricating the cylinders.
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
To center a compass bowl in its binnacle，you should have the ship on an even keel，heading north or south，and adjust the screws until（）.
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
The injector pump is operated by a cam which drives the （） up and down.
Your vessel is taking on fuel oil when a small leak develops in the hose and you have ordered the pumping stoppedBefore resuming pumping，you should（）.
