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Strength of Materials

Strength of Materials
The M.I. of hollow circular section about a central axis perpendicular to section as compared to its M.I. about horizontal axis is

half
four times
double
same

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Strength of Materials
Tangent of angle of friction is equal to

limiting friction
coefficient of friction
kinetic friction
angle of repose

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Strength of Materials
Two non-collinear parallel equal forces acting in opposite direction

constitute a couple
balance each other
constitute a moment of couple
constitute a moment

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Strength of Materials
The effort required to lift a load W on a screw jack with helix angle a and angle of friction

Wtan(a + <)>)
Wcos(a + )
Wtan(a-<)>)
Wsin(a + <(>)

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Strength of Materials
If n = number of members andy = number of joints, then for a perfect frame, n =

j-2
2/-3
(b)2j-l
(d)3/-2

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Strength of Materials
Dynamic friction as compared to static friction is

same
may be less of more depending on nature of surfaces and velocity
more
less

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