Question 1

On an absolutely rigid foundation base, the pressure will
A)Be more at the edges of the foundation
B)Be uniform
C)Not be uniform
D)Be zero at the centre of the foundation

Accepted Answer

C

Question 2

The diameter of transverse reinforcement of columns should be equal to one-fourth of the diameter of the main steel rods but not less than
A)4 mm
B)5 mm
C)6 mm
D)7 mm

Accepted Answer

D

Question 3

For a continuous floor slab supported on beams, the ratio of end span length and intermediate span length, is
A)0.6
B)0.7
C)0.8
D)0.9

Accepted Answer

D

Question 4

In a singly reinforced beam
A)Compression is borne entirely by concrete
B)Steel possesses initial stresses when embedded in concrete
C)Plane sections transverse to the centre line of the beam before bending remain plane after bending
D)Elastic moduli for concrete and steel have different values within the limits of deformation of the beam

Accepted Answer

The answer of In a singly reinforced beam
A)Compression is borne...

Question 5

The ratio of the breadth to effective depth of a beam is kept
A)0.25
B)0.50
C)0.70
D)0.75

Accepted Answer

The ratio of the breadth to effective depth of a beam is commonly kept at 0.5 to ensure a balanced design that accommodates both bending and shear stresses effectively.

Question 6

A T-beam behaves as a rectangular beam of a width equal to its flange if its neutral axis
A)Remains within the flange
B)Remains below the slab
C)Coincides the geometrical centre of the beam
D)None of these

Accepted Answer

When the neutral axis remains within the flange of a T-beam, the beam behaves similarly to a rectangular beam because the entire flange is in compression, similar to the top compression zone of a rectangular beam.

Question 7

The width of the rib of a T-beam, is generally kept between
A)1/7 to 1/3 of rib depth
B)1/3 to 1/2 of rib depth
C)1/2 to 3/4 of rib depth
D)1/3 to 2/3 of rib depth

Accepted Answer

The width of the rib of a T-beam is generally kept between 1/3 to 2/3 of the rib depth to ensure a balanced design that is strong enough to support the loads without being excessively heavy or material-intensive. This range provides a good compromise between structural efficiency and material usage.

Question 8

For the design of a simply supported T-beam the ratio of the effective span to the overall depth of the beam is limited to
A)10
B)15
C)20
D)25

Accepted Answer

The ratio of the effective span to the overall depth of a simply supported T-beam is generally limited to 20 to ensure adequate stiffness and to control deflection.

Question 9

If the depth of actual neutral axis of a doubly reinforced beam
A)Is greater than the depth of critical neutral axis, the concrete attains its maximum stress earlier
B)Is less than the depth of critical neutral axis, the steel in the tensile zone attains its maximum stress earlier
C)Is equal to the depth of critical neutral axis; the concrete and steel attain their maximum stresses simultaneously
D)All the above

Accepted Answer

The statements accurately describe the behavior of a doubly reinforced beam under different conditions regarding the actual neutral axis and the critical neutral axis. When the actual neutral axis is deeper than the critical, concrete reaches its maximum stress first. If it's shallower, the tensile steel reaches its maximum stress first. When both are equal, both materials reach their maximum stresses simultaneously.

Question 10

The maximum diameter of a bar used in a ribbed slab, is
A)12 mm
B)6 mm
C)20 mm
D)22 mm

Accepted Answer

The answer of The maximum diameter of a bar used...

Question 11

If the diameter of the main reinforcement in a slab is 16 mm, the concrete cover to main bars is
A)10 mm
B)12 mm
C)14 mm
D)16 mm

Accepted Answer

The concrete cover for main reinforcement bars in a slab is typically equal to the diameter of the bar, which in this case is 16 mm.

Question 12

Minimum spacing between horizontal parallel reinforcement of different sizes, should not be less than
A)One diameter of thinner bar
B)One diameter of thicker bar
C)Twice the diameter of thinner bar
D)None of these

Accepted Answer

The answer of Minimum spacing between horizontal parallel reinforcement of...

