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Engineering Mechanics

Engineering Mechanics
A screw jack used for lifting the loads is

A reversible machine
None of these
An ideal machine
A non-reversible machine

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Engineering Mechanics
The forces, which meet at one point, but their lines of action do not lie in a plane, are called

Coplanar non-concurrent forces
Non-coplanar concurrent forces
Non-coplanar non-concurrent forces
Intersecting forces

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Engineering Mechanics
The forces, whose lines of action are parallel to each other and act in the same directions, are known as

Coplanar non-concurrent forces
Like parallel forces
Coplanar concurrent forces
Unlike parallel forces

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

2n
2n - 1
n²
n

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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

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

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Engineering Mechanics
The algebraic sum of moments of the forces forming couple about any point in their plane is

Both of above are wrong
Constant
Equal to the moment of the couple
Both of above are correct

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