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Machine Design

Machine Design
In order to have smooth operation, the minimum number of teeth on the smaller sprocket, for moderate speeds, should be

15
21
17
25

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Machine Design
In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set in order to

Reduce vibration
Ensure proper alignment
Reduce slip
Ensure uniform loading

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Machine Design
A plate with an elliptical hole in the centre, with semi-major axis (a) perpendicular to the direction of loading and semi-minor axis (b) along the direction of loading, is subjected to a pull P. The maximum stress induced at the edge of the hole is equal to (where σ = Stress for a plate with no hole i.e. nominal stress)

σ [1 + (2a/b)]
σ [1 + (3a/b)]
σ [1 + (b/2a)]
σ [1 + (b/3a)]

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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

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

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Machine Design
When the belt is transmitting maximum power, the belt speed should be (Where, m = mass of belt per meter (kg/m) and Pmax = maximum permissible tension in belt (N))

√(Pmax / m)
√(Pmax / 2m)
√(3m /Pmax)
√(Pmax / 3m)

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Machine Design
For a shaft diameter of 100 mm, the number of bolts in a flange coupling should be

8
10
4
6

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