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Engineering Mechanics

Engineering Mechanics
The velocity of a particle moving with simple harmonic motion is _________ at the mean position.

None of these
Minimum
Zero
Maximum

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Engineering Mechanics
A framed structure is perfect, if the number of members are __________ (2j - 3), where j is the number of joints.

Greater than
None of these
Less than
Equal to

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Engineering Mechanics
An ideal machine is one whose efficiency is

Between 60 and 70 %
Between 70 and 80%
Between 80 and 90%
1

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Engineering Mechanics
The forces which meet at one point, but their lines of action __________ on the same plane, are Known as non-coplanar concurrent forces.

Either A or B
Lie
Do not lie
None of these

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Engineering Mechanics
If a number of forces are acting at a point, their resultant is given by

√[(∑V)2 +(∑H)2 +2(∑V)(∑H)]
√[(∑V)2 + (∑H)2]
(∑V)2 + (∑H)2
(∑V)2 +(∑H)2 +2(∑V)(∑H)

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Engineering Mechanics
The centre of gravity a T-section 100 mm × 150 mm × 50 mm from its bottom is

87.5 mm
125 mm
50 mm
75 mm

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