Mechanical Engineering MCQs

Page No. 93

Machine screws are________________?


asimilar to small size tap bolts except that a greater variety of shapes of heads are available


bslotted for a screw driver and generally used with a nut


cused to prevent relative motion be-tween two parts


dsimilar to stud



A self locking screw has________________>


afine threads


bcoarse threads


ccoefficient of friction > tangent of load angle


dhole for inserting split pin



Which is correct statement ?


aa member made of steel will generally be more rigid than a member of equal load-carrying ability made of cast iron


ba member made of steel will generally be more rigid than a member of equal load-carrying ability made of cast iron


cboth will be equally rigid


dwhich one is rigid will depend on several other factors



The endurance limit in shear of carbon steel can be obtained by multiplying the endurance limit in flexure by a factor of____________?


a0.25


b0.45


c0.55


d0.75


View Answer 0.75

A bolt___________________?


ahas a head on one end and a nut fitted to the other


bhas head at one end and other end fits into a tapped hole in the other part to be joined


chas both the ends threaded


dis provided with pointed threads



If d is the diameter of bolt hole then for a flanged pipe joint to be leak proof, the circumferential pitch of the bolts should be_________________?


alOVZ


b10VZtol5Vd


c15Vdto20VZ


d20Vdto30Vd


View Answer 20Vdto30Vd

The following type of nut is used with alien bolt____________________?


aalien nut


bhexagonal nut


cslotted nut


dany one of the above


View Answer any one of the above

Shear stress theory is applicable for____________________?


aductile fnaterials


bbrittle materials


celastic materials


dall of the above


View Answer ductile fnaterials

For applications involving high stresses in one direction only the following type of thread would be best suited______________________?


aISO metric thread


bacme thread


csquare thread


dbuttress thread


View Answer buttress thread

The function of a washer is to___________________?


aprovide cushioning effect


bprovide bearing area


cabsorb shocks and vibrations


dprovide smooth surface in place of rough surface


View Answer provide bearing area

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