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Engineering Mechanics

Engineering Mechanics
The velocity ratio of a first system of pulleys with 4 pulleys is

4
8
20
16

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Engineering Mechanics
The acceleration of a body sliding down an inclined surface is

g cosθ
g tanθ
g sinθ
None of these

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Engineering Mechanics
A trolley wire weighs 1.2 kg per meter length. The ends of the wire are attached to two poles 20 meters apart. If the horizontal tension is 1500 kg find the dip in the middle of the span

4.0 cm
2.5 cm
3.0 cm
5.0 cm

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Engineering Mechanics
An ideal machine is one whose efficiency is

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

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Engineering Mechanics
Two forces are acting at an angle of 120°. The bigger force is 40 N and the resultant is perpendicular to the smaller one. The smaller force is

None of the listed here
120 N
20 N
40 N

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Engineering Mechanics
If rain is falling in the opposite direction of the movement of a pedestrian, he has to hold his umbrella

Less inclined when moving
More inclined when moving
Less inclined when standing
More inclined when standing

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