Each crank is made up of two crank webs joined by a common（） to which the bottom endbearing is fitted.

[单选题]What is the crank angle between any two crank throws in the firing order of a four-stroke/cycle, in line, eight cylinder diesel engine?（）A . 45B . 60C . 90D . 100

[单选题]With the crank in position in the engine, some measurements can be taken by a special bridge gauge and （）.A . a micrometerB . a bowlC . a feeler gaugeD . a wrench

[单选题]The crank chamber oil （）.A . can be recoveredB . is only supplied to cylindersC . only feeds the main bearingD . is a kind of detergent

[单选题]Lubricating oil is supplied to the crank-pin bearings in a marine diesel engine by （）.A . internal crankshaft passagesB . immersion in oilC . splash lubricationD . injection lubricatio

[单选题]Operating conditions in the crank chamber are very （） those in the cylinder.A . the same asB . similar toC . separated fromD . different from

[单选题]Crank web deflection readings will give a positive indication of （）.A . worn main bearing journalsB . torsional stress deformationC . slack thrust bearingsD . bearing shells shim dimensio

[单选题]The diameter of the crank-pins should be measured with a （）.A . salinometerB . thermometerC . tachometerD . micrometer

[单选题]The crank pin journal is provided with large bores for （）.A . lubricationB . coolingC . balancing purposeD . ventilatio

[单选题]（） clearances in the main or crank pin bearings will sometimes be indicated by loss of pressure in the lubricating system before any bearing knock is heard.A . Too largerB . Too smallerC . ExcessD . Excessive

[单选题]The crank-room cover should not be opened until at least （） minutes after the engine stops.A . oneB . fifteenC . sixtyD . ninety