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Engineering Mechanics

Engineering Mechanics
An ideal machine is one whose efficiency is

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

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Engineering Mechanics
The moment of inertia of a square of side a about its diagonal is

a³/12
a²/8
a⁴/12
a⁴/16

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Engineering Mechanics
Moment of inertia of a triangular section of base (b) and height (h) about an axis passing through its C.G. and parallel to the base, is

bh3/8
bh3/36
bh3/4
bh3/12

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Engineering Mechanics
Moment of inertia of a rectangular section having width (b) and depth (d) about an axis passing through its C.G. and parallel to the width (b), is

bd³/36
db³/36
bd³/12
db³/12

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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
-8.9 m/s2
-9.8 m/s2

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Engineering Mechanics
The moment of inertia of a solid cone of mass ‘m’ and base radius ‘r’ about its vertical axis is

3mr²/10
2mr²/5
4mr²/5
3mr²/5

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