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Engineering Mechanics

Engineering Mechanics
The velocity ratio of a differential pulley block with D and d as the diameters of larger and smaller pulley, is

2D/(D + d)
2D/(D - d)
D/(D + d)
D/(D - d)

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Engineering Mechanics
Three forces acting on a rigid body are represented in magnitude, direction and line of action by the three sides of a triangle taken in order. The forces are equivalent to a couple whose moment is equal to

None of these
Half the area of the triangle
Area of the triangle
Twice the area of the triangle

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Engineering Mechanics
The force required to move the body up the plane will be minimum if it makes an angle with the inclined plane __________ the angle of friction.

Greater than
Equal to
Less than
None of these

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Engineering Mechanics
The centre of gravity a T-section 100 mm × 150 mm × 50 mm from its bottom is

50 mm
87.5 mm
125 mm
75 mm

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Engineering Mechanics
Static friction is always __________ dynamic friction.

None of these
Less than
Greater than
Equal to

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Engineering Mechanics
A rubber ball is dropped from a height of 2 m. If there is no loss of velocity after rebounding, the ball will rise to a height of

2 m
4 m
1 m
3 m

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