Strength of Materials
The resultant of the following three couples 20 kg force, 0.5 m arm, + ve sense 30 kg force, 1 m arm, – ve sense 40 kg force, 0.25 m arm, + ve sense having arm of 0.5 m will be

20 kg, + ve sense
10 kg, – ve sense
10 kg, + ve sense
20 kg, – ve sense

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Strength of Materials
Limiting force of friction is the

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
Ratio of limiting friction and normal reaction
the friction force acting when the body is in motion

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