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Engineering Mechanics

Engineering Mechanics
The coefficient of friction depends upon

Nature of surfaces
Shape of the surfaces
Area of contact
All of these

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

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

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Engineering Mechanics
An ideal machine is one whose efficiency is

Between 60 and 70 %
Between 80 and 90%
Between 70 and 80%
1

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Engineering Mechanics
The velocity of a particle (v) moving with simple harmonic motion, at any instant is given by (where, r = Amplitude of motion, and y = Displacement of the particle from mean position.)

ω².√(y² - r²)
ω.√(r² - y²)
ω.√(y² - r²)
ω².√(r² - y²)

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Engineering Mechanics
Efficiency of a screw jack is given by (where α = Helix angle, and φ = Angle of friction.)

tan(α - φ)/tanα
tanα/tan (α + φ)
None of these
tan(α + φ)/tanα

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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

12 cm4
16 cm4
9 cm4
20 cm4

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MORE MCQ ON Engineering Mechanics

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