In a combined footing if shear stress exceeds 5 kg/cm2, the nominal stirrups provided are:

In a combined footing if shear stress exceeds 5 kg/cm<sup>2</sup>, the nominal stirrups provided are:

If nominal shear stress $${\tau _{\text{v}}}$$ exceeds the design shear strength of concrete $${\tau _{\text{c}}}$$, the nominal shear reinforcement as per IS : 456-1978 shall be provided for carrying a shear stress equal to

A

$${\tau _{\text{v}}}$$

B

$${\tau _{\text{c}}}$$

C

$${\tau _{\text{v}}} - {\tau _{\text{c}}}$$

D

$${\tau _{\text{v}}} + {\tau _{\text{c}}}$$

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

A

6 legged

B

8 legged

C

10 legged

D

12 legged

Tresca or maximum-shear stress criteria assumes that yielding occurs when the maximum shear stress reaches a value of the shear stress in the uniaxial tension test. Assume the principal stress being σ1, σ2, σ3 where σ1 is largest, and σ3 is the smallest principal stresses. Find the value of minimum shear stress to cause yielding, given that yield stress in tension is equal to σo?

A

τ = σo

B

τ = σo/2

C

τ = σo/3

D

τ = σo/4

Consider the following statements: 1. According to Terzaghi’s, a foundation is shallow if its depth is equal to or less than its width. 2. Spread footing, strap footing and raft footing are types of shallow foundations. 3. Combined footing may be trapezoidal if the two columns carry unequal loads; and rectangular if both columns carry equal loads. 4. For water tanks, providing raft foundations will avoid unequal settlements. Which of the above statements are correct?

A

1, 2, 3 and 4

B

1, 2 and 3 only

C

1, 2 and 4 only

D

3 and 4 only

If q is the punching shear resistance per unit area a, is the side of a square footing for a column of side b, carrying a weight W including the weight of the footing, the depth (D) of the footing from punching shear consideration, is

A

$${\text{D}} = \frac{{{\text{W}}\left( {{\text{a}} - {\text{b}}} \right)}}{{4{{\text{a}}^2}{\text{bq}}}}$$

B

$${\text{D}} = \frac{{{\text{W}}\left( {{{\text{a}}^2} - {{\text{b}}^2}} \right)}}{{4{{\text{a}}^2}{\text{bq}}}}$$

C

$${\text{D}} = \frac{{{\text{W}}\left( {{{\text{a}}^2} - {{\text{b}}^2}} \right)}}{{8{{\text{a}}^2}{\text{bq}}}}$$

D

$${\text{D}} = \frac{{{\text{W}}\left( {{{\text{a}}^2} - {{\text{b}}^2}} \right)}}{{4{\text{abq}}}}$$

Match the conditions under which the given type of footing is used: a. Combined footing I. For two or more columns b. Mat foundation II. For isolated or group of columns c. Pile foundation III. For individual column d. Isolated footing IV. For supporting all columns of structure

A

a – II, b - III, c - IV, d - I

B

a - I, b - IV, c - II, d - III

C

a - II, b - I, c - III, d - IV

D

a - II, b - IV, c - I, d - III

A reinforced concrete cantilever beam is 3.6 m long, 25 cm wide and has its lever arm 40 cm. It carries a load of 1200 kg at its free end and vertical stirrups can carry 1800 kg. Assuming concrete to carry one-third of the diagonal tension and ignoring the weight of the beam, the number of shear stirrups required, is

A

30

B

35

C

40

D

45

Which of the following factors are affecting critical shear stresses? 1. Purity of metals reduces the critical shear stress 2. Surface films greatly enhance the critical shear stress 3. Rise in temperature 4. Rate of deformation and the extent of initial deformation also help in raising the critical shear stress

A

1, 2 and 3 only

B

1, 2 and 4 only

C

1, 3 and 4 only

D

1 ,2, 3 and 4

The Rheological behaviour of concrete, when represented by shear stress vs rate of shear, is characterized as Where : τ shear stress, Τ0 = (initial) yield value, μ = at-point plastic viscosity, γ̇ = at point rate of shear.

A

τ = τ₀ + μ . γ̇

B

τ₀ = τ + μ . γ̇

C

$\frac{\tau }{{{\tau _0}}} = \mu .\dot \gamma$

D

τ = μ . γ̇

Shear stress versus shear rate behavior of four different types of fluids (I, II, III and IV) are shown in the figure below.
Basic Principles of Biotechnology mcq question image

Basic Principles of Biotechnology mcq question image

Which one of the following options is correct?

A

I-Newtonian, II-Bingham plastic, III-Dilatant, IV-Pseudoplastic

B

I-Pseudoplastic, II-Dilatant, III-Newtonian, IV-Bingham plastic

C

I-Newtonian, II-Pseudoplastic, III-Bingham plastic, IV-Dilatant

D

I-Newtonian, II-Bingham plastic, III-Pseudoplastic, IV-Dilatant

In a combined footing if shear stress exceeds 5 kg/cm², the nominal stirrups provided are:

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