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Machine Design

Machine Design
For general industrial machinery, the ratio of the length of journal to its diameter is taken as

0.5 to 1
1 to 2
3 to 5
5 to 10

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Machine Design
According to maximum normal stress theory, the maximum normal stress in the shaft is

(1/2) × [σ + √(σ² × 4τ²)]
(1/2) × √(σ² × 4τ²)
√(σ² × 4τ²)
σ + √(σ² × 4τ²)

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Machine Design
When the screw in a mechanical screw jack rotates, the load kept on the top of it moves

Axially downwards
Axially upwards
None of these
Axially upwards or downwards

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Machine Design
When two non-intersecting and non-coplanar shafts are connected by gears, the arrangement is known as

Spur gearing
Spiral gearing
Helical gearing
Bevel gearing

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Machine Design
For circumferential joint in boilers, the type of joint used is

Butt joint with double cover plate
Butt joint with single cover plate
Lap joint with one ring overlapping the other
Any one of the above

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Machine Design
The resistance to fatigue of a material is measured by

Young's modulus
Ultimate tensile strength
Endurance limit
Elastic limit

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