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Engineering Mechanics

Engineering Mechanics
The resultant of two forces P and Q (such that P > Q) acting along the same straight line, but in opposite direction, is given by

P + Q
Q / P
P - Q
P / Q

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Engineering Mechanics
A machine having an efficiency less than 50%, is known as

Neither reversible nor non-reversible machine
Non-reversible machine
Ideal machine
Reversible machine

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Engineering Mechanics
The three forces of 100 N, 200 N and 300 N have their lines of action parallel to each other but act in the opposite directions. These forces are known as

Unlike parallel forces
Coplanar non-concurrent forces
Like parallel forces
Coplanar concurrent forces

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Engineering Mechanics
Efficiency of a screw jack is given by (where α = Helix angle, and φ = Angle of friction.)

tan(α - φ)/tanα
tanα/tan (α + φ)
tan(α + φ)/tanα
None of these

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Engineering Mechanics
The velocity ratio for the third system of pulleys is

n
2n
n²
2n - 1

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Engineering Mechanics
Coplanar non-concurrent forces are those forces which __________ at one point, but their lines of action lie on the same plane.

None of these
Meet
Do not meet
Either ‘A’ or ‘B’

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