Deck 2: Civil Engineering Design and Analysis

Question 1

If is the load on a circular slab of radius , the maximum radial moment at the centre of the slab, is

A)WR²/16
B)2WR²/16
C)3WR²/16
D)5WR²/16

Answer 1

3WR²/16

Question 2

If A is the area of the foundation of a retaining wall carrying a load W and retaining earth of weight w per unit volume, the minimum depth (h) of the foundation from the free surface of the earth, is

A)h = (W/Aw)[(1 - )/(1 + sin )]
B)h = (W/Aw) [(1 + )/(1 + sin )]
C)h = (W/Aw) [(1 - )/(1 + sin )]²
D)h W/Aw) [(1 - )/(1 + sin )]²

Answer 2

h = (W/Aw) [(1 - )/(1 + sin )]²

Question 3

If the permissible compressive and tensile stresses in a singly reinforced beam are 50 kg/cm² and 1400 kg/cm² respectively and the modular ratio is 18, the percentage area At of the steel required for an economic section, is

A)0.496%
B)0.596 %
C)0.696 %
D)0.796%

Answer 3

0.696 %

Question 4

The modular ratio m of a concrete whose permissible compressive stress is C, may be obtained from the equation.

A)m = 700/3C
B)m = 1400/3C
C)m = 2800/3C
D)m = 3500/3C

Question 5

If is the sectional area of a pre-stressed rectangular beam provided with a tendon pre-stressed by a force through its centroidal longitudinal axis, the compressive stress in concrete, is

A)P/A
B)A/P
C)P/2A
D)2A/P

Question 6

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 his

A)WL/P
B)WL/2P
C)WL/3P
D)WL/4P

Question 7

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

Question 8

For initial estimate for a beam design, the width is assumed

A)1/15^th of span
B)1/20^th of span
C)1/25^th of span
D)1/30^th of span

Question 9

If the length of a combined footing for two columns l metres 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 is the distance of centre of gravity of column loads).

A)y = L - (l - )
B)y = L/2 + (l - )
C)y = L/2 - (l + )
D)y = L/2 - (l - )

Question 10

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

Question 11

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 byPZ/e
B)Is increased byPe/Z
C)Is decreased by Pe/Z
D)Remainsunchanged

Question 12

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)Grashoffformula

Question 13

Pick up the assumption for the design of a pre-stressed concrete member from the following:

A)A transverse plane section remains a plane afterbending
B)During deformation limits, Hook'slaw is equally applicable to concrete as well asto steel
C)Variation of stress in reinforcement due to changes in external loading is negligible
D)All the above

Question 14

An R.C.C. column is treated as short column if its slenderness ratio is less than

A)30
B)35
C)40
D)50

Question 15

The zone in which transverse bending is likely to occur may be obtained by drawing a line from the

A)30°
B)45°
C)60°
D)None of these

Question 16

If the length of an intermediate span of a continuous slab is 5m, the length of the end span is kept

A)4.5 m
B)4.0 m
C)3.5 m
D)3.0 m

Question 17

If L is the effective span of a R.C.C. beam which is subjected to maximum shear qmax at the ends, the distance from either end over which stirrups for the shear, are provided, is

A)(L/2) (1 - 3/qmax)
B)(L/3) (1 - 5/qmax)
C)(L/2) (1 - 5/qmax)
D)(L/2) (1 - 2/qmax)

Question 18

The angle of internal friction of soil mass is the angle whose

A)Tangent is equal to the rate of the maximum resistance to sliding on any internal inclined plane to the normal pressure acting on theplane
B)Sine is equal to the ratio ofthe maximum resistance to sliding on any internal inclined plane to the normal pressure acting on the plane
C)Cosine is equal to the ratio of themaximum resistance sliding on any internal inclined plane to the normal pressure acting on the plane
D)None of these

Question 19

If T and R are the tread and rise of a stair which carries a load w per square metre on slope, the corresponding load per square metre of the horizontal area, is

A)w (R + T)/T
B)w (R² + T²)/T
C)w (R + T)/T.
D)w (R/T)

Question 20

If the maximum dip of a parabolic tendon carrying tension P is h and the effective length of the pre-stressed beam is L, the upward uniform pressure will be

A)8hp/l
B)8hp/l²
C)8hl/p
D)8hl/p²

Question 21

If the ratio of long and short spans of a two way slab with corners held down is r, the actual reduction of B.M. is given by

A)(5/6) (r/1 + r²) M
B)(5/6) (r²/1 + r²)M
C)(5/6) (r²/1 + r3)M
D)(5/6) (r²/1 + r4) M

Question 22

Total pressure on the vertical face of a retaining wall of height per unit run exerted by the retained earth weighing per unit volume, is

A)wh [(1 - )/(1 + sin )]
B)wh² [(1 - )/(1 + sin )]
C)wh² [(1 - )/2(1 + sin )]
D)wh²[(1 - )/3(1 + sin )]

Question 23

A singly reinforced beam has breadth b, effective depth d, depth of neutral axis n and critical neutral axis n1. If fc and ft are permissible compressive and tensile stresses, the moment to resistance of the beam, is

A)bn (fc/2) (d - n/3)
B)Atft (d - n/3)
C)½ n1 (1 - n1/3) cbd²
D)All the above

Question 24

If l1 and l2 are the lengths of long and short spans of a two way slab simply supported on four edges and carrying a load w per unit area, the ratio of the loads split into w1 and w2acting on strips parallel to l2 and l1 is

A)w1/w2 = l2/l1
B)w1/w2 = (l2/l1)²
C)w1/w2 = (l2/l1)3
D)w1/w2 = (l2/l1)4

Question 25

If Ac, Asc and A are areas of concrete, longitudinal steel and section of a R.C.C. column and m and c are the modular ratio and maximum stress in the configuration of concrete, the strength of column is

A)cAc + m cAsc
B)c(A - Asc) + m cAsc
C)c[A + (m - 1)ASC]
D)All the above

Question 26

If longitudinally spanning stairs are casted along with their landings, the maximum bending moment per metre width, is taken as

A)wl²/4
B)wl²/8
C)wl²/10
D)wl²/12

Question 27

If P kg/m² is the upward pressure on the slab of a plain concrete footing whose projection on either side of the wall is a cm, the depth of foundation D is given by

A)D = 0.00775 a?P
B)D = 0.0775 a?P
C)D = 0.07775 a?P
D)D = 0.775 P?a