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Machine Design

Machine Design
The material commonly used for machine tool bodies is

Brass
Cast iron
Mild steel
Aluminium

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Machine Design
Creep in belt is due to

All of these
Material of the belt
Uneven extensions and contractions due to varying tension
Material of the pulley

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Machine Design
A shaft is subjected to fluctuating loads for which the normal torque (T) and bending moment (M) are 1000 N-m and 500 N-m respectively. If the combined shock and fatigue factor for bending is 1.5 and combined shock and fatigue factor for torsion is 2, then the equivalent twisting moment for the shaft is

2050 N-m
2000 N-m
2136 N-m
2100 N-m

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Machine Design
A tube has the following advantage over pipe

All of these
Greater shock absorption
Lighter and easier to handle
Smoother inside walls

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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)

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

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Machine Design
The most important dimension in the design of a nut is

Outside diameter
Height
Inside diameter
Pitch diameter

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