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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 maximum height of a projectile on a horizontal plane, is

u² sin²α/2g
u² cos²α/g
u² sin²α/g
u² cos²α/2g

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Engineering Mechanics
If a number of forces are acting at a point, their resultant is given by

√[(∑V)2 + (∑H)2]
√[(∑V)2 +(∑H)2 +2(∑V)(∑H)]
(∑V)2 + (∑H)2
(∑V)2 +(∑H)2 +2(∑V)(∑H)

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Engineering Mechanics
On a ladder resting on smooth ground and leaning against vertical wall, the force of friction will be

Towards the wall at its upper end
Downwards at its upper end
Away from the wall at its upper end
Upwards at its upper end

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Engineering Mechanics
The maximum efficiency of a lifting machine is

1/m
V.R./m
1/(m × V.R.)
m/V.R.

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Engineering Mechanics
If the resultant of two equal forces has the same magnitude as either of the forces, then the angle between the two forces is

120°
30°
90°
60°

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MORE MCQ ON Engineering Mechanics

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