HEREDITY
BACKCROSS OR TESTCROSS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Class 1
|
|
|
Class 2
|
|
|
Class 3
|
|
|
Class 4
|
Detailed explanation-1: -Cross sections, in which the extreme fiber in compression can reach yield stress (assuming an elastic distribution of stress), but cannot develop the plastic moment of resistance due to local buckling are referred to as semi-compact sections.
Detailed explanation-2: -Among all these sections Plastic, Compact and semi-compact can be used as compression member but slender section cannot be used as compression member because member fails by buckling before reaching its yield strength.
Detailed explanation-3: -Semi-compact– Cross sections, in which the extreme fiber in compression can reach yield stress but cannot develop the plastic moment of resistance due to local buckling are called semi-compact or non-compact sections.
Detailed explanation-4: -Explanation: Slender or class IV sections are cross section in which local buckling occurs even before the yield stress is attained in one or more parts of the cross section.
Detailed explanation-5: -For steel structures, sections which can form a plastic hinge with the rotation capacity required for plastic global analysis, are designated Class 1 cross-sections.