A crankshaft whose center of gravity coincides with its center line is said to be （）.

[单选题]If the vertical center of gravity (VCG) of a ship rises 1.7 feet，the righting arm (GZ) for the various angles of inclination will（）.A . decreaseB . increaseC . remain unchangedD . be changed by the amount of GG' x cosine of the angle

[单选题]What is the speed of the crankshaft in a four-stroke/cycle engine when the camshaft is turning at 750 rpm?（）A . 375 RPMB . 500 RPMC . 750 RPMD . 1500 RPM

[单选题]The crankshaft deflection is at first to be （） before and after repair.A . disassembledB . renewedC . measuredD . regulated

[单选题]F．or a purifier changing to a gravity disc with smaller hole diameter will move the interface towards the _______.A．bowl peripheryB．bowl centerC．upper surfaceD．lower surface

[单选题]It can be interred that without gravity .A．buildings and other structures would float awayB．trees and buildings would not so easily fly offC．something around your head would not float awayD．everything outside buildings would fly off into space

[单选题]The diameter of the gravity disc is too big It causes oil to flow through the water outlet We changed the disc and no （） is found in the water outlet.A . waterB . oilC . scaleD . ridge

[单选题]In a purifier changing to a gravity disc with larger hole diameter will move the interface towards the （）.A . bowl peripheryB . bowl centerC . upper surfaceD . lower surface

[单选题]（） of an engine crankshaft can be detected by measuring deflections of crank webs for each unit of the engine.A . MisalignmentB . LengthC . StrengthD . Stresse

[单选题]When a crankshaft （） outside the engine, it should be carefully supported in a manner which will avoid imposing high bending moments on it.A . has to be handledB . may be handledC . has being handledD . will be handling

[单选题]The crankshaft of diesel engine is supported by （）.A . tension stretchB . tie rodsC . through boltsD . main bearing