Design of Beams MCQ with answer and solution

Concept

Definition of filler joists in concrete

Formula

NONE

Step-by-step solution

1. Light rolled steel joists embedded in plain cement concrete slab are used in composite floor construction. 2. These small rolled steel sections fully encased in concrete act together with concrete as composite beams known as filler joists. 3. Therefore, light sections placed in plain cement concrete are called filler joists. Answer: C

Explanation

Filler joists are light rolled steel I-sections embedded within a plain cement concrete slab. The surrounding concrete fills the spaces around the steel members to form a solid composite floor slab system. Therefore, option C is the correct term for light steel beam sections placed in plain cement concrete.

Why the other options are wrong

A) Joists refer generally to horizontal beam members that support floor or ceiling loads without embedding in concrete. B) Simple joists are standalone steel beams without plain cement concrete encasement. D) Concrete joists are precast or cast-in-place concrete beams rather than light steel sections.

Shortcut

Filler joists = Steel sections embedded in concrete slabs.

Common mistake

Confusing filler joists with simple joists or prefabricated concrete joists.