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Machine Design

Machine Design
Taper usually provided on cotter is

1 in 24
1 in 40
1 in 10
1 in 5

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Machine Design
When an open coiled helical compression spring is subjected to an axial compressive load, the maximum shear stress induced in the wire is (where D = Mean diameter of the spring coil, d = Diameter of the spring wire, K = Wahl's stress factor, and W = Axial compressive load on the spring)

(8WD/ πd3) × K
(WD/ πd3) × K
(4WD/ πd3) × K
(2WD/ πd3) × K

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Machine Design
If a load W is applied instantaneously on a bar; Then the stress induced in bar will

Depend on other considerations
Decrease with decrease in y
Increase with increase in y
Be independent of ratio of mass of load W to mass of bar (y)

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Machine Design
The contact ratio for gears is

Zero
Greater than one
None of these
Less than one

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Machine Design
In unilateral system of tolerance, the tolerance is allowed on

Both sides of the actual size
One side of the actual size
Both sides of the nominal size
One side of the nominal size

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Machine Design
When two non-parallel or intersecting but coplanar shafts are connected by gears, the arrangement is known as,

Bevel gearing
Helical gearing
None of these
Worm gearing

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