Virtual Labs

a: By checking if the individual strains are within a range of ±20 percent of their mean value at σb, at the first preloading cycle b: By checking if the individual strains are within a range of ±20 percent of their mean value at σa, at the first preloading cycle c: By checking if the individual strains are within a range of ±20 percent of their mean value at σa, at the last loading cycle d: Not necessary to check centering of the specimen.

4. On a concrete specimen of cylindrical compressive strength 27 MPa, longitudinal strains at basic and upper loading stress are 0.0001 and 0.0003. static modulus of elasticity will be

a: 27000 MPa b: 90000 MPa c: 30000 MPa d: 135000 MPa

5. What is the constant laoding and unloading rate in the experiment

a: 0.2 N/mm2/s to 0.3 N/mm2/s b: 0.2 N/mm2/min to 0.3 N/mm2/min c: 14 N/mm2/min to 15 N/mm2/min d: 0.5 N/mm2/s to 0.6 N/mm2/s

6. How many loading cycles are performed in this experiment

a: 3 b: 4 c: 5 d: 2

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