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Machine Design

Machine Design
The railway carriage couplings have

Square threads
Acme threads
Knuckle threads
Buttress threads

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Machine Design
The ratio of driving tensions for flat belts, neglecting centrifugal tension, is (where T₁, and T₂ = Tensions on the tight and slack sides of belt respectively, μ = Coefficient of friction, between the belt and pulley, and θ = Angle of contact)

log (T₁/T₂) = μθ
T₁/T₂ = μθ
T₁/T₂ = log μθ
T₁/T₂ =eμθ

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Machine Design
According to I.B.R., shearing resistance required to shear off the rivet per pitch length (in double shear) is (where n = Number of rivets per pitch length)

1.875 × (π/4) d² × τ × n
2 × (π/4) d² × τ × n
3 × (π/4) d² × τ × n
(π/4) d² × τ × n

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Machine Design
For high speed engines, the cam follower should move with

Uniform velocity
Uniform acceleration and retardation
Simple harmonic motion
Cycloidal motion

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Machine Design
Which of the following screw thread is adopted for power transmission in either direction?

Square threads
Acme threads
Multiple threads
Buttress threads

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Machine Design
A screw is said to be over hauling screw, if the

Efficiency of screw is 100%
Friction angle is less than helix angle
Friction angle is equal to helix angle
Friction angle is more than helix angle

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