Quiz on Design of Slab

What is a solid slab primarily supported by?

• Load to beam

• Column capital

• Point load

• Drop panel

Answer explanation

A solid slab is primarily supported by load transferred to beams. Beams carry the load from the slab and distribute it to vertical supports, making 'load to beam' the correct choice.

Which type of slab transfers load in one direction?

• Two way slab

• Flat plate slab

• One way slab

• Flat slab

Answer explanation

A one way slab transfers loads primarily in one direction, typically supported on two opposite sides. In contrast, two way slabs distribute loads in two directions, making the one way slab the correct choice for this question.

What is the effective span in the longer direction denoted as?

• Lz

• Ly

• Lx

• Lw

Answer explanation

The effective span in the longer direction is denoted as Ly. This notation is commonly used in structural engineering to represent the length of a beam or structural element in its longer dimension.

What is the maximum diameter of the bar in slab reinforcement?

• One-third of total thickness

• Half the total thickness

• Twice the total thickness

• Equal to total thickness

Answer explanation

The maximum diameter of the bar in slab reinforcement is equal to the total thickness. This ensures adequate strength and stability in the slab, allowing for optimal load distribution.

What is the minimum thickness of a flat slab?

• 100 mm

• 125 mm

• 150 mm

• 200 mm

Answer explanation

The minimum thickness of a flat slab is typically 125 mm, which provides adequate strength and support for structural loads while ensuring durability and performance.

What type of reinforcement is provided in the transverse direction of main reinforcement?

• Main R/F

• Distribution R/F

• Shear R/F

• Temperature R/F

Answer explanation

In reinforced concrete, distribution reinforcement (R/F) is provided in the transverse direction to help distribute loads and control cracking, complementing the main reinforcement which primarily handles tensile forces.

What is the ratio used to determine if a slab is two-way?

• Ly/Lx > 2

• Ly/Lx < 2

• Ly/Lx = 2

• Ly/Lx = 1

Answer explanation

A slab is considered two-way when the ratio Ly/Lx is less than 2. This indicates that the longer span (Ly) is not more than twice the shorter span (Lx), allowing for effective load distribution in both directions.

What is the recommended percentage of MS reinforcement in each direction of the slab?

• 0.10%

• 0.20%

• 0.15%

• 0.12%

Answer explanation

The recommended percentage of MS reinforcement in each direction of the slab is 0.15%. This value ensures adequate strength and durability, making it the correct choice among the options provided.

What is the primary purpose of a drop panel in a flat slab?

• To enhance shear resistance

• To provide aesthetic appeal

• To increase load capacity

• To reduce thickness

Answer explanation

The primary purpose of a drop panel in a flat slab is to enhance shear resistance. By increasing the thickness in critical areas, drop panels help to prevent shear failure, making the structure safer and more stable.

What is the main characteristic of a flat plate slab?

• Has drop panels

• No drop panels or column capitals

• Is circular in shape

• Has column capitals

Answer explanation

A flat plate slab is characterized by having no drop panels or column capitals, which distinguishes it from other slab types that may include these features for added support or aesthetics.