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Engineering Mechanics

Engineering Mechanics
Moment of inertia of a triangular section of base (b) and height (h) about an axis through its base, is

bh3/8
bh3/36
bh3/12
bh3/4

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Engineering Mechanics
Two like parallel forces are acting at a distance of 24 mm apart and their resultant is 20 N. It the line of action of the resultant is 6 mm from any given force, the two forces are

15 N and 5 N
None of these
15 N and 15 N
20 N and 5 N

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Engineering Mechanics
Moment of inertia of a triangular section of base (b) and height (h) about an axis passing through its C.G. and parallel to the base, is

bh3/12
bh3/4
bh3/36
bh3/8

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Engineering Mechanics
For a self locking machine, the efficiency must be

Less than 50%
1
Equal to 50%
Greater than 50%

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

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

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

75 mm
87.5 mm
125 mm
50 mm

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