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Machine Design

Machine Design
A bench vice has following type of threads

Buttress
Acme
Metric
Square

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Machine Design
Two shafts ‘A’ and ‘B’ under pure torsion are of identical length and identical weight and are made of the same material. The shaft ‘A’ is solid and the shaft ‘B’ is hollow. We can say that

Shaft B is better than shaft A
Both the shafts are equally good
None of these
Shaft A is better than shaft B

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Machine Design
In worm gears, the pressure angle is __________ the angle between two inclined faces in axial plane.

Half
Twice
None of these
Thrice

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Machine Design
An alien bolt is

Self locking bolt
Provided with hexagonal depression in head
Same as stud
Used in high speed components

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Machine Design
For a shoe brake, the equivalent coefficient of friction is equal to (where μ = Actual coefficient of friction, and θ = Semi-block angle)

μ sinθ/(2θ + sin 2θ)
4μ sinθ/(2θ + sin 2θ)
4μ sinθ/(θ + sinθ)
2μ sinθ/(θ + sinθ)

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Machine Design
Which of the following is an anti-friction bearing?

Needle bearing
Collar bearing
Pedestal bearing
Journal bearing

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