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Engineering Mechanics

Engineering Mechanics
The velocity ratio for the first system of pulleys is (where n is the number of pulleys.)

2n - 1
n
2n
n²

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Engineering Mechanics
In order to double the period of simple pendulum, the length of the string should be

None of these
Doubled
Quadrupled
Halved

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Engineering Mechanics
The point, through which the whole weight of the body acts, irrespective of its position, is known as

Center of gravity
Center of percussion
Moment of inertia
Center of mass

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Engineering Mechanics
Moment of inertia of a circular section about an axis perpendicular to the section is

πd3/32
πd3/16
πd4/64
πd4/32

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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
9 cm4
16 cm4
20 cm4

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Engineering Mechanics
The resultant of the two forces ‘P’ and ‘Q’ is ‘R’. If ‘Q’ is doubled, the new resultant is perpendicular to ‘P’. Then

Q = 2R
P = Q
Q = R
None of the listed here

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