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

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bslotted for a screw driver and generally used with a nut

✓


cused to prevent relative motion be-tween two parts

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dsimilar to stud

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A self locking screw has________________>


afine threads

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bcoarse threads

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ccoefficient of friction > tangent of load angle

✓


dhole for inserting split pin

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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

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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

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dwhich one is rigid will depend on several other factors

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


a0.25

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b0.45

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c0.55

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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

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chas both the ends threaded

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dis provided with pointed threads

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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

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c15Vdto20VZ

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d20Vdto30Vd

✓


View Answer 20Vdto30Vd

The following type of nut is used with alien bolt____________________?


aalien nut

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bhexagonal nut

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cslotted nut

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dany one of the above

✓


View Answer any one of the above

Shear stress theory is applicable for____________________?


aductile fnaterials

✓


bbrittle materials

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celastic materials

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dall of the above

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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

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bacme thread

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csquare thread

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dbuttress thread

✓


View Answer buttress thread

The function of a washer is to___________________?


aprovide cushioning effect

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bprovide bearing area

✓


cabsorb shocks and vibrations

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dprovide smooth surface in place of rough surface

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View Answer provide bearing area

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