How many types of combined footing are possible?

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

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

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

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

If the wall or column under construction is near some other property, it will not be possible to spread the footing to both the sides of War or column. In search case which footing is used?

A

Simple pad footing

B

Eccentric footing

C

Isolated footing

D

Reinforced footing

Which one of the following is true with regard to a CPU having a single interrupt request line and single interrupt grant line? i) Neither vectored nor multiple interrupting devices is possible. ii) Vectored interrupts is not possible but multiple interrupting devices is possible. iii) Vectored interrupts is possible and multiple interrupting devices is not possible. iv) Both vectored and multiple interrupting devices are possible.

A

iii

B

i, iv

C

ii, iii

D

iii, iv

User level threads are threads that are visible to the programmer and are unknown to the kernel. The operating system kernel supports and manages kernel level threads. Three different types of models relate user and kernel level threads. Which of the following statements is/are true ? (a) (i) The Many - to - one model maps many user threads to one kernel thread (ii) The one - to - one model maps one user thread to one kernel thread (iii) The many - to - many model maps many user threads to smaller or equal kernel threads (b) (i) Many - to - one model maps many kernel threads to one user thread (ii) One - to - one model maps one kernel thread to one user thread (iii) Many - to- many model maps many kernel threads to smaller or equal user threads

A

(a) is true; (b) is false

B

(a) is false; (b) is true

C

Both (a) and (b) are true

D

Both (a) and (b) are false

Which type of footing is recommended when the property line is so close to one column that a spread footing would be eccentrically loaded when kept entirely within the property line?

A

Combined

B

Raft

C

Pile

D

Isolated

The gross bearing capacity of a footing is 450 kN/m2. If the footing is 1.5 in wide and is at a depth of 1 m in a clayey soil which has a unit weight of 20 kN/m3, then the net bearing capacity is

A

410 kN/m²

B

420 kN/m²

C

430 kN/m²

D

440 kN/m²

Consider the following statements: 1. The proportioning of footing in sand is more often governed by settlement rather than by bearing capacity. 2. The pressure bulb profiles under a strip footing form as co-axially imaginable bulbs under its length 3. Friction piles are also called ‘floating piles’ Which of the above statements are correct?

A

1, 2 and 3

B

1 and 2 only

C

1 and 3 only

D

2 and 3 only

Consider the following statements: For a rigid footing placed at the ground surface on sand, the contact pressure 1. is maximum at the edges. 2. is zero at the edges. 3. distribution is parabolic. 4. is uniform throughout the base of the footing. Which of the above statements are correct?

A

1 and 3 only

B

1 and 4 only

C

2 and 3 only

D

2 and 4 only

How many types of combined footing are possible?

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