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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
A screw jack used for lifting the loads is

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

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Engineering Mechanics
Moment of inertia of a circular section about an axis perpendicular to the section is

πd3/16
πd3/32
πd4/32
πd4/64

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Engineering Mechanics
The periodic time of one oscillation for a simple pendulum is (where l = Length of the pendulum.)

None of these
(1/2π). √(g/l)
(1/2π). √(l/g)
2π. √(l/g)

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Engineering Mechanics
The wheels of a moving car possess

Kinetic energy of translation only
Kinetic energy of translation and rotation both
Kinetic energy of rotation only
Potential energy only

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Engineering Mechanics
The moment of inertia of a sphere of mass 'm' and radius 'r', about an axis tangential to it, is

7mr²/3
7mr²/5
2mr²/3
2mr²/5

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