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Machine Design

Machine Design
The groove angle of pulleys for V-belt is

340 to 360
300 to 320
420 to 450
More than 400

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Machine Design
A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is τ. The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be

τ/2
2 τ
4 τ
τ

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Machine Design
In designing a sleeve coupling, length of the sleeve is taken as (where d = Diameter of the shaft)

2d + 13 mm
2d + 20 mm
3.5 d
d + 17 mm

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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)

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

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Machine Design
The form factor of a helical gear __________ with the increase in the helix angle.

Remains constant
None of these
Increases
Decreases

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Machine Design
The rivet head used for boiler plate riveting is usually

Conical head
Pan Head
Counter sunk head
Snap head

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