To minimize the total cost of a roof truss, the ratio of the cost of truss to the cost of purlins shall be_______________?

Related Mcqs:

1. Normally, the angle of roof truss with asbestos sheets should not be less than_______________?

   A. 26’/2°
   B. 30°
   C. 35°
   D. 40°

2. The live load for a sloping roof with slope 15°, where access is not provided to roof, is taken as_______________?

   A. 0.65 kN/m2
   B. 0.75 kN/m2
   C. 1.35 kN/m2
   D. 1.50 kN/m2

3. Generally the purlins are placed at the panel points so as to avoid__________________?

   A. axial force in rafter
   B. shear force in rafter
   C. deflection of rafter
   D. bending moment in rafter

4. Hudson’s formula gives the dead weight of a truss bridge as a function of_________________?

   A. bottom chord area
   B. top chord area
   C. effective span of bridge
   D. heaviest axle load of engine

5. The portal bracing in a truss bridge is used to_____________________?

   A. transfer load from top of end posts to bearings
   B. keep the rectangular shape of the bridge cross-section
   C. stiffen the structure laterally
   D. prevent the sidesway buckling of top chord

6. The external wind pressure acting on a roof depends on__________________?

   A. degree of permeability of roof
   B. slope of roof
   C. both (A) and (B)
   D. none of the above

7. For the buildings having a low permeability, the internal wind pressure acting normal to the wall and roof surfaces is taken as__________________?

   A. zero
   B. ±0.2p
   C. ± 0.5 p
   D. ±0.7p
   where p is basic wind pressure

8. In case of plastic design, the calculated maximum shear capacity of a beam as per IS:800 shall be________________?

   A. 0.55 Awfy
   B. 0.65 Awfy
   C. 0.75 Awfy
   D. 0.85 Awfy
   where, Aw = effective cross-sectional area resisting shear fy = yield stress of the steel

9. For rivets in tension with counter-sunk heads, the tensile value shall be____________________?

   A. reduced by 25 %
   B. reduced by 33.3%
   C. increased by 25 %
   D. increased by 33.3 %

10. The connection of intermediate vertical stiffeners to the web, not subjected to external loads, shall be designed for a minimum shear force (kN/m) of___________________?

    A. 75 t2/h
    B. 125 t3/h2
    C. 125 t2/h
    D. 175 t2/h

    where, t = the web thickness in mm
    h = the outstand of stiffener in mm