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Engineering Mechanics

Engineering Mechanics
The time of flight (t) of a projectile on a horizontal plane is given by

t = 2u/g.sinα
t = 2u. cosα/g
t = 2u. tanα/g
t = 2u. sinα/g

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Engineering Mechanics
A machine having an efficiency less than 50%, is known as

Non-reversible machine
Ideal machine
Reversible machine
Neither reversible nor non-reversible machine

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Engineering Mechanics
From a circular plate of diameter 6 cm is cut out a circle whose diameter is a radius of the plate. Find the e.g. of the remainder from the centre of circular plate

0.5 cm
1.5 cm
1.0 cm
2.5 cm

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Engineering Mechanics
The moment of inertia of a thin disc of mass ‘m’ and radius ‘r’, about an axis through its center of gravity and perpendicular to the plane of the disc is

mr²/8
mr²/4
mr²/2
mr²/6

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Engineering Mechanics
A differential pulley block has larger and smaller diameters of 100 mm and 80 mm respectively. Its velocity ratio is

40
20
5
10

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Engineering Mechanics
In order to determine the effects of a force, acting on a body, we must know

Line of action of the force
Nature of the force i.e. whether the force is push or pull
All of these
Magnitude of the force

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