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Machine Design

Machine Design
The pitch diameter is the __________ diameter of an external or internal screw thread.

Effective
None of these
Smallest
Largest

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Machine Design
For a shaft diameter of 200 mm, the number of bolts in a marine flange coupling should be

6
4
8
10

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Machine Design
The washer is generally specified by its

Thickness
Outer diameter
Mean diameter
Hole diameter

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Machine Design
The maximum efficiency of a square threaded screw is

(1 + sinφ)/ (1 - sinφ)
(1 - sinφ)/ (1 + sinφ)
(1 + cosφ)/ (1 - sinφ)
(1 - sinφ)/ (1 + cosφ)

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Machine Design
According to I.B.R., the factor of safety of riveted joint should not be less than

4
2
1
3

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Machine Design
Euler’s formula for a mild steel column is not valid if the slenderness ratio is

90
60
120
100

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