Mechanical Engineering MCQs

Page No. 132

Rivets are made of following type of material_________________?


atough


bhard


cresilient


dductile


View Answer ductile

A boiler shell 200 cm diameter and plate thickness 1.5 cm is subjected to internal pressure of 1.5 MN/m , then the hoop stress will be_________________?


a30 MN/m2


b50 MN/m2


c100 MN/m2


d200 MN/m2


View Answer 100 MN/m2

Longitudinal stress in a thin cylinder is__________________?


aequal to the hoop stress


btwice the hoop stress


chalf of the hoop stress


done-fourth of hoop stress



The torsional rigidity of a shaft is expressed by the_______________?


amaximum torque it can transmit


bnumber of cycles it undergoes before failure


celastic limit up to which it resists torsion, shear and bending stresses


dtorque required to produce a twist of one radian per unit length of shaft



A key is subjected to side pressure as well at shearing forces. These pressures are called_________________?


abearing stresses


bfatigue stresses


cfatigue stresses


dresultant stresses


View Answer bearing stresses

Shear stress induced in a shaft subjected to tension will be__________________?


amaximum at periphery and zero at center


bmaximum at center


cuniform throughout


dnone of the above


View Answer none of the above

A particle inside a hollow sphere of radius r, having coefficient of friction -rr can rest upto height of___________________?


ar/2


br/A


cr/%


d0.134 r


View Answer 0.134 r

The maximum frictional force which comes into play when a body just begins to slide over another surface is called________________?


alimiting friction


bsliding friction


crolling friction


dkinematic friction


View Answer limiting friction

If n = number of members andy = number of joints, then for a perfect frame, n =________________?


aj-2


b2j-l


c2/-3


d3/-2


View Answer 2/-3

A cable with a uniformly distributed load per horizontal metre run will take the following shape_________________?


astraight line


bparabola


chyperbola


delliptical


View Answer parabola

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