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DFCCIL’21 CE: Daily Practice Quiz. 25-August-2021

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

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

Q1. For single riveted joints, the expected efficiency of the steel pipe joints is approximately:
(a) 0.47
(b) 0.63
(c) 0.75
(d) 0.9

Q2. The maximum center or center distance between rivets in a tension member of thickness 10 mm is
(a) 200 mm
(b) 160 mm
(c) 120 mm
(d) 100 mm

Q3. A riveted joint can fail due to:
(a) Tearing of plate only
(b) Shearing of rivet only
(c) Bearing of plate or rivet only
(d) Any of the above

Q4. The compression flange should be prevented from
(a) buckling
(b) bearing stress
(c) Deflection
(d) bending moment

Q5. For a steel column, the permissible stress in axial compression depends mainly on
(a) effective length
(b) sectional area
(c) radius of gyration
(d) slenderness ratio

Q6. Water emerges from an ogee spillway with velocity = 13.72 m/s and depth = 0.3 m at its toe. The tail water depth required to from a hydraulic jump at the toe is
(a) 6.48 m
(b) 5.24 m
(c) 3.24 m
(d) 2.24 m

SOLUTION

S1. Ans.(b)
Sol. if efficiency of joint is calculated for min^m pitch then efficiency is 60%.

S2. Ans.(b)
Sol. thickness = 10 mm
Maximum centre to centre distance in tension member
= (16t,200)_min.
=(16×10,200)_min.
=(160,200)_min.
= 160 mm

S3. Ans.(d)
Sol. failure of riveted connection-
Shear failure of rivet
Bearing failure of rivet
Tearing failure of plate

S4. Ans.(a)
Sol. compression flange should eb prevented from buckling.

S5. Ans.(d)
Sol. for steel column, the permissible stress in axial compression depends mainly on slenderness ratio
S6. Ans.(c)
Sol. Water depth required to form a hydraulic Jump
Y_2=(Y₁)/2 [-1+√(1+(8V₁²)/(gy₁))]
=0.3/2×[-1+√(1+(8×(13.72)²)/(9.81×0.3))]
= 3.24 m.

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