Online Quiz on RCC Structure Design - Set 05 - ObjectiveBooks

# Practice Test: Question Set - 05

1. A pre-stressed rectangular beam which carries two concentrated loads W at L/3 from either end, is provided with a bent tendon with tension P such that central one-third portion of the tendon remains parallel to the longitudinal axis, the maximum dip h is
(A) WL/P
(B) WL/2P
(C) WL/3P
(D) WL/4P

2. The minimum head room over a stair must be
(A) 200 cm
(B) 205 cm
(C) 210 cm
(D) 230 cm

3. If is the punching shear resistance per unit area a, is the side of a square footing for a column of side b, carrying a weight W including the weight of the footing, the depth (D) of the footing from punching shear consideration, is
(A) D = W (a - b)/4a²bq
(B) D = W (a² - b²)/4a²bq
(C) D = W (a² - b²)/8a²bq
(D) D = W (a² - b²)/4abq

4. For initial estimate for a beam design, the width is assumed
(A) 1/15th of span
(B) 1/20th of span
(C) 1/25th of span
(D) 1/30th of span

5. In a slab, the pitch of the main reinforcement should not exceed its effective depth
(A) Three times
(B) Four times
(C) Five times
(D) Two times

6. If the length of a combined footing for two columns l meters apart is L and the projection on the left side of the exterior column is x, then the projection y on the right side of the exterior column, in order to have a uniformly distributed load, is (where x̅ is the distance of centre of gravity of column loads).
(A) y = L - (l - x̅)
(B) y = L/2 + (l - x̅)
(C) y = L/2 - (l + x̅)
(D) y = L/2 - (l - x̅)

7. Total pressure on the vertical face of a retaining wall of height h acts parallel to free surface and from the base at a distance of
(A) h/4
(B) h/3
(C) h/2
(D) 2h/3

8. If the tendon is placed at an eccentricity e below the centroidal axis of the longitudinal axis of a rectangular beam (sectional modulus Z and stressed load P in tendon) the stress at the extreme top edge
(A) Is increased by PZ/e
(B) Is increased by Pe/Z
(C) Is decreased by Pe/Z
(D) Remains unchanged

9. The Young's modulus of elasticity of steel, is
(A) 150 KN/mm2
(B) 200 KN/mm2
(C) 250 KN/mm2
(D) 275 KN/mm2

10. Design of a two way slab simply supported on edges and having no provision to prevent the corners from lifting, is made by
(A) Rankine formula
(B) Marcus formula
(C) Rankine Grashoff formula
(D) Grashoff formula

11. Spacing of stirrups in a rectangular beam, is
(A) Kept constant throughout the length
(B) Decreased towards the centre of the beam
(C) Increased at the ends
(D) Increased at the centre of the beam

12. As per IS : 456, the reinforcement in a column should not be less than
(A) 0.5% and not more than 5% of cross-sectional area
(B) 0.6% and not more than 6% of cross-sectional area
(C) 0.7% and not more than 7% of cross-sectional area
(D) 0.8% and not more than 8% of cross-sectional area

13. Bottom bars under the columns are extended into the interior of the footing slab to a distance greater than
(A) 42 diameters from the centre of the column
(B) 42 diameters from the inner edge of the column
(C) 42 diameters from the outer edge of the column
(D) 24 diameters from the centre of the column

14. The allowable tensile stress in mild steel stirrups, reinforced cement concrete, is
(A) 1400 kg/cm2
(B) 190 kg/cm2
(C) 260 kg/cm2
(D) 230 kg/cm2

15. Pick up the assumption for the design of a pre-stressed concrete member from the following:
(A) A transverse plane section remains a plane after bending
(B) During deformation limits, Hook's law is equally applicable to concrete as well as to steel
(C) Variation of stress in reinforcement due to changes in external loading is negligible
(D) All the above

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