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Machine Design

Machine Design
The usual proportion for the width of key is (where d = Diameter of shaft or diameter of hole in the hub)

d/4
d/2
d/6
d/8

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Machine Design
In order to avoid tearing of the plate at an edge, the distance from the centre line of the rivet hole to the nearest edge of the plate should be equal to (where d = Diameter of rivet hole)

1.5 d
2 d
2.5 d
1 d

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Machine Design
Wire ropes as compared to cotton ropes

All of these
Offer silent operation
Can withstand shock loads
Are lighter in weight

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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

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

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Machine Design
A metal pipe of 1 m diameter contains a fluid having a pressure of 1 N/mm². If the permissible tensile stress in the metal is 20 N/mm², then the thickness of the metal required for making the pipe will be

25 mm
5 mm
10 mm
15 mm

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Machine Design
For a shaft diameter of 100 mm, the number of bolts in a flange coupling should be

8
6
10
4

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