Test: Beams & Slabs - 3 - Civil Engineering (CE) MCQ

# Test: Beams & Slabs - 3 - Civil Engineering (CE) MCQ

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## 20 Questions MCQ Test Topicwise Question Bank for Civil Engineering - Test: Beams & Slabs - 3

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Test: Beams & Slabs - 3 - Question 1

### A reinforced concrete member is subjected to combined action of compressive axial force and bending moment. If εc is the least compressive strain in the member, fy, the yield stress of steel and, Es, the modulus of elasticity of steel, the maximum permissible compressive strain in concrete member will be

Detailed Solution for Test: Beams & Slabs - 3 - Question 1

Maximum permissible compressive strain in concrete under, axial , compression is taken as 0.002
The maximum compressive strain at the highly compressed extreme fibre in concrete subjected to axial compression and bending and when there is no tension on the section shall be 0.0035 minus 0.75 times the strain at the least compressed extreme fibre.

Test: Beams & Slabs - 3 - Question 2

### The span to depth ratio limit is specified in IS: 456-2000 for the reinforced concrete beams, in order to ensure that the

Detailed Solution for Test: Beams & Slabs - 3 - Question 2

Basic values of span to effective depth ratios.for spans upto 10 m to satisfy vertical deflection limits are for
Cantilever beam - 7
Simply supported - 20
Continuous - 26

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Test: Beams & Slabs - 3 - Question 3

### As per the provisions of IS : 456-2000, in the limit state method for design of beams, the limiting value of the depth of neutral axis in a reinforced concrete beam of effective depth 'd' is given as

Detailed Solution for Test: Beams & Slabs - 3 - Question 3

The limiting values of depth of neutral axis depending on the different grades of steel is as follows:

Test: Beams & Slabs - 3 - Question 4

If the permissible stress in steel in tension is 140 N/mm2, then the depth of neutral balanced section using working stress method is

Detailed Solution for Test: Beams & Slabs - 3 - Question 4

Depth of balanced neutral section using working stress method is given by,
⇒

Test: Beams & Slabs - 3 - Question 5

A continuous beam is deemed to be a deep beam when the ratio of effective span to overall depth (l/D) is less than

Test: Beams & Slabs - 3 - Question 6

According to IS 456 recommendations,'the maximum depth of stress block for balanced section of a beam of effective depth d is

Test: Beams & Slabs - 3 - Question 7

For a continuous R.C. beam, match List-I (Condition) with List-II (Placement of live load) and select the correct answer using the codes given below the lists.
List-I
A. For maximum sagging moment in a span
B. For maximum hogging moment at a support
C. For maximum hogging moment in a span
List-II
1. The span adjoining the span as well as alternate span
2. The same span as well as alternate spans
3. The adjacent spans on both sides of this support as well as spans alternate to these
4. Spans next to the adjacent spans of the support plus alternate spans

Test: Beams & Slabs - 3 - Question 8

In a doubly reinforced rectangular beam, the allowable stress in compression steel is

Detailed Solution for Test: Beams & Slabs - 3 - Question 8

The stress in the compression steel depends on the strain, ∈sc, the level of compression steel. The strain at the level of compression steel under loading does not reach the yield strain value of steel. Therefore, allowable stress is less than the permissible stress in tension in steel. The maximum permissible compressive stress in steel are 130 MPa and 190 MPa for Fe 250, Fe 415 and Fe 500 grades respectively.

Test: Beams & Slabs - 3 - Question 9

The side face reinforcement, if required, in a 7-beam’will be

Detailed Solution for Test: Beams & Slabs - 3 - Question 9

For beams exceeding overall depth of 750 mm side face reinforcement is provided. Such reinforcement shall be not less than 0.1 percent of the web area and shall be distributed equally on two faces at a spacing not exceeding 300 mm or web thickness whichever is less.

Test: Beams & Slabs - 3 - Question 10

Deep beams are designed for

Test: Beams & Slabs - 3 - Question 11

The effective depth of a singly reinforced rectangular beam is 30 cm. The section is over reinforced and the neutral axis is 12 cm below the top. If the maximum stress attained by- concrete is 50 kg/cm2 and the modular ratio is 18, then the stress developed in steel would be

Detailed Solution for Test: Beams & Slabs - 3 - Question 11

The limiting value l/D for simply supported and continuous span deep beams are as follow: For simple span deep beam, l/D < 2.0
For continuous span deep beam, l/d ≤ 2.5
where,
l = Effective span taken as centre to centre distance between the supports of 1.15 time the clear span, whichever is smaller,
D =  Overall depth
d = 30 cm
xu = 12 cm
C = 50 kg/cm2
m = 18

Test: Beams & Slabs - 3 - Question 12

Which one of the following statements about the percentage of tensile steel required to produce a balanced reinforced concrete section is correct?
The required percentage of steel

Detailed Solution for Test: Beams & Slabs - 3 - Question 12

For a balanced section,
0.36 fck.b.x = 0.87 fy Ast
⇒
As fy increases Ast decreases.

Test: Beams & Slabs - 3 - Question 13

Minimum clear cover (in mm) to the main steel bars in slab, beam, column and footing respectively are

Test: Beams & Slabs - 3 - Question 14

Beam sections designed in accordance with LSM as compared to sections designed in accordance with WSM will have

Test: Beams & Slabs - 3 - Question 15

If the depth of actual neutral axis in a beam is more than the depth of critical neutral axis, the beam is called:

Detailed Solution for Test: Beams & Slabs - 3 - Question 15

xu > xu,critical : Over reinforced section
xu = xu'critical : Balanced section
xu < xucritical : Under-reinforced section

Test: Beams & Slabs - 3 - Question 16

For a continuous slab of 3 m x 3.5 m size the minimum overall depth of slab to satisfy vertical deflection limits is

Detailed Solution for Test: Beams & Slabs - 3 - Question 16

The shorter span length is 3000 mm.
For two-way continuous slab with mild steel as reinforcement,

Hence, the minimum overall depth of slab for mild steel to satisfy the vertical deflection limit is 75 mm or 7.5 cm.

Test: Beams & Slabs - 3 - Question 17

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

Detailed Solution for Test: Beams & Slabs - 3 - Question 17

Minimum reinforcement (Ast)min in either direction in slabs is given by,

Test: Beams & Slabs - 3 - Question 18

In the reinforced concrete slab, the spacing between main reinforcement should not exceed

Detailed Solution for Test: Beams & Slabs - 3 - Question 18

Maximum diameter of reinforcing bars in slabs is limited to one-eight of the total thickness of slab and the maximum spacing of main bars is limited to 3d or 300 mm (whichever is less).

Test: Beams & Slabs - 3 - Question 19

The reinforced concrete beam curved in plane is designed for

Test: Beams & Slabs - 3 - Question 20

Flexural collapse in over-reinforced beam is due to

Detailed Solution for Test: Beams & Slabs - 3 - Question 20

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