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Machine Design

Machine Design
The standard length of the shaft is

7 m
All of these
6 m
5 m

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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

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

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Machine Design
A screw is said to be a self locking screw, if its efficiency is

Less than 50%
Equal to 50%
None of these
More than 50%

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

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Machine Design
The design of shafts made of brittle materials is based on

St Venant's theory
Rankine's theory
Guest's theory
Von Mises theory

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Machine Design
The centrifugal tension in belts

Increases the belt tension without increasing power transmission
Increase the wrap angle
Decreases the power transmitted
Increases the power transmitted

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