Engineering Mechanics
The algebraic sum of moments of the forces forming couple about any point in their plane is

Both of above are correct
Equal to the moment of the couple
Both of above are wrong
Constant

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Engineering Mechanics
Angle of friction is the

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

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