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Engineering Mechanics

Engineering Mechanics
An ideal machine is one whose efficiency is

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

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Engineering Mechanics
In actual machines, mechanical advantage is _________ velocity ratio.

Greater than
None of these
Less than
Equal to

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Engineering Mechanics
The velocity ratio in case of an inclined plane inclined at angle 'θ' to the horizontal and weight being pulled up the inclined plane by vertical effort is

cosecθ
cosθ
sinθ
tanθ

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Engineering Mechanics
When a body falls freely under gravitational force, it possesses __________ weight.

No
Minimum
None of these
Maximum

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

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Engineering Mechanics
In order to determine the effects of a force, acting on a body, we must know

Magnitude of the force
Nature of the force i.e. whether the force is push or pull
Line of action of the force
All of these

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