A stepped circular shaft is fixed at A and C as shown in the figure below. The diameter of the shaft along BC is twice as that of along AB. The torsional rigidity of ABis GJ. The torque required for unit twist at B is C B. A 2GJ (a) 5GJ (b) 9GJ (c) 17GJ (d)

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Crack Detection

Concrete materials are meant for supporting structures, building foundations and they act as several load-bearing structures. Over time, due to environmental conditions, and based on the constituent materials used, concrete materials are subjected to a great degree of distress. Corrosion of the reinforcement bars due to chemical influences, uneven base, earthquake, drying shrinkages, and alkali-aggregate reactions are some of the reasons for concrete distress.