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Engineering Mechanics

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

Less than
Equal to
None of these
Greater than

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

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Engineering Mechanics
Two forces are acting at an angle of 120°. The bigger force is 40 N and the resultant is perpendicular to the smaller one. The smaller force is

20 N
120 N
40 N
None of the listed here

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Engineering Mechanics
If the gravitational acceleration at any place is doubled, then the weight of a body will be

2g
√2.g
g/2
g

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Engineering Mechanics
The range of projectile will be maximum for a given velocity of projectile, when the angle of projection (α) is

β/2
45° + β/2
30° + β/2
60° + β/2

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Engineering Mechanics
A force while acting on a body may

Change its motion
Give rise to the internal stresses in it
Balance the forces, already acting on it
All of these

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