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DFCCIL’21 CE: Daily Practice Quiz. 13-August-2021

Quiz: Civil Engineering
Exam: DFCCIL-JE
Topic: MISCELLANEOUS

Each question carries 1 mark
Negative marking: 1/4 mark
Time: 8 Minutes

Q1. Which of the following sections will have large shape factor?
(a) Triangle
(b) Rectangle
(c) I-section
(d) Solid circular section

Q2. The effective length of a column, held in position and restrained in direction at one end and the other end is free, is equal to:
(a) 0.67 L
(b) L
(c) 1.2 L
(d) 2.00 L

Q3. The permissible bending stress in the slab base of steel columns for all grades of steel is limited to:
(a) 185 N/mm²
(b) 165 N/mm²
(c) 175 N/mm²
(d) 200 N/mm²

 

Q4. The minimum thickness of a flat slab shall be
(a) 200 mm
(b) 100 mm
(c) 150 mm
(d) 125 mm

Q5. Bleeding of concrete leads to which of the following?
1. Drying up of concrete surface
2. Formation of pores inside
3. Segregation of aggregate
4. Decrease in strength.
Select the correct answer using the codes given below:
(a) 1 only
(b) 1 and 2
(c) 1 and 3
(d) 2 and 4

Q6. A 16 N force produce a moment of 64 Nm. The moment arm is
(a) 2 m
(b) √2 m
(c) 8 m
(d) 4 m

SOLUTION

S1. Ans.(a)
Sol.
Shape Shape factor
Diamond 2.0
Solid circular     1.697 -1.70
Rectangle     1.50
Hollow circular     1.27
I – section      1.12-1.14
Triangle       2.34

S2. Ans.(d)
Sol. The effective length of a column, held in position and restrained in direction at one end and the other end is free, is equal to 2L.

DFCCIL'21 CE: Daily Practice Quiz. 13-August-2021 |_30.1

S3. Ans.(a)
Sol. As per IS, The permissible bending stress in the slab base of steel columns for all grades of steel is limited to 185 N/mm².

S4. Ans. (d)
Sol. As per IS 456: 2000 clause 31.2.1, The minimum thickness of a flat slab shall be 125mm.

S5. Ans. (d)
Sol. Bleeding in fresh concrete refers to the process where free water in the mix is pushed upward to the surface due to the settlement of heavier solid particles such as cement and water. Some bleeding is normal but excessive bleeding can be problematic. A higher ratio can lead to excessive bleeding. It causes:
(1) Higher shrinkage cracks at top surface
(2) Water roads and reduction of bond Beth the aggregates and cement paste.
S6. Ans.(d)
Sol. moment = force × perpendicular distance
= force × arm distance
64 = 16 × L
L = 4 m

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