Question 13

The diameter of main bars in R.C.C. columns, shall not be less than
A)6 mm
B)8 mm
C)10 mm
D)12 mm

Accepted Answer

The diameter of main bars in reinforced concrete columns should not be less than 12 mm. This is to ensure adequate strength and stability of the column structure.

Question 14

Dimensions of a beam need be changed if the shear stress is more than A)10 kg/cm² B)15 kg/cm² C)20 kg/cm² D)25 kg/cm²

Accepted Answer

The dimensions of a beam need to be changed if the shear stress exceeds the allowable limit, which is typically around 20 kg/cm² for many materials.

Question 15

The effective span of a simply supported slab, is
A)Distance between the centres of thebearings
B)Clear distance between the inner faces of the walls plus twice the thickness of the wall
C)Clear span plus effective depth of the slab
D)None of these

Accepted Answer

The effective span of a simply supported slab is the clear distance between the inner faces of the walls plus twice the thickness of the wall.

Question 16

The maximum ratio of span to depth of a cantilever slab, is
A)8
B)10
C)12
D)16

Accepted Answer

The maximum span to depth ratio for a cantilever slab is typically 12, as per standard design guidelines, to ensure adequate structural performance and deflection control.

Question 17

An R.C.C. roof slab is designed as a two way slab if
A)It supports live loads in both directions
B)The ratio of spans in two directions is less than 2
C)The slab is continuous over two supports
D)The slab is discontinuous at edges

Accepted Answer

A two-way slab is designed when the ratio of spans in two perpendicular directions is less than 2, indicating that loads are distributed in both directions.

Question 18

In a combined footing for two columns carrying unequal loads, the maximum hogging bending moment occurs at
A)Less loaded column
B)More loaded column
C)A point of the maximum shear force
D)A point of zero shear force

Accepted Answer

The maximum hogging bending moment in a combined footing for two columns carrying unequal loads occurs at a point of zero shear force. This is because bending moments are at their maximum where shear forces change sign, indicating a point of inflection where the bending moment curve reaches a peak.

Question 19

If the effective length of a 32 cm diameter R.C.C. column is 4.40 m, its slenderness ratio, is
A)40
B)45
C)50
D)55

Accepted Answer

The answer of If the effective length of a 32...

Question 20

The radius of a bar bend to form a hook, should not be less than
A)Twice thediameter
B)Thrice thediameter
C)Four times the diameter
D)Five times the diameter

Accepted Answer

The answer of The radius of a bar bend to...

Quiz 3: Concrete Design and Analysis

On an absolutely rigid foundation base, the pressure will

The diameter of transverse reinforcement of columns should be equal to one-fourth of the diameter of the main steel rods but not less than

For a continuous floor slab supported on beams, the ratio of end span length and intermediate span length, is

In a singly reinforced beam

The ratio of the breadth to effective depth of a beam is kept

A T-beam behaves as a rectangular beam of a width equal to its flange if its neutral axis

The width of the rib of a T-beam, is generally kept between

For the design of a simply supported T-beam the ratio of the effective span to the overall depth of the beam is limited to

If the depth of actual neutral axis of a doubly reinforced beam

The maximum diameter of a bar used in a ribbed slab, is

If the diameter of the main reinforcement in a slab is 16 mm, the concrete cover to main bars is

Minimum spacing between horizontal parallel reinforcement of different sizes, should not be less than

The diameter of main bars in R.C.C. columns, shall not be less than

Dimensions of a beam need be changed if the shear stress is more than

The effective span of a simply supported slab, is

The maximum ratio of span to depth of a cantilever slab, is

An R.C.C. roof slab is designed as a two way slab if

In a combined footing for two columns carrying unequal loads, the maximum hogging bending moment occurs at

If the effective length of a 32 cm diameter R.C.C. column is 4.40 m, its slenderness ratio, is

The radius of a bar bend to form a hook, should not be less than