Mechanical Engineering MCQs

Page No. 87

A backing ring is used inside the pipe joint when making a___________________?


abutt weld


bfillet weld


csleeve weld


dsocket weld


View Answer butt weld

Castle nut is a locking device in which__________________?


aone smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming


ba slot is cut partly is middle of nut and then slot reduced by tightening a screw


ca hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip


dthrough slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin spitted and bent in reverse direction at other end



Gear box is used___________________?


ato produce torque


bfor speed reduction


cto obtain variable speeds


dto increase efficiency of system



The piston rod of a steam engine is usually connected to the cross head by means of__________________?


abolted joint


bkunckle joint


ccotter joint


duniversal joint


View Answer cotter joint

Spring index is___________________?


aratio of coil diameter to wire diameter


bload required to produce unit deflection


cits capability of storing energy


dindication of quality of spring



Form coefficient of spring is _____________________?


aratio of coil diameter to wire diameter


bload required to produce unit deflection


cits capability of storing energy


dconcerned With strength of wire of spring



When two springs are in series (having stiffness K), the equivalent stiffness will be________________?


aK


bK/2


c2K


dKIA


View Answer K/2

If a spring is cut down into two springs, the stiffness of cut springs will be _________________?


ahalf


bsame


cdouble


dunpredictable


View Answer double

Aircraft body is usually fabricated by_________________?


awelding


bprecasting


crivetting


dcasting


View Answer rivetting

In hydrodynamic bearings_____________________?


athe oil film pressure is generated only by the rotation of the journal


bthe oil film is maintained by supplying oil under pressure


cdo not require external supply of lubricant


dgrease is used for lubrication



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