# Design of RC Structures Questions and Answers – Reinforcement

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

1. What is the maximum the thickness of reinforced concrete footing on piles at its edges?
a) 10cm
b) 20cm
c) 30cm
d) 40cm

Explanation: According to Code IS:456- 1978, the maximum the thickness of reinforced concrete footing on piles at its edges is 30cm.

2. What should be the maximum height for cantilever retaining wall?
a) 2m
b) 3m
c) 4m
d) 6m

Explanation: The maximum height for cantilever retaining wall is of 6m.

3. What is the maximum area for tension reinforcement in a beam?
a) 2%
b) 4%
c) 6%
d) 8%

Explanation: According to IS:456-2000, the maximum area for tension reinforcement in a beam is 4%.

4. The minimum ph value of water should be ______
a) 4
b) 5
c) 6
d) 7

Explanation: According to IS:456-1978, the minimum ph value of water is 6.

5. Steel beam theory is used for _____
a) Design of simple steel beams
b) Steel beam encased in concrete
c) Beam if shear stress exceeds 4 times
d) Doubly reinforced beams ignoring compressive stress in concrete

Explanation: Steel beam theory is used for doubly reinforced beams ignoring compressive stress in concrete.

6. In what case will lever arm be zero?
a) M = 0
b) M = 1
c) M is positive
d) M is negative

Explanation: Moment = Force * Lever Arm
Lever Arm = Moment/Force
So if M = 0 than Lever Arm = 0

7. In what case will the MR be equal for tension and compression?
a) Total compression = Total tension
b) Compression > Tension
c) Tension > Compression
d) In under reinforced section

Explanation: MR is equal when the section is balanced which is a case of tension = compression

8. Deformed steel bars minimize the _________ in concrete.
a) Slippage
b) Bonding
c) Ribs
d) Lugs

Explanation: Deformed steel bar helps in minimizing the slippage in steel and increases the bonding between two materials.

9. For how much time does a concrete is waited for obtaining its mixed grade?
a) 7 days
b) 15 days
c) 20 days
d) 28 days

Explanation: When the concrete is casted, it is cured for 28 days and then its compressive strength is tested and according to its strength its grade is specified.

10. What types of beams are failed by flexural yielding?
a) Which are laterally shift
b) Which are not laterally supported
c) Beams have much greater strength and stiffness
d) Non-compact sections

Explanation: The beams which are laterally shift are failed by flexural yielding because they don’t have capacity to withstand the load of the structure. The yielding occurs and they don’t have any support on the lateral.

Sanfoundry Global Education & Learning Series – Design of RC Structures

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