Bridge Engineering MCQ with answer and solution

Concept

IRC Class AA loading is used within municipal limits, on important roads and on highways.

Step-by-step solution

1. IRC has Class AA, Class 70R, Class A and Class B loadings. 2. Class AA (tracked or wheeled) is used within municipal limits. 3. It is also used on National Highways, State Highways and bridges near ports and industrial areas. 4. So the answer is Class AA.

Explanation

IRC Class AA loading is adopted within municipal limits and on important roads. Class 70R is the other heavy loading, used on highways. Class A is the normal loading for all other roads.

Why the other options are wrong

A: Class A is for general roads and is also checked with other loads, not the special rule for municipal limits. C: Class 70R is used on highways and is not the municipal-limit loading. D: Class B is for temporary or less important bridges.

Shortcut

Municipal limits = Class AA.

Common mistake

Choosing Class 70R because it is also a heavy loading.