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Engineering Mechanics

Engineering Mechanics
The maximum mechanical advantage of a lifting machine is

1 - m
1 / m
1 + m
m

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Engineering Mechanics
A framed structure is perfect, if the number of members are __________ (2j - 3), where j is the number of joints.

None of these
Greater than
Equal to
Less than

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Engineering Mechanics
Two balls of equal mass and of perfectly elastic material are lying on the floor. One of the balls with velocity ‘v’ is made to strike the second ball. Both the balls after impact will move with a velocity

v/2
v/8
v
v/4

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Engineering Mechanics
Mass moment of inertia of a uniform thin rod of mass M and length (l) about its mid-point and perpendicular to its length is

(1/3) Ml²
(1/12) Ml²
(2/3) Ml²
(3/4) Ml²

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Engineering Mechanics
In a screw jack, the effort required to lift the load is given by (where W = Load lifted, α = Helix angle, and φ = Angle of friction.)

P = W tan (φ - α)
P = W tan (α - φ)
P = W cos (α + φ)
P = W tan (α + φ)

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Engineering Mechanics
A ladder is resting on a smooth ground and leaning against a rough vertical wall. The force of friction will act

Away from the wall at its upper end
Upward at its upper end
Downward at its upper end
Towards the wall at its upper end

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