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Machine Design

Machine Design
The product of the diametral pitch and circular pitch is equal to

1/π
π
π × number of teeth
1

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Machine Design
A self locking screw has

Coefficient of friction is greater than tangent of load angle
Course threads
Fine threads
Hole for inserting split pin

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Machine Design
When a helical compression spring is cut into halves, the stiffness of the resulting spring will be

One-fourth
Double
Same
One-half

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Machine Design
In designing a flange coupling, the pitch circle diameter of bolts is taken as (where d = Diameter of the shaft)

2 d
5 d
4 d
3 d

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Machine Design
A shaft is subjected to fluctuating loads for which the normal torque (T) and bending moment (M) are 1000 N-m and 500 N-m respectively. If the combined shock and fatigue factor for bending is 1.5 and combined shock and fatigue factor for torsion is 2, then the equivalent twisting moment for the shaft is

2100 N-m
2000 N-m
2136 N-m
2050 N-m

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Machine Design
According to Indian standards, a bolt thread of 6 mm size of coarse pitch and with allowance on the threads and normal tolerance grade is designated as

M8 - 6d
M6
M6 - 8d
M8

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