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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