Deck 1: Concrete Design and Construction

Question 1

The maximum ratio of span to depth of a slab simply supported and spanning in one direction, is

A)35
B)25
C)30
D)20

Answer 1

30

Question 2

If the width of the foundation for two equal columns is restricted, the shape of the footing generally adopted, is

A)Square
B)Rectangular
C)Trapezoidal
D)Triangular

Answer 2

Rectangular

Question 3

The floor slab of a building is supported on reinforced cement floor beams. The ratio of the end and intermediate spans is kept

A)0.7
B)0.8
C)0.9
D)0.6

Answer 3

0.9

Question 4

A pre-stressed concrete member is preferred because

A)Its dimensions are not decided from the diagonal tensile stress
B)Large size of long beams carrying large shear force need not be adopted
C)Removal of cracks in the members due toshrinkage
D)All the above

Question 5

If the ratio of the span to the overall depth does not exceed 10, the stiffness of the beam will ordinarily be satisfactory in case of a

A)Simply supported beam
B)Continuous beam
C)Cantilever beam
D)None of these

Question 6

A pile of length carrying a uniformlydistributed load per metre length is suspended at two points, the maximum, B.M. at the centre of the pile or at the points of suspension, is

A)WL/8
B)WL²/24
C)WL²/47
D)WL²/16

Question 7

If is the net upward pressure on a square footing of side for a square column of side , the maximum bending moment is given by

A)B.M = pb (c - a)/4
B)B.M = pb (b -a)²/4
C)B.M = pb (b -a)²/8
D)B.M = pb (b +a)/8

Question 8

longitudinal bars and lateral stirrups, is

A)Stress in concrete × area of concrete
B)Stress in steel × area ofsteel
C)Stress in concrete × area of concrete + Stress in steel × area of steel
D)None of these

Question 9

If p₁ and p² are mutually perpendicular principal stresses acting on a soil mass, the normal stress on any plane inclined at angle ?? to the principal plane carrying the principal stress p₁, is:

A) (p₁ ? p²)/2+ (p₁ + p²)/2 sin 2?
B) (p₁ ? p²)/2+ (p₁ + p²)/2 cos 2?
C) (p₁ + p²)/2+ (p₁ ? p²)/2 cos 2?
D) (p₁ + p²)/2+ (p₁ ? p²)/2 sin 2?

Question 10

The minimum thickness of the cover at the end of a reinforcing bar should not be less than twice the diameter of the bar subject to a minimum of

A)10 mm
B)15 mm
C)20 mm
D)25 mm

Question 11

is the pre-stressed force applied to tendon of a rectangular pre-stressed beam whose area of cross section is and sectional modulus is. The minimum stress on the beam subjected to a maximum bending moment is

A)f = (P/A) -(Z/M)
B)f = (A/P) -(M/Z)
C)f = (P/A) - (M/Z)
D)f = (P/A) - (M/6Z)

Question 12

If C is creep coefficient, f is original pre-stress in concrete, m is modular ratio, E is Young's modulus of steel and e is shrinkage strain, the combined effect of creep and shrinkage is:

A)(1 - C)mf - eE
B)(C - 1)mf + eE
C)(C - 1)mf - eE
D)(1 - C)mf + eE

Question 13

In a pre-stressed member it is advisable to use

A)Low strength concrete only
B)High strength concrete only
C)Low strength concrete but high tensile steel
D)High strength concrete and high tensile steel

Question 14

An R.C.C. lintel is spanning an opening of 2 m span in a brick wall. The height of the roof is 2.9 m above the floor level and that of the opening is 2.1 m above the floor level. The lintel is to be designed for self weight plus

A)Triangular load of the wall
B)UDL of wall
C)UDL of wall + load from the roof
D)Triangular load + load from the roof

Question 15

The minimum clear cover for R.C.C. columns shall be

A)Greater of 40 mm or diameter
B)Smaller of 40 mm or diameter
C)Greater of 25 mm or diameter
D)Smaller of 25 mm or diameter

Question 16

An R.C.C beam of 25 cm width has a clear span of 5 metres and carries a U.D.L. of 2000kg/m inclusive of its self weight. If the lever arm of the section is 45 cm., the beam is

A)Safe in shear
B)Is safe with stirrups
C)Is safe with stirrups and inclinedmembers
D)Needsrevision ofthe section

Question 17

If the bearing capacity of soil is 10 tonnes/cm² and the projection of plain concrete footing from walls, is a cm, the depth D of footing is

A)D = 0.0775 a
B)D = 0.775 a
C)D = 0.775 ?a
D)D = 0.775 a²

Question 18

After pre-stressing process is completed, a loss of stress is due to

A)Shrinkage of concrete
B)Elastic shortening of concrete
C)Creep of concrete
D)All the above

Question 19

In a simply supported slab, alternate bars are curtailed at

A)1/4^th of the span
B)1/5^th of the span
C)1/6^th of the span
D)1/7^th of the span

Question 20

If R and T are rise and tread of a stair spanning horizontally, the steps are supported by a wall on one side and by a stringer beam on the other side, the steps are designed as beams of width

A)R + T
B)T - R
C) $\sqrt{R^{2}+T^{2}}$
D)R - T

Question 21

If p₁ and P₂ are effective lateral loadings at the bottom and top exerted by a level earth subjected to a super-load on the vertical face of height h of a retaining wall, the horizontal pressure p per unit length of the wall, is

A) (p₁?p₂)/2h
B) (p₁+p₂)/4h
C) (p₁+p₂)/2h
D) (p₁?p₂)2/3h

Question 22

In the zone of R.C.C. beam where shear stress is less than 5 kg/cm² , nominal reinforcement is provided at a pitch of

A)One-half lever arm of the section
B)One-third lever arm of the section
C)Lever arm of the section
D)One and half lever arm of the section

Question 23

Long and short spans of a two way slab are ly and lx and load on the slab acting on strips parallel to lx and ly be wx and wy respectively. According to Rankine Grashoff theory

A)(wx/wy) = (ly/lx)
B)(wx/wy) = (ly/lx)²
C)(wx/wy) = (ly/lx)⁴
D)None of these