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Machine Design

Machine Design
For tight leakage joints, following type of thread is best suited

Square
NPT (national pipe threads).
Metric
Buttress

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Machine Design
The root angle of a bevel gear is equal to

Pitch angle + dedendum angle
Pitch angle - dedendum angle
Pitch angle + addendum angle
Pitch angle - addendum angle

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Machine Design
The V-belts are particularly suitable for __________ drives.

Short
Long
Both A and B
None of these

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Machine Design
A column of length l is fixed at both ends. The equivalent length of the column is

2 l
l
l/√2
l/2

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Machine Design
In order to obtain bolt of uniform strength

Tighten die bolt properly
Drill an axial hole through head up to threaded portion so that shank area is equal to root area of thread
Increase shank diameter
Increase its length

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Machine Design
The helix angle for single helical gears ranges from

35° to 50°
20° to 35°
15° to 20°
10° to 15°

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