NHPC-JE'21 CE: Daily Practices Quiz. 15-Sep-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 limit state of serviceability of a steel structure includes all of the following except.
(a) Corrosion
(b) Crack due to fatigue
(c) Fire
(d) Fracture due to fatigue

Q2. Which of the following processes takes place in trickling filters?
(a) Filtration
(b) Oxidation
(c) Disinfection
(d) Biological action

Q3. Reduction in volume of soil primarily due to squeezing out of water from the voids is called:
(a) Primary consolidation
(b) Plastic flow
(c) Creep
(d) Secondary consolidation

Q4. What is the first step for the approval of work?
(a) Appropriation
(b) Technical sanction
(c) Administrative approval
(d) Expenditure approval

Q5. What will be the seepage velocity of soil having discharge velocity of 5×10^(-7) m/s and a void ratio of 0.50?
(a) 15×10^(-7) m\/sec
(b) 30×10^(-7) m\/sec
(c) 20×10^(-7) m\/sec
(d) 10×10^(-7) m\/sec

Q6. A cantilever beam is deflected by due to load P if load is doubled, then deflection compared to earlier case will be changed by a factor of:
(a) 2
(b) 1/2
(c) 1/8
(d) 8

Solutions

S1. Ans.(d)
Sol. Limit state of serviceability
(i) Deflection
(ii) Cracking
(iii) Fire
(iv) Corrosion
(v) Vibration

S2. Ans.(d)
Sol. Trickling filter is attached aerobic growth system and biological process takes places in trickling filters.

S3. Ans.(a)
Sol. Primary consolidation – Due to expulsion of pore water.
Secondary consolidation – Due to plastic rearrangement of soil solid.

S4. Ans.(c)
Sol. There are various steps for the approval of work before construction-
1. Administrative approval
2. Expenditure sanction
3. Technical sanction
4. Appropriation of fund
5. Reappropriation of fund
6. Laps of sanction.

S5. Ans.(a)
Sol. Discharge velocity (V)=5×10^(-7) m\/sec
Void ratio (e)=0.50
Porosity (n)=e/(1+e)=0.5/1.5=0.33
Seepage velocity (V_s )=V/n
=(5×10^(-7))/0.33
=15×10^(-7) m\/sec

S6. Ans.(a)
Sol. Deflection when cantilever beam is subjected to load P
δ_1=(PL^3)/3EI
Deflection, when load is doubled,
δ_2=((2P) L^3)/3EI
δ_2=2δ_1