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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/2
d/4
d/6
d/8

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Machine Design
In a butt welded joint, the size of weld is __________ the throat of weld.

0.5 times
Equal to
Double
2 times

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Machine Design
A plate with an elliptical hole in the centre, with semi-major axis (a) perpendicular to the direction of loading and semi-minor axis (b) along the direction of loading, is subjected to a pull P. The maximum stress induced at the edge of the hole is equal to (where σ = Stress for a plate with no hole i.e. nominal stress)

σ [1 + (b/2a)]
σ [1 + (2a/b)]
σ [1 + (b/3a)]
σ [1 + (3a/b)]

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Machine Design
Shaft coupling is used in machinery to

Introduce protection against over loads
Reduce the transmission of shock loads
Introduce mechanical flexibility
All of these

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Machine Design
In a partial journal bearing, the angle of contact of the bearing with the journal is

360°
270°
120°
180°

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Machine Design
When the belt is transmitting maximum power, the belt speed should be (Where, m = mass of belt per meter (kg/m) and Pmax = maximum permissible tension in belt (N))

√(Pmax / 3m)
√(Pmax / m)
√(3m /Pmax)
√(Pmax / 2m)

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