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DFCCIL’21 CE: Daily Practice Quiz. 23-August-2021

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

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

Q1. Consider the following statements:
1. Coefficient of consolidation normally increases with decreasing liquid limit of clay.
2. The larger the value of coefficient of consolidation, the longer it takes for full consolidation to occur.
Which of these statements is/are correct?
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2

Q2. Consider the following statements regarding refractory bricks in furnaces.
silica content in the soil should be less than 40%
the furnace is fired at temperatures more than 1700°C
chrome bricks are known as basic bricks
water absorption of bricks should not exceed 10%
which of the above statement are correct?
(a) 1 and 2 only
(b) 2 and 4 only
(c) 3 and 4 only
(d) 1 and 3 only

Q3. Which of the following statements are correct?
All load carrying members transmit load through basic modes of tension, compression, torsion, and shear only.
Beams carry transverse load.
Combined loading is a complicated loading.
Nature of internal forces decide the aspect of combined loading
(a) 1 and 2
(b) 2 and 3
(c) 3 and 4
(d) 2 and 4

Q4. Pick up the correct statement from the followings
(a) The eyepiece plays no part in defining the line of sight
(b) The diaphragm plays no part in defining the line of sight
(c) The optical center of the objective plays no part in defining the line of sight.
(d) None of the above.

Q5. A self-cleansing velocity may be defined as that velocity at which the solid particles will:
(a) Settle at the bottom of the sewer
(b) Remain in suspension, without settling at the bottom of the sewer
(c) Wash out from the sewer
(d) Cause damage to the sewer

Q6. A pipe which carries discharge from water closet is called as………
(a) Soil pipe
(b) drain
(c) sewer
(d) waste pipe

SOLUTION

S1. Ans.(a)
Sol. From Taylor’s formula, we have, T_V=(C_V t)/d²
For full consolidation i.e. U = 100%. T_V will more or less be a constant.
∴ C_V t= constant
⇒ C_V∝1/t
Thus, larger the value of coefficient of consolidation, smaller it takes for full consolidation to occur.
S2. Ans.(b)
Sol. Composition of refractory bricks are as given bellow:
Components Percentage
Silica—————– 62-95
Alumina ——————-3-35
Lime, magnesia,Iron oxide and alkalies————- 2–6

S3. Ans.(a)
Sol. Combined loading means there is contribution of one or more loads at a point of state of stress. It is not a complicated case of loading.

S4. Ans.(a)
Sol. Diaphragm, optical centre are part of the telescope and those are very important to observe the line of sight. Line of sight is the line passing through the cross hair and optical center of objective lens. However Eyepiece only clarifies the cross hair in diaphragm. Thus Eye piece plays no important role in defining the line of sight.
S5. Ans.(b)
Sol. A self-cleansing velocity may be defined as that velocity at which the solid particles will remain in suspension, without settling at the bottom of the sewer.

S6. Ans.(a)
Sol. Soil pipe carries discharge from water closet. The diameter of soil pipe should not be less than 80 mm.

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