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Engineering Mechanics

Engineering Mechanics
The maximum mechanical advantage of a lifting machine is

1 / m
m
1 - m
1 + m

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Engineering Mechanics
One joule is equal to

0.1 N-m
1 N-m
10 N-m
100 N-m

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

Upwards at its upper end
Perpendicular to the wall at its upper end
Downwards at its upper end
Zero at its upper end

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Engineering Mechanics
The mechanical advantage of a lifting machine is the ratio of

Load lifted to the effort applied
Output to the input
All of these
Distance moved by effort to the distance moved by load

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

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Engineering Mechanics
In a single threaded worm and worm wheel, the number of teeth on the worm is 50. The diameter of the effort wheel is 100 mm and that of load drum is 50 mm. The velocity ratio is

400
100
200
50

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MORE MCQ ON Engineering Mechanics

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