Design of RC Structures Questions and Answers – Reinforcement – Joining Overlapping

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

1. What is the width of the beam estimated?
a) 1/20 of the span
b) 1/15 of the span
c) 1/10 of the span
d) 1/30 of the span

Explanation: The width of the beam is estimated as 1/20th of the span length to bear the perfect loading.

2. When is the toothing method in the walls used?
a) When the walls are extended
b) When the walls are shorter
c) When the walls are higher
d) When the walls are terminated

Explanation: Toothing method is used when the walls are extended from the actual size so that failure does not occur.

3. What is the formula for equivalent area of concrete?
a) Ac+mAs
b) As+mAc
c) As+Ac
d) Ac-mAs

Explanation: Equivalent area of concrete = Ao = Actual Concrete area + m * Steel area
Since m is the modular ratio between Steel and Concrete.

4. Which of the following are the most favorable construction materials in the following?
a) Timber and Concrete
b) Concrete and Steel
c) Timber and Steel
d) Sand and Cement

Explanation: The combination of Concrete and Steel results in the structure which is both safe and economic.

5. The neutral axis is the ______ axis of the equivalent section.
a) Centroidal
b) Positive
c) Negative
d) Equal area

Explanation: In the case of composite section, the neutral axis is the centroidal axis of the equivalent or transformed section of one material only.

6. What is the major role of aggregate in concrete?
a) It provides strength to the concrete
b) It is the basic component for volume of concrete
c) It acts as binding material
d) It reduces cost

Explanation: Aggregate is the basic component which is used to increase volume of concrete or else concrete will require a high amount of cement.

7. Plane sections transverse to the centre line of a member before bending remains plane after bending.
a) True
b) False

Explanation: For designing a singly reinforced beam, an assumption is made which states that, plane sections transverse to the centre line of a member before bending remains plane after bending.

8. What is the line of intersection of neutral layer with the beam section called?
a) Neutral Axis
b) Horizontal Axis
c) Vertical Axis
d) Centroidal Axis

Explanation: Neutral Axis is the straight line dividing the crossection between tension and compression zone.

9. Zero lever arm must exist in the case of reinforced beams.
a) True
b) False

Explanation: There are separate tension and compression zones therefore zero lever arm does not exist in the case of reinforced beams.

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