Deck 4: Concrete Design and Analysis

Question 1

An intermediate T-beam reinforced with two layers of tensile steel with clear cover 13 cm encasted with the floor of a hall 12 metres by 7 metres, is spaced at 3 metres from adjoining beams and if the width of the beam is 20 cm, the breadth of the flange is

A)300 cm
B)233 cm
C)176 cm
D)236 cm

Answer 1

176 cm

Question 2

As the percentage of steel increases

A)Depth of neutral axis decreases
B)Depth of neutral axis increases
C)Lever arm increases
D)Lever armdecreases

Answer 2

Depth of neutral axis increases

Question 3

The effective width of a column strip of a flat slab, is

A)One-fourth the width of the panel
B)Half the width of the panel
C)Radius of the column
D)Diameter ofthe column

Answer 3

Half the width of the panel

Question 4

As per IS : 1343, total shrinkage for a pre-tensioned beam, is

A)3.0 × 10^-2
B)3.0 × 10^-3
C)3.0 × 10^-5
D)3.5 × 10^-5

Question 5

Based on punching shear consideration, the overall depth of a combined footing under a column A, is

A)(Area of the column A × Safe punching stress)/Load on column A
B)(Perimeter of column A × Safe punching stress)/(Load on column A + Upward pressure × Area of the column)
C)(Perimeter of column A × Safe punching stress)/(Load on column A × Upward pressure × Area of the column)
D)None of these

Question 6

Pick up the correct statement from the following:

A)A pile is a slender member which transfersthe load through its lower end on a strong strata
B)A pile is a slender member which transfers its load to the surrounding soil
C)A pile is a slender member which transfers its load by friction
D)A pile is a cylindrical body of concrete which transfersthe load at a depth greater than its width

Question 7

In a combined footing if shear stress exceeds 5 kg/cm² , the nominal stirrups provided are:

A)6 legged
B)8 legged
C)10 legged
D)12 legged

Question 8

If is weight of a retainingwall and is the horizontal earth pressure, the factor of safety against sliding, is

A)1.0
B)1.25
C)1.5
D)2.0

Question 9

With usual notations the depth of the neutral axis of a balanced section, is given by

A)mc/t = (d -n)/n
B)t/mc = (d -n)/n
C)t/mc = (d + n)/n
D)mc/t = n/(d - n)

Question 10

Pick up the true statement from the following:

A)Plain ceiling provides the best property diffusing light
B)In the absence of beams, it is easier to installpiping
C)In the absence of beams, it is easier topaint
D)All the above

Question 11

If the maximum shear stress at the end of a simply supported R.C.C. beam of 16 m effective span is 10 kg/cm² , the length of the beam having nominal reinforcement, is

A)8 cm
B)6 m
C)8 m
D)10 m

Question 12

The length of the lap in a compression member is kept greater than bar diameter x (Permissible stress in bar / Five times the bond stress) or

A)12 bardiameters
B)18 bardiameters
C)24 bardiameters
D)30 bardiameters

Question 13

The system in which high tensile alloy steel bars (silica manganese steel) are used as prestressing tendons, is known as

A)Freyssinet system
B)Magnel-Blaton system
C)C.C.L. standardsystem
D)Lee-McCallsystem

Question 14

An under-reinforced section means

A)Steel is provided at the underside only
B)Steel provided is insufficient
C)Steel provided on one face only
D)Steel will yieldfirst