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Engineering Mechanics

Engineering Mechanics
The center of gravity of a semi-circle lies at a distance of __________ from its base measured along the vertical radius.

4r/ 3π
8r/3
3r/4π
3r/ 8

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Engineering Mechanics
The amplitude is always __________ radius of the circle.

Equal to
Less than
Greater than
None of these

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Engineering Mechanics
The moment of inertia of a solid sphere of mass ‘m’ and radius ‘r’ is

2mr²/3
2mr²/5
mr²
mr²/2

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Engineering Mechanics
The velocity ratio of a differential wheel and axle with 'D' as the diameter of effort wheel and d1 and d2 as the diameters of larger and smaller axles respectively, is

2D/(d₁ + d₂)
2D/(d₁ - d₂)
D/(d₁ - d₂)
D/(d₁ + d₂)

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Engineering Mechanics
According to parallel axis theorem, the moment of inertia of a section about an axis parallel to the axis through center of gravity (i.e. IP) is given by(where, A = Area of the section, IG = Moment of inertia of the section about an axis passing through its C.G., and h = Distance between C.G. and the parallel axis.)

IP = IG + Ah2
IP = IG - Ah2
IP = IG / Ah2
IP = Ah2 / IG

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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

16 cm4
9 cm4
12 cm4
20 cm4

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MORE MCQ ON Engineering Mechanics

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