Sealing in pump shaft is achieved by m

1、The volute pump is one in which the im

The volute pump is one in which the impeller （）.Adischarges into a gradually widening channelBhas stationary diffuser vanesCproduces no kinetic energyDAll of the above are true

2、Clean oil is achieved in a clarifier b

Clean oil is achieved in a clarifier bowl where the impurities and water collect at the bowl （）.AbottomBtopCcenterDperiphery

3、The injector pump is operated by a cam

The injector pump is operated by a cam which drives （） up and down.Athe needle valveBthe plungerCthe pistonDthe cylinder

4、Cooling of engine is achieved by circu

Cooling of engine is achieved by circulation a cooling liquid around internal passages within the （）.AboilerBheaterCengineDcooler

5、The injector pump is operated by a cam

The injector pump is operated by a cam which drives the plunger （）.Atop and bottomBto and froCup and downDback and forth

6、Shaft sealing in a centrifugal pump ca

Shaft sealing in a centrifugal pump can be effected by （）.Athe mechanical sealBpacked stuffing boxesCeither A or BDneither A nor B