Machine Design
A shaft coupling should

Hold the shafts in perfect alignment
Transmit full power of the shaft
All of these
Be easy to connect or disconnect

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Machine Design
Which is correct statement? Stress concentration in cyclic loading is

Seriousness would depend on other factors
Very serious in brittle materials and less serious in ductile materials
Very serious in ductile materials and less serious in brittle materials
Equally serious in both types of materials

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