# Design of RC Structures Questions and Answers – Two Way Slabs

This set of Design of RC Structures Multiple Choice Questions & Answers (MCQs) focuses on “Two Way Slabs”.

1. Which of the following is the two way slab?
a) 3m*5m
b) 3m*6m
c) 4m*8m
d) 3m*8m

Explanation: ly/lx < 2 for the two way slab.
Hence 5/3=1.67 < 2. According to the criteria this is the two way slab.

2. Two-way flat plate is recommended for earthquake zones.
a) True
b) False

Explanation: The two-way flat plates have a low shear resistance and low stiffness to resist deflection. Therefore, they are not recommended in earthquake zones.

3. Which of the following is not an example of two-way slab?
a) Flat plates
b) Waffle slabs
c) Flat slabs
d) Chajja slab

Explanation: The chajja slab is an example of one-way slab. Remaining flat plates, flat slabs, waffle slabs are example of two-way slab.

4. In how many directions the crank is provided in a two-way slab?
a) 1
b) 2
c) 3
d) 4

Explanation: As in the two way slab the moment is considered in both the direction, the crank is provided in 4 directions as well. In one way slab for single direction of load calculation the crank is provided in two directions.

5. Two-way slab needs more steel than one-way slab.
a) False
b) True

Explanation: For a two-way slab the reinforcement is given in both the directions. Therefore, the steel requirement is more than the one-way slab which is subjected to reinforcement in one direction.

6. What is the thickness of a slab for 1 hour fire rating?
a) 76.4mm
b) 86.4mm
c) 96mm
d) 100mm

Explanation: Exposure to 1 hour to a temperature rise of 121.1°C a 76.2mm thick slab is given. For 2 hour fire rating 127mm thick slab and for 3 hour fire rating 152.4mm is provided.

7. The slab which is directly connected with the column is called __________
a) flat slabs
b) flat plates
c) waffle slab

Explanation: The slab which is directly connected with column is called flat slabs. This is a kind of two-way flat slab which has a higher load carrying capacity.

8. For a slab 360 mm2 of reinforcement is given at midspan. What is the area of the reinforcement that should be extended to the support?
a) 360 mm2
b) 180 mm2
c) 160 mm2
d) 260 mm2

Explanation: The area of the reinforcement that should be extended to the support is 50% of the reinforcement of the reinforcement given in the midspan. The figure is calculated as .5*360 mm2 = 180 mm2.

9. The manual analysis method of two-way slab is direct design method.
a) True
b) False

Explanation: The manual analysis method of two-way slab is direct design method. The other methods are equivalent frame method, yield line method, moment co-efficient method, Marcus method etc.

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