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)

Accepted Answer

The local bond stress $S_b$ in a beam is calculated as the shear force divided by the product of the lever arm and the total perimeter of reinforcement. This formula is used to estimate the stress developed between the reinforcing bars and the surrounding concrete, which is crucial for ensuring the structural integrity of the beam under shear forces.

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

Accepted Answer

A continuous beam is considered a deep beam if the ratio of effective span to overall depth is less than 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

Accepted Answer

The load W carried by the lintel, when the length of the wall on either side is at least half of its effective span L, and is equivalent to the weight of brickwork contained in an equilateral triangle, produces a maximum bending moment of WL/6. This is based on the principles of statics and the distribution of loads in structural analysis.

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

Accepted Answer

A balanced section in reinforced concrete design refers to the condition where the concrete in compression and the steel in tension reach their respective permissible stresses at the same time. This ensures an efficient use of materials, as neither the steel nor the concrete is overstressed or underutilized at failure.

Question 5

The vertical portion of a step in a stairs case, is known as
A)Rise
B)Flight
C)Winder
D)Tread

Accepted Answer

The vertical portion of a step in a staircase is called the "rise." It measures the height between one step and the next.

Question 6

For stairs spanning horizontally, the minimum waist provided is
A)4 cm
B)6 cm
C)8 cm
D)12 cm

Accepted Answer

The answer of For stairs spanning horizontally, the minimum waist...

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

Accepted Answer

Concrete piles offer several advantages over timber piles, including resistance to decay caused by termites, no restriction on length due to the ability to splice sections together, and a higher bearing capacity due to the strength of concrete.

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

Accepted Answer

The answer of If the average bending stress is 6...

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

Accepted Answer

The answer of For m²0 grade of concrete, the maximum...

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

Accepted Answer

The answer of The number of treads in a flight...

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

Accepted Answer

The bond strength between steel and concrete is due to both friction and adhesion. Friction provides a mechanical grip, while adhesion involves chemical bonding at the interface of steel and concrete.

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

Accepted Answer

The answer of In a public building width of stair...

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%

Accepted Answer

The answer of When minimum eccentricity in columns does not...

Question 14

The maximum percentage of moment redistribution allowed in RCC beams is
A)10%
B)20%
C)30%
D)40%

Accepted Answer

The maximum percentage of moment redistribution allowed in RCC (Reinforced Cement Concrete) beams is 30%, according to most design codes, to ensure ductility and structural safety.

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

Accepted Answer

Minimum grade of concrete for moderate exposure with normal weight aggregates is M 25.

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

Accepted Answer

Minimum grade of concrete for moderate exposure with normal weight aggregates is M25.

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%

Accepted Answer

The answer of The minimum reinforcement using mild steel in...

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

Accepted Answer

The answer of The stress strain curve for concrete is...

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

Accepted Answer

The answer of For a simply supported beam of span...

Question 20

Limit state method is based on probable
A)Load
B)Strength.
C)Both A and B
D)none

Accepted Answer

The Limit State Method in structural engineering design takes into account both probable loads and material strengths, ensuring safety and serviceability under expected conditions.

Quiz 5: Structure Integrity and Rigidity

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

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

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

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

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

For stairs spanning horizontally, the minimum waist provided is

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

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

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

The number of treads in a flight is equal to

The bond strength between steel and concrete is due to

In a public building width of stair should be at least

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

The maximum percentage of moment redistribution allowed in RCC beams is

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

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

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

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

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

Limit state method is based on probable

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

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