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Engineering Mechanics

Engineering Mechanics
A weight of 1000 N can be lifted by an effort of 80 N. If the velocity ratio is 20, the machine is

Ideal
Reversible
Non-reversible
None of these

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Engineering Mechanics
The velocity ratio for the third system of pulleys is

2n
n²
2n - 1
n

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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

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

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

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

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Engineering Mechanics
Mass moment of inertia of a uniform thin rod of mass M and length (l) about its mid-point and perpendicular to its length is

(3/4) Ml²
(1/12) Ml²
(2/3) Ml²
(1/3) Ml²

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Engineering Mechanics
A machine having an efficiency greater than 50%, is known as

Neither reversible nor non-reversible machine
Ideal machine
Reversible machine
Non-reversible machine

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