Deck 1: Structural Design and Analysis

Question 1

An R.C.C. beam of 6 m span is 30 cm wide and has a lever arm of 55 cm. If it carries a U.D.L. of 12 t per m and allowable shear stress is 5 kg/cm², the beam

A)Is safe in shear
B)Is safe with stirrups
C)Is safe with stirrups and inclined bars
D)Needs revision of section

Answer 1

Is safe with stirrups

Question 2

According to I.S. : 456, slabs which span in two directions with corners held down, are assumed to be divided in each direction into middle strips and edge strips such that the width of the middle strip, is

A)Half of the width of the slab
B)Two-third of the width of the slab
C)Three-fourth of the width of the slab
D)Four-fifth of the width of the slab

Answer 2

Three-fourth of the width of the slab

Question 3

The load stress of a section can be reduced by

A)Decreasing the lever arm
B)Increasing the total perimeter of bars
C)Replacing larger bars by greater number of small bars
D)Replacing smaller bars by greater number of greater bars

Answer 3

Replacing larger bars by greater number of small bars

Question 4

The diameter of the column head support a flat slab, is generally kept

A)0.25 times the span length
B)0.25 times the diameter of the column
C)4.0 cm larger than the diameter of the column
D)5.0 cm larger than the diameter of the column

Question 5

If 'W' is the uniformly distributed load on a circular slab of radius 'R'fixed at tsends, the maximum positive radial moment at its centre, is

A)3WR²/16
B)2WR²/16
C)WR²/16
D)None of these

Question 6

The maximum ratio of span to depth of a slab simply supported and

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

Question 7

Pick up the correct statement from the following

A)Lateral reinforcement in R.C.C. columns is provided to prevent the longitudinal reinforcement from buckling
B)Lateral reinforcement prevents the shearing of concrete on diagonal plane
C)Lateral reinforcement stops breaking away of concrete cover, due to buckling
D)All the above

Question 8

In case the factor of safety against sliding is less than 1.5, a portion of slab is constructed downwards at the end of the heel slab, which is known as

A)A key
B)A cut-off wall
C)A rib
D)All the above

Question 9

Lapped splices in tensile reinforcement are generally not used for bars of size larger than

A)18 mmdiameter
B)24 mmdiameter
C)30 mmdiameter
D)36 mmdiameter

Question 10

Minimum spacing between horizontal parallel reinforcement of the same size should not be less than

A)Onediameter
B)2.5 diameters
C)3 diameters
D)3.5 diameters

Question 11

For a ribbed slab

A)Clear spacing between ribs shall not be greater than 4.5 cm
B)Width of the rib shall not be less than 7.5 cm
C)Overall depth of the slab shall not exceed four times the breadth of the rib
D)All the above

Question 12

A very comfortable type of stairs is

A)Straight
B)Dog legged
C)Geometrical
D)Open newel

Question 13

Columns may be made of plain concrete if their unsupported lengths do not exceed their least lateral dimension

A)Two times
B)Three times
C)Four times
D)Five times

Question 14

The width of the flange of a L-beam, should be less than

A)One-sixth of the effective span
B)Breadth of therib + four times thickness of the slab
C)Breadth of the rib + half clear distance betweenribs
D)Least of theabove

Question 15

To ensure uniform pressure distribution, the thickness of the foundation, is

A)Kept uniform throughout
B)Increased gradually towards the edge
C)Decreased gradually towards the edge
D)Kept zero at theedge

Question 16

The maximum permissible size of aggregates to be used in casting the ribs of a slab, is

A)5 mm
B)7.5 mm
C)10 mm
D)15 mm

Question 17

Pick up the incorrect statement from the following: Tensile reinforcement bars of a rectangular beam

A)Are curtailed if not required to resist the bendingmoment
B)Are bent up at suitable places to serve as shearreinforcement
C)Are bent down at suitable places to serve asshear reinforcement
D)Are maintained at bottom to provide at least local bond stress

Question 18

Steel bars are generally connected together to get greater length than the standard length by providing

A)Straight bar splice
B)Hooked splice
C)Dowel splice
D)All the above

Question 19

Top bars are extended to the projecting parts of the combined footing of two columns Ldistance apart for a distance of

A)0.1 L from the outer edge of column
B)0.1 L from the centre edge ofcolumn
C)Half the distance of projection
D)One-fourth the distance of projection

Question 20

For M 150 grade concrete (1:2:4) the moment of resistance factor is

A)0.87
B)8.50
C)7.50
D)5.80

Question 21

The minimum thickness of a flat slab is taken

A)L/32 for end panels without drops
B)L/36 for end panels without drops
C)L/36 for interior panels without drop
D)All the above

Question 22

The neutral axis of a T-beam exists

A)Within the flange
B)At the bottom edge of the slab
C)Below the slab
D)All the above

Question 23

The design of heel slab of a retaining wall is based on the maximum bending moment due to:

A)Its own weight
B)Weight of the soil above it
C)Load of the surcharge, if any
D)All the above

Question 24

A pre-cast pile generally used, is

A)Circular
B)Square
C)Octagonal
D)Square with corners chamfered

Question 25

The spacing of transverse reinforcement of column is decided by the following consideration.

A)The least lateral dimension of the column
B)Sixteen times the diameter of the smallest longitudinal reinforcing rods in the column
C)Forty-eight times the diameter of transverse reinforcement
D)All the above