Deck 5: Structure Integrity and Rigidity

Question 1

In a beam the local bond stress Sb, is equal to

A)Shear force/(Leaver arm × Total perimeter of reinforcement)
B)Total perimeter of reinforcement/(Leaver arm × Shear force)
C)Leaver arm/(Shear force × Total perimeter of reinforcement)
D)Leaver arm/(Bending moment × Total perimeter ofreinforcement)

Answer 1

Shear force/(Leaver arm × Total perimeter of reinforcement)

Question 2

A continuous beam shall be deemed to be a deep beam if the ratio of effective span to overall depth, is

A)2.5
B)2.0
C)Less than 2
D)Less than 2.5

Answer 2

2.5

Question 3

If the length of a wall on either side of a lintel opening is at least half of its effective span L, the load W carried by the lintel is equivalent to the weight of brickwork contained in an equilateral triangle, producing a maximum bending moment

A)WL/2
B)WL/4
C)WL/6
D)WL/8

Answer 3

WL/6

Question 4

The section of a reinforced beam where most distant concrete fibre in compression and tension in steel attains permissible stresses simultaneously, is called

A)Balanced section
B)Economic section
C)Critical section
D)All the above

Question 5

The vertical portion of a step in a stairs case, is known as

A)Rise
B)Flight
C)Winder
D)Tread

Question 6

For stairs spanning horizontally, the minimum waist provided is

A)4 cm
B)6 cm
C)8 cm
D)12 cm

Question 7

The advantage of a concrete pile over a timber pile, is

A)No decay due to termites
B)No restriction on length
C)Higher bearingcapacity
D)All the above

Question 8

If the average bending stress is 6 kg/cm² for M 150 grade concrete, the length of embedment of a bar of diameter d according to I.S. 456 specifications, is

A)28 d
B)38 d
C)48 d
D)58 d

Question 9

For m²0 grade of concrete, the maximum shear stress shall not exceed

A)1.6 N/mm²
B)1.9 N/mm²
C)2.8 N/mm²
D)2.2 N/mm²

Question 10

The number of treads in a flight is equal to

A)Risers in the flight
B)Risers plus one
C)Risers minus one
D)None of these

Question 11

The bond strength between steel and concrete is due to

A)friction
B)adhesion
C)both friction and adhesion
D)None of these

Question 12

In a public building width of stair should be at least

A)1000 mm
B)1200 mm
C)1500 mm
D)1800 mm

Question 13

When minimum eccentricity in columns does not exceed 0.05 times the lateral dimension, the axial load carrying capacity is reduced by

A)8%
B)11%
C)14%
D)20%

Question 14

The maximum percentage of moment redistribution allowed in RCC beams is

A)10%
B)20%
C)30%
D)40%

Question 15

Minimum grade of concrete for moderate exposure with normal weight aggregates is

A)M 15
B)M 20
C)M 25
D)M 35

Question 16

Minimum grade of concrete for moderate exposure with normal weight aggregates is

A)M 15
B)M 20
C)M 25
D)M 35

Question 17

The minimum reinforcement using mild steel in slab should not be less than

A)0.10%
B)0.12%
C)0.15%
D)2.0%

Question 18

The stress strain curve for concrete is considered parabolic by I.S. code upto a strain of

A)0.0015
B)0.0020
C)0.0030
D)0.0035

Question 19

For a simply supported beam of span 15 m, the minimum effective depth to satisfy the vertical deflection limits should be

A)600 mm
B)750 mm
C)900 mm
D)more than 1 m

Question 20

Limit state method is based on probable

A)Load
B)Strength.
C)Both A and B
D)none

Question 21

The ratio of permissible shear stress in limit state method oof design and working stress method of design is

A)25 : 16
B)5 : 4
C)16 : 25
D)4 : 5

Question 22

If no compression steel is used, two suspended bars of minimum ______ diameter should be used to support shear reinforcement

A)8 mm
B)10 mm
C)12 mm
D)16 mm

Question 23

The load carrying capacity of helically reinforced column as compared to

A)5% less
B)10% less
C)5% more
D)10% more

Question 24

What is the minimum number of longitudinal bars provided in a reinforced concrete column of circular circular cross-section ?

A)4
B)5
C)6
D)8

Question 25

For water retaining structures, minimum grade of concrete to be used is

A)M 15
B)M 20
C)M 25
D)M 40