Which pump is the self-priming pump?（）

A . Condenser circulating water pump B . Feed-water heater drain pump C . Distillate pump D . Air ejector condenser drain pum

A . (1) only B . (2) only C . (1) and (2) D . (1),(2)and(3)

A . Correct the cause of the scoring and repair the sleeve or replace with a new one B . Reassemble the unit and provide more water leak off for proper lubrication C . Check for parallel alignment of the sleeve radial faces to the sleeve bores D . Reassemble the unit and adjust the governor to obtain a slower speed

A . In order for a fluid to be pumped, a fluid must be made to flow B . A substance must be cold in order for it to be pumped C . The kinetic energy imparted by the pump can be used to force a liquid through a hydraulic system D . A pump must receive its energy from an external source

A . (1) only B . (2) only C . (1) and (2) D . (1), (2) and (3)

A . one fixed power pump and one portable hand pump B . one fixed hand pump and one portable hand pump C . two portable hand pumps D . either "A" or "B&quot

A . Oil is discharged from the impeller through the outlet B . Gravity causes the oil to flow toward the discharge C . The self-priming feature of the centrifugal pump enables it to draw its own suction as it starts D . The discharge capacity varies directly with the speed of the impeller

A . reciprocating pump B . vane pump C . mono pump D . axial-flow pum

A . top and bottom B . to and fro C . up and down D . back and forth

A . a level controller B . a temperature switch C . a pressure switch D . a floating ball

A . Suction head B . Pump head C . Discharge head D . Total head

A . gears B . rams C . barrels D . cam

A . Surrounding the fixed shaft is a hollow shaft B . This hollow shaft carries radial bores C . Each bore is fitted with a well-lapped plunger D . There are always even numbers of bore

A . They should always be started with the discharge valve closed B . They should always be started with the discharge valve opened C . A priming pump is always required to flood the impeller suction D . They should always be started with the sealing line valves closed

A . They are particularly suited for pumping high viscosity fluids B . They are started with the discharge valve opened C . The flow of liquid is developed by imparting energy due to the rotation of an impeller D . They are always mounted in a horizontal positio

A . No fuel will be delivered B . The maximum effective stroke will be attained C . The fuel delivered to the cylinder will be excessive D . The injection nozzle will overheat and carbonize

A . The pistons reciprocate B . The ‘B’ end cylinder barrel rotates C . There is no fluid flow D . Power is transmitted hydraulically

A . Secure all engine room doors，hatches，and vents B . Close the fuel line valve C . Check the spread of the fire with foam D . Cast the barge off the wharf

A . piston B . drum C . plunger D . barrel

A . a separate motor B . a cam C . a generator D . a chai

A . A power end and fluid end B . A propeller and educator C . A volute and impeller D . A turbine and pisto

A . a service tank B . a collecting tank C . a sump D . a settling tank

A . The wearing rings are excessively worn B . The suction strainer is clogged C . The discharge valve is clogged D . The shaft is wor

A.They are particularly suited for pumping high viscosity fluids B.They are started with the discharge valve opened C.The flow of liquid is developed by imparting energy due to the rotation of an impeller D.They are always mounted in a horizontal position