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Engineering Mechanics

Engineering Mechanics
The ratio of static friction to dynamic friction is always

Less than one
Greater than one
None of these
Equal to one

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Engineering Mechanics
The total energy possessed by a system of moving bodies

Is constant at every instant
Is maximum in the start and minimum at the end
Varies from point to point
Is minimum in the start and maximum at the end

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Engineering Mechanics
The maximum efficiency of a screw jack is

(1 + sinφ)/(1 - sinφ)
(1 + tanφ)/(1 - tanφ)
(1 - tanφ)/(1 + tanφ)
(1 - sinφ)/(1 + sinφ)

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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

20
40
5
10

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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.

None of these
Less than
Equal to
Greater than

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Engineering Mechanics
The resultant of two forces P and Q (such that P > Q) acting along the same straight line, but in opposite direction, is given by

P - Q
P / Q
Q / P
P + Q

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