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Engineering Mechanics

Engineering Mechanics
A framed structure is imperfect, if the numbers of members are __________ (2j - 3).

Greater than
Equal to
Less than
Either (B) or (C)

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

n
n²
2n - 1
2n

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Engineering Mechanics
The maximum height of a projectile on a horizontal plane, is

u² sin²α/2g
u² sin²α/g
u² cos²α/2g
u² cos²α/g

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Engineering Mechanics
If the body falls freely under gravity, then the gravitational acceleration is taken as

+9.8 m/s2
-8.9 m/s2
-9.8 m/s2
+8.9 m/s2

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Engineering Mechanics
In a screw jack, the effort required to lower the load is __________ the effort required to raise the same load.

Less than
More than
None of these
Equal to

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

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