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 q 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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