# Design of RC Structures Questions and Answers – Doubly Reinforced Beams – Analysis of Concrete Sections

This set of Design of RC Structures Multiple Choice Questions & Answers (MCQs) focuses on “Doubly Reinforced Beams – Analysis of Concrete Sections”.

1. Which Test is done for quality control of Portland cement?
a) Setting Time
b) Soundness
c) Tensile Strength
d) Fire Resistant

Explanation: A paste of cement is prepared and is leaved to set. Its time is analyzed and the test is performed.

2. At what temperature does raw material of cement is burned for production?
a) 1000°C
b) 1200°C
c) 1500°C
d) 2000°C

Explanation: Raw material of cement is burned in kiln at very high temperature of about 1100-1250°C.

3. How is the workability of concrete increased?

Explanation: Admixture helps the concrete to become pumpable or more workable without increasing the amount of water.

4. What is the basic material used for manufacturing of cement?
a) Stone
b) Sand
c) Gypsum
d) Granite

Explanation: The basic materials for the manufacturing of the cement are Lime and Gypsum.

5. What is the size of vicat needle used for cement testing?
a) 10mm Dia
b) 1mm Square
c) 3mm Square
d) 15 mm Dia

Explanation: Vicat’s apparatus consists of an arrangement to hold the plunger of 10 mm diameter and two other needles which are made to freely fall into a mould filled with the cement paste and the amount of penetration of the needles of plunder can be noted using the vertical graduations from 0 mm to 50 mm.

6. What is determined by vicat test?
a) Fineness Test
b) Tensile Strength Test
c) Setting Time Test
d) Compressive Strength Test

Explanation: Vicat Test is used to find out the consistency, initial setting time and final setting time of the cement. In the normal consistency test we have to find out the amount of water to be added to the cement to form a cement paste of normal consistency.

7. What is the size of fine aggregate?
a) 20-15mm
b) 15-10mm
c) 10-4.75mm
d) Below 4.75mm

Explanation: The size of coarse aggregate is more than 4.75mm and the size of fine aggregate is below 4.75mm.

8. 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.

9. What is the composition of lime in OPC?
a) 40-50%
b) 50-60%
c) 60-70%
d) 70-80%

Explanation: Lime is add in the composition of ordinary Portland cement in the form of limestone or calcium carbonate of about 67% ± 3%.

10. In M20 concrete M refers to ____
a) Minimum
b) Maximum
c) Mix proportion
d) Moment

Explanation: M in M20 grade concrete refers to mixed proportion and 20 means that its strength will be at least 20N/mm2 after 28 days of casting.

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