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Machine Design

Machine Design
The size of a gear is usually specified by

Pitch circle diameter
Diametral pitch
Circular pitch
Pressure angle

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Machine Design
The diameter of knuckle pin in a knuckle joint is usually taken as (where d = Diameter of the rod)

0.5 d
1.2 d
0.8 d
d

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Machine Design
A circular shaft can transmit a torque of 5 kN-m. If the torque is reduced to 4 kN-m, then the maximum value of bending moment that can be applied to the shaft is

3 kN-m
1 kN-m
4 kN-m
2 kN-m

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Machine Design
Allen bolts are

Designed for shock load
Used in aircraft application
Self locking bolts
Provided with hexagonal depression in head

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Machine Design
In designing a key, it is assumed that the distribution of forces along the length of key

Varies linearly
Varies exponentially, being more at the torque-input end
Is uniform throughout
Varies exponentially, being less at the torque-input end

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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)

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

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