Quiz: Civil Engineering
Each question carries 1 mark
Negative marking: 1/4 mark
Time: 8 Minutes
Q1. For a given elastic material, the elastic modules E is 210 GPa and its Poisson’s Ratio is 0.27. What is the approximate value of its modules of rigidity?
(a) 105 GPa
(b) 83 GPa
(c) 159 GPa
(d) 165 GPa
Q2. The purpose of stiffeners in a plate girder is to:
(a) Take care of bearing stress
(b) Increase the moment carrying capacity of the girder
(c) Prevent buckling of web plate
(d) Reduce the shear stress
Q3. The magnetic bearing of a line is S 28° 20’E. If the declination is 7°30’ west, the time bearing will be
(a) S 20° 50’ E
(b) S 35° 50’ E
(c) E 20° 50’ S
(d) E 35° 55’ S
Q4. The nail diameter should not be more than (t = least thickness of the wooden member to be connected)
Q5. The value, which allows the flow only in one direction, is a
(a) Reflux valve
(b) Sluice valve
(c) Gate valve
(d) None of these
Q6. As per IS : 800 in case of webs stiffened both vertically and horizontally, the minimum thickness of web should not be less than
Sol. Given, Elastic modulus (E) = 210 GPa
Poison ratio (μ) = 0.27
Modulus of rigidity (G) =?
E = 2G(1+μ)
▭(G=82.67 GPa≈83 GPa)
Sol. Stiffeners are typically plate welded to the web. These plates increase the moment of inertia of plate girder which enhance the rigidity in turns it prevent buckling of web plate. To increase the moment carrying capacity of the girder, we provide the cover plates on flange.
Time hearing of AB = MB of AB + Declination
= 28°20’ + 7°30’
= S 35°50’ E
Sol. The nail diameter should not be more than t/6.
t = least thickness of the wooden member to be connected.
Sol. Check or reflux or non -returning valves are allows the flow only in one direction they do not permit the back flow of water when pump is stop.
Sol. As per IS:800, If webs stiffened both vertically and horizontally, then minimum thickness of web should not be less than d/250.