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Engineering Mechanics

Engineering Mechanics
The velocity ratio of a first system of pulleys with 4 pulleys is

16
4
20
8

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Engineering Mechanics
A spherical body is symmetrical about its perpendicular axis. According to Routh's rule, the moment of inertia of a body about an axis passing through its centre of gravity is (where, M = Mass of the body, and S = Sum of the squares of the two semi-axes.)

MS/5
None of these
MS/3
MS/4

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Engineering Mechanics
The law of the machine is (where P = Effort applied to lift the load, m = A constant which is equal to the slope of the line, W = Load lifted, and C = Another constant which represents the machine friction.)

P = mW - C
P = mW + C
P = m/W + C
P = C - mW

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Engineering Mechanics
The moment of inertia of a thin rod of mass 'm' and length 'l', about an axis through its centre of gravity and perpendicular to its length is

ml2/12
ml2/ 6
ml2/8
ml2/4

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Engineering Mechanics
The coefficient of friction depends upon

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

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Engineering Mechanics
The efficiency of a lifting machine is the ratio of

All of these
Mechanical advantage to the velocity ratio
Work done by the machine to the work done on the machine
Output to the input

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