Strength of Materials
Two coplanar couples having equal and opposite moments

Are equivalent
Produce a moment of couple
Balance each other
Produce a couple and an unbalanced force

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Strength of Materials
Limiting force of friction is the

Ratio of limiting friction and normal reaction
Tangent of angle between normal reaction and the resultant of normal reaction and limiting friction
The friction force acting when the body is just about to move
the friction force acting when the body is in motion

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Strength of Materials
If a rigid body is in equilibrium under the action of three forces, then

the lines of action of these forces are parallel
the lines of action of these forces meet in a point & the lines of action of these forces are parallel
the lines of action of these forces meet in a point
these forces are equal

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Strength of Materials
According to principle of transmissibility of forces, the effect of a force upon a body is

Maximum when it acts at the center of gravity of a body
The same at every point in its line of action
Minimum when it acts at the C.G. of the body
Different at different points in its line of action

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