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Engineering Mechanics

Engineering Mechanics
The maximum efficiency of a lifting machine is

m/V.R.
1/(m × V.R.)
V.R./m
1/m

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Engineering Mechanics
An ideal machine is one whose efficiency is

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

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Engineering Mechanics
Center of gravity of a thin hollow cone lies on the axis at a height of

One-fourth of the total height above base
One-third of the total height above base
One-half of the total height above base
Three-eighth of the total height above the base

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Engineering Mechanics
The algebraic sum of the resolved parts of a number of forces in a given direction is equal to the resolved part of their resultant in the same direction. This is known as

None of these
Principle of independence of forces
Principle of transmissibility of forces
Principle of resolution of forces

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Engineering Mechanics
The centre of gravity of an isosceles triangle with base (p) and sides (q) from its base is

(4p² - q²)/6
(p² + q²)/4
(p² - q²)/4
[√(4p² - q²)]/6

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Engineering Mechanics
The centre of gravity of a uniform lamina lies at

The midpoint of its axis
The centre of heavy portion
The bottom surface
All of these

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