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Machine Design

Machine Design
The size of a gear is usually specified by

Diametral pitch
Pitch circle diameter
Pressure angle
Circular pitch

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Machine Design
In worm gears, the angle between the tangent to the pitch helix and an element of the cylinder, is known as

Pressure angle
Helix angle
Pitch lead angle
None of these

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Machine Design
The included angle for the British Association thread is

55°
47.3°
60°
29°

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Machine Design
Belt slip may occur due to

Loose belt
All of these
Driving pulley too small
Heavy load

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Machine Design
According to I.B.R., the efficiency of a double riveted butt joint with double cover straps of equal width should be

70 to 83%
45 to 60%
63 to 70%
80 to 90%

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Machine Design
According to Indian standards, the diameter of rivet hole is made larger than the basic size of rivet by

2 mm for rivet diameter from 39 mm to 48 mm
0.5 mm up to rivet diameter of 24 mm
1 mm for rivet diameter from 27 mm to 36 mm
All of these

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