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NHPC-JE’21 CE: Daily Practices Quiz. 25-Oct-2021

Know your strengths and practice your concepts with this quiz on NHPC JE Recruitment 2021. This quiz for NHPC JE Recruitment 2021 is designed specially according to NHPC Syllabus 2021.

Quiz: Civil Engineering
Exam: NHPC-JE
Topic: Miscellaneous

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

Q1. The minimum edge and end distance from the centre of any hole to the nearest flame-cut edge shall not be less than
(a) 1.5 times hole diameter
(b) 1.7 times hole diameter
(c) 2 times hole diameter
(d) 1.5 times bolt/rivet diameter

Q2. Calculate the number of bricks in 20 cubic meters brick works.
(a) 500
(b) 1000
(c) 10000
(d) 100000

Q3. At a sewage treatment plant for a flow of 3 m³/sec, the cross-sectional area of grit chamber will be about
(a) 20 m²
(b) 25 m²
(c) 30 m²
(d) 10 m²

Q4. The difference between face left and face right observation of a theodolite is 3’. The error is
(a) 3’
(b) 1°30”
(c) 45”
(d) 0’

Q5. The light weight aggregates are obtained from
(a) Volcanic source
(b) Igneous source
(c) Metamorphic source
(d) Sedimentary source

Q6. For a soil deposit having porosity (n) = 33% and specific gravity (G) = 2.60, the critical gradient is:
(a) 1.0
(b) 1.05
(c) 1.07
(d) 1.10

Solutions

S1. Ans.(b)
Sol. According to IS800: 2007 recommendation.
→ minimum value of edge distance = 1.7 × diameter of hole
[In case of sheared or hand flamed out edges]

→ minimum edge and end distance shaft not be less than = 1.5 × diameter of hole
[In case of rolled machine flames (cut, sawn and planed edges]

S2. Ans.(c)
Sol. No. of bricks in 1m² = 500
Hence, no. of bricks in 20 m³ bricks work = 20 × 500
=10000 bricks

S3. Ans.(d)
Sol. The horizontal velocity in grit chambers is about 0.3 m/sec.
Cross-sectional area required = Discharge/(Velocity (horizontal))
=3/0.3
= 10 m^2.

S4. Ans.(b)
Sol.
▭(Error=(Difference between face left and face right observation)/2)
Error = (3’)/2
▭(Error=1°30″)

S5. Ans.(a)
Sol. Most of the light weight aggregates are obtained from volcanic source.
Ex. Basalt, blast furnace slag, natural pumice etc.

S6. Ans.(c)
Sol. Given, Porosity (n) = 33%
Specific gravity (G) = 2.60
Critical hydraulic gradient (I_C ) = ?
▭(I_C=(G-1)/(1+e))
e=n/(1-n)=0.33/(1-0.33)=0.49
I_C=(2.6-1)/(1+0.49)
▭(I_C=1.073 )

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