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Engineering Mechanics

Engineering Mechanics
The maximum efficiency of a lifting machine is

m/V.R.
1/m
1/(m × V.R.)
V.R./m

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Engineering Mechanics
If ‘P’ is the force acting on the body, ‘m’ is the mass of the body and ‘a’ is the acceleration of the body, then according to Newton's second law of motion,

P + m.a = 0
P × m.a = 0
P/m.a = 0
P - m.a = 0

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Engineering Mechanics
A couple produces

Combined translatory and rotational motion
None of these
Translatory motion
Rotational motion

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Engineering Mechanics
The maximum height of a projectile on a horizontal plane, is

u² cos²α/2g
u² sin²α/2g
u² sin²α/g
u² cos²α/g

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Engineering Mechanics
In ideal machines, mechanical advantage is __________ velocity ratio.

Less than
Equal to
Greater than
None of these

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Engineering Mechanics
The moment of inertia of a rectangular section 3 cm wide and 4 cm deep about X-X axis is

20 cm4
16 cm4
12 cm4
9 cm4

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