Machine Design
In a belt drive, if the pulley diameter is doubled keeping the tension and belt width constant, then it will be necessary to

Increase the key width
Decrease the key length
Increase the key length
Increase the key depth

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Machine Design
When a machine member is subjected to torsion, the torsional shear stress set up in the member is

Zero at the centroidal axis and maximum at the outer surface of the member
Maximum at the centroidal axis and zero at the outer surface of the member
Maximum at both the centroidal axis and outer surface of the member
Zero at both the centroidal axis and outer surface of the member

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

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

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