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Engineering Mechanics

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
Q / P
P + Q
P / Q

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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
The velocity ratio for the third system of pulleys is

n²
2n
2n - 1
n

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Engineering Mechanics
A redundant frame is also called __________ frame.

None of these
Imperfect
Deficient
Perfect

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

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Engineering Mechanics
If the body falls freely under gravity, then the gravitational acceleration is taken as

+9.8 m/s2
-9.8 m/s2
-8.9 m/s2
+8.9 m/s2

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