Mechanical Engineering MCQs

Page No. 133

The C.G. of a plane lamina will not be at its geometrical centre in the case of a __________________?


aright angled triangle

✓


bequilateral triangle

✖


csquare

✖


dcircle

✖


View Answer right angled triangle

A sample of metal weighs 219 gms in air, 180 gms in water, 120 gms in an unknown fluid. Then which is correct statement about density of metal__________________?


adensity of metal can’t be determined

✓


bmetal is twice as dense as water

✖


cmetal will float in water

✖


dmetal is twice as dense as unknown fluid

✖



The co-efficient of friction depends upon _________________?


anature of surfaces

✓


barea of contact

✖


cshape of the surfaces

✖


dail of the above.

✖


View Answer nature of surfaces

The algebraic sum of moments of the forces forming couple about any point in their plane is__________________?


aequal to the moment of the couple

✓


bconstant

✖


cboth of above are correct

✖


dboth of above are wrong

✖



In a belt drive, the pulley diameter is doubled, the belt tension and pulley width remaining same. The changes required in key will be____________________?


aincrease key length

✖


bincrease key depth

✖


cincrease key width

✓


ddouble all the dimensions

✖


View Answer increase key width

The value of shear stress which is induced in the shaft due to the applied couple varies____________________?


afrom maximum at the center to zero at the circumference

✖


bfrom zero at the center to maximum at the circumference

✓


cfrom maximum at the center to mini-mum at the cricumference

✖


dfrom minimum at the centro to maxi-mum at the circumference

✖



The safe twisting moment for a compound shaft is equal to the _________________?


amaximum calculated value

✖


bminimum calculated value

✓


cmean value

✖


dextreme value

✖



A cylindrical section having no joint is known as ____________________?


ajointless section

✖


bhomogeneous section

✖


cperfect section

✖


dseamless section

✓


View Answer seamless section

The force acting along the circumference will cause stress in the walls in a direction normal to the longitudinal axis of cylinder; this stress is called___________________?


alongitudinal stress

✖


bhoop stress

✓


cyeiled stress

✖


dultimate stress

✖


View Answer hoop stress

The weakest section of a diamond riveting is the section which passes through ___________________?


athe first row

✖


bthe second row

✖


cthe central row

✖


done rivet hole of the end row

✓



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