NHPC-JE'21 CE: Daily Practices Quiz. 17-Dec-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. Coefficient of permeability of soil varies approximately as
(a) D_10^2
(b) √(D_10 )
(c) D_10^3
(d) D_10^(3\/2)

Q2. The thin wall cylindrical vessel has the wall thickness t and diameter d is subjected to the gauge pressure of p. if the diameter of the vessel is doubled, then what is the ratio of hoop stress as compared to initial value?
(a) 1: 1
(b) 2: 1
(c) 1: 2
(d) 1: 4

Q3. The type of aggregates not suitable for high strength concrete and for pavements subjected to tension is
(a) Round aggregates
(b) Irregular aggregates
(c) Angular aggregates
(d) Flaky aggregates

Q4. At a hydraulic jump, the depths at the two sides are 0.4 m and 1.4 m. The head loss in the jump is nearly?
(a) 1.0 m
(a) 0.9 m
(c) 0.7 m
(d) 0.45 m

Q5. Which of the following conditions is correct for the shafts connected in series to each other?
(a) θ= θ_1- θ_2
(b) T=T_1-T_2
(c) θ_1= θ_2
(d) T_1=T_2

Q6. The nominal shear stress (τ_v) in a reinforced concrete beam is given by
(a) bd/V_u
(b) V_u/(bd )
(c) V_u bd
(d) (V_u.b)/d

Solutions

S1. Ans.(a)
Sol. ▭(Coefficient of permeability (K)=100 D_10^2 )
▭(KαD_10^2 )

S2. Ans.(b)
Sol.
σ_h1=pd/2t
σ_h2=P(2d)/2t
σ_h1/σ_h2 =(P(2d)\/2t)/(pd\/2t)=2/1
σ_h1:σ_h2=2∶1

S3. Ans.(a)
Sol. Rounded aggregates have poor interlocking bond hence they are not suitable for high strength concrete and pavements subjected to tension.

S4. Ans.(d)
Sol. Given, conjugate depths y_1=0.4 m.
y_2=1.4 m.
E_L= ?
E_L=(y_2-y_1 )^3/(4y_1 y_2 )
=(1.4-0.4)^3/(4×1.4×0.4)
▭(E_L=0.446≈0.45m)

S5. Ans.(d)
Sol. Shafts connected in series to each other having the same torque at each section and sum of twist at the end of section.
θ= θ_1+ θ_2
T=T_1=T_2

S6. Ans.(b)
Sol. Nominal Shear Stress (τ_v )=V/bd
V→Shear force
bd→Cross sectional area.