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NHPC-JE’21 CE: Daily Practices Quiz. 14-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. A clay layer of thickness 10 cm and initial void ratio 0.5 undergoes settlement that final void ratio is 0.2, the settlement of the layer in cm is:
(a) 1
(b) 1.5
(c) 2
(d) 2.5

Q2. A water treatment plant treats 6000 m³ of water per day. If it consumes 20 kg chlorine per day, then the chlorine dosage would be
(a) 3.00 mg/l
(b) 3.75 mg/l
(c) 4.25 mg/l
(d) 3.33 mg/l

Q3. For points and crossings, maximum size of ballast is
(a) 50 mm
(b) 40 mm
(c) 25 mm
(d) none of these

Q4. In a Sutro weir, the discharge is proportional to
(a) H^(1/2)
(b) H^(3/2)
(c) H^(5/2)
(d) H^

Q5. The detention period of a septic tank is of the order of
(a) 2-6 hours
(b) 2-4 hours
(c) 12-36 hours
(d) 4-8 hours

Q6. As per IS:800-1984, what is the axial tension for mild steel power driven rivets?
(a) 100 Mpa
(b) 250 Mpa
(c) 415 Mpa
(d) 1000 Mpa

Solutions

S1. Ans.(c)
Sol. H=10 cm
e_1=0.5
e_2=0.2
∆ H=?
∆H/H=∆e/(1+e)
∆H/10=((0.5-0.2))/(1+0.5)
▭(∆H=2 cm)

S2. Ans.(d)
Sol. Quantity of water treated per day = 6000 m³
Quantity of chlorine consumed per day = 20 kg.
Chlorine dosage = (Consumed chlorine per day)/(Quantity of water treated per day)
= (20×10^6 mg.)/(6000× 10^3 l.)
= 3.33 mg/l.

S3. Ans.(c)
Sol.

Type of Sleepers Size of ballast
Wooden & cost Iron sleepers

CST-9 & Through sleepers

Points & Crossing

50 mm

40 mm

25 mm

S4. Ans. (d)
Sol. Relation for discharge over weir

Q ∝ H^n

n = 3/2 for Reatangular weir
n = 5/2 for triangular weir
n = 1 for Proportional or Sutro weir

S5. Ans.(c)
Sol. The detention period of septic tank is 12 to 36 hours.

S6. Ans.(a)
Sol. Maximum permissible stress.

  Axial tension Shearing Bearing
Power driven Shop rivet 100 100 300
Hand driver shop rivet 80 80 250

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