Mechanical Engineering MCQs

Page No. 132

Rivets are made of following type of material_________________?


atough

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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

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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

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bnumber of cycles it undergoes before failure

✖


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

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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

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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/%

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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

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b2j-l

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c2/-3

✓


d3/-2

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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

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View Answer parabola

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