Engineering/Civil -MCQ RCC Structures Design - Section 3 Sample Test,Sample questions

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

1.one diameter of thinner bar

2.one diameter of thicker bar

3.sum of the diameters of ihinner and thicker bars

4. twice the diameter of thinner bar


Question:
  
A part of the slab may be considered as the flange of the T-beam if

1. flange has adequate reinforcement transverse to beam

2.it is built integrally with the beam

3.it is effectively bonded together with the beam

4.all the above.


Question:
  
If C is creep coefficient, f is original prestress in concrete, m is modular ratio, E is Young's modulus of steel and e is shrinkage strain, the combined effect of creep and shrinkage is:

1. (1 - C)mf - eE

2. (C - 1)mf + eE

3. (C - 1)mf - eE

4. (1 - C)mf + eE


Question:
 A pre-stressed concrete member

1.is made of concrete

2.is made of reinforced concrete

3.is stressed after casting

4. possesses internal stresses.


Question:
 If permissible working stresses in steel and concrete are respectively 1400 kg/cm2 and 80 kg/cm2 and modular ratio is 18, in a beam reinforced in tension side and of width 30 cm and having effective depth 46 cm, the lever arms of the section, is

1.37 cm

2.38 cm

3.39 cm

4.40 cm


Question:
 If the loading on a prestressed rectangular beam, is uniformly distributed, the tendon to be provided should be.

1. straight below centroidal axis

2.parabolic with convexity downward

3.parabolic with convexity upward

4.straight above centroidal axis


Question:
 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

1.4 mm

2.5 mm

3.6 mm

4.7 mm


Question:
 The minimum clear cover for R.C.C. columns shall be

1. greater of 40 mm or diameter

2. smaller of 40 mm or diameter

3.greater of 25 mm or diameter

4.smaller of 25 mm or diameter


Question:
 The minimum clear cover for R.C.C. columns shall be

1.greater of 40 mm or diameter

2.smaller of 40 mm or diameter

3. greater of 25 mm or diameter

4.smaller of 25 mm or diameter


Question:
A circular slab subjected to external loading, deflects to form a

1.semi-hemisphere

2.ellipsoid

3.parabolloid

4.none of these.


Question:
A flat slab is supported

1.on beams

2.on columns

3.on beams and columns

4. all the above


Question:
A foundation is called shallow if its depth, is

1.one-fourth of its width

2.half of its width

3.three-fourth of its width

4.equal to its width


Question:
A raft foundation is provided if its area exceeds the plan area of the building by

1.10%

2.20%

3.30%

4.50%


Question:
According to the steel beam theory of doubly reinforced beams

1.tension is resisted by tension steel

2. compression is resisted by compression steel

3.. stress in tension steel equals the stress in compression steel

4.all the above.


Question:
An R.C.C beam of 25 cm width has a clear span of 5 metres and carries a U.D.L. of 2000 kg/m inclusive of its self weight. If the lever arm of the section is 45 cm., the beam is

1.safe in shear

2.is safe with stirrups

3.is safe with stirrups and inclined members

4. needs revision of the section.


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

1.it supports live loads in both directions

2.the ratio of spans in two directions is less than 2

3. the slab is continuous over two supports

4. the slab is discontinuous at edges.


Question:
An under-reinforced section means

1.Steel is provided at the under side only

2. Steel provided is insufficient

3.Steel provided on one face only

4.Steel will yield first.


Question:
Design of R.C.C. cantilever beams, is based on the resultant force at

1.fixed end

2. free end

3.mid span

4. mid span and fixed support.


Question:
If depth of slab is 10 cm, width of web 30 cm, depth of web 50 cm, centre to centre distance of beams 3 m, effective span of beams 6 m, the effective flange width of the beam, is

1.200 cm

2.300 cm

3.150 cm

4.100 cm


Question:
If diameter of a reinforcement bar is d, the anchorge value of the hook is

1.4d

2.8d

3.12d

4.16d


Question:
If H is the overall height of a retaining wall retaining a surcharge, the width of the base slab usually provided, is

1. 0.3 H

2. 0.4 H

3. 0.5 H

4.0.7 H


Question:
If the loading on a prestressed rectangular beam, is uniformly distributed, the tendon to be provided should be

1.straight below centroidal axis

2. parabolic with convexity downward

3.parabolic with convexity upward

4.straight above centroidal axis


Question:
If the size of a column is reduced above the floor, the main bars of the columns, are

1.continued up

2.bent inward at the floor level

3.stopped just below the floor level and separate lap bars provided

4. all the above.


Question:
If the size of a column is reduced above the floor, the main bars of the columns, are

1.continued up

2.bent inward at the floor level

3.stopped just below the floor level and separate lap bars provided

4.all the above.


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

1. less loaded column

2.more loaded column

3.more loaded column

4.a point of zero shear force.


Question:
In a combined footing if shear stress does not exceed 5 kg/cm2, the nominal stirrups provided are

1.6 legged

2.8 legged

3.10 legged

4.12 legged


Question:
In a singly reinforced beam, if the permissible stress in concrete reaches earlier than that in steel, the beam section is called

1.under-reinforced section

2.over reinforced section

3.economic section

4.critical section.


Question:
In testing a pile by load test, pile platform is loaded with one and half times the design load and a maximum settlement is noted The load is gradually removed and the consequent rebound is measured For a safe pile, the net settlement (ie total settlement minus rebound) per tonne of test load should not exceed

1.10 mm

2.15 mm

3.20 mm

4.25 mm


Question:
On piles, the drop must be at least

1.80 cm

2.100 cm

3.120 cm

4.140 cm


Question:
Piles are usually driven by 

1.diesel operated hammer

2.drop hammer

3.single acting steam hammer

4.all the above.


Question:
The anchorage value of a hook is assumed sixteen times the diameter of the bar if the angle of the bend, is

1.30 degree

2.40 degree

3.45 Degree

4.all the above.


Question:
The angle of internal friction of soil mass is the angle whose

1.tangent is equal to the rate of the maximum resistance to sliding on any internal inclined plane to the normal pressure acting on the plane

2.sine is equal to the ratio of the maximum resistance to sliding on any internal inclined plane to the normal pressure acting on the plane

3.cosine is equal to the ratio of the maximum resistance sliding on any internal inclined plane to the normal pressure acting on the plane

4.none of these.


Question:
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

1.12 bar diameters

2.18 bar diameters

3.24 bar diameters

4.30 bar diameters


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

1.The least lateral dimension of the column

2.Sixteen times the diameter of the smallest longitudinal reinforcing rods in the column

3.Forty-eight times the diameter of transverse reinforcement

4.all the above.


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

1.Freyssinet system

2.Magnel-Blaton system

3. C.C.L. standard system

4.Lee-McCall system.


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

1.Freyssinet system

2.Magnel-Blaton system

3. C.C.L. standard system

4. Lee-McCall system.


Question:
The thickness of the flange of a Tee beam of a ribbed slab is assumed as

1. width of the rib

2.depth of the rib

3.the thickness of the rib

4. twice the width of the rib.


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

1.0.1 L from the outer edge of column

2.0.1 L from the centre edge of column

3. half the distance of projection

4.one-fourth the distance of projection.


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