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Engineering Mechanics

Engineering Mechanics
Moment of inertia of a circular section about its diameter (d) is

πd3/32
πd3/16
πd4/64
πd4/32

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Engineering Mechanics
The C.G. of a solid hemisphere lies on the central radius 3r

At distance — from the plane base 3r
At distance — from the plane base 3r
At distance — from the plane base
At distance — from the plane base 3r

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Engineering Mechanics
The moment of inertia of a rectangular section 3 cm wide and 4 cm deep about X-X axis is

9 cm4
12 cm4
16 cm4
20 cm4

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Engineering Mechanics
When two elastic bodies collide with each other,

The two bodies begin to regain their original shape
The two bodies tend to compress and deform at the surface of contact
The two bodies will momentarily come to rest after collision
All of these

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Engineering Mechanics
If n = number of members and y = number of joints, then for a perfect frame, n = ?

43892
43864
43865
43832

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

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