STRUCTURAL ANALYSIS – TRIBUTARY AREAS

 1. The tributary is an unloaded area. This statement is:-

a) True

b) False

Explanation: The tributary area is the loaded area of a particular structure directly contributing to the load applied.

2. The tributary area lines between two columns/beams are at how much distance from one of the beam?

a) 0.2 of the total in between length

b) 0.4 of the total in between length

c) 0.5 of the total in between length

d) Depends on the amount of load carried

Explanation: Tributary area is bounded by lines lying halfway from next beam/column, irrespective of load carried.

3. For an interior girder, what is the shape of tributary area?

a) Rectangular

b) Triangular

c) Circular

d) Depends upon case

Explanation: If the girder surrounding the girder in question is similar to it, then it will be a triangle, otherwise it might be trapezium in some cases. 

4. What is the maximum no. of structures to which an area can be a tributary are to?
a) 1
b) 2
c) 3
d) 4

Explanation: A particular area can’t be a tributary area to more than one member of a structure at one time.

5. Which out of the following statements is true?
a) Tributary area > influence area
b) Tributary area <= influence area
c) Tributary area >= influence area
d) No relation can be defined

Explanation: An influence area is always a tributary area. So, tributary area <= influence area.

6. If in an interior beam, adjacent structures are exactly similar then the tributary area is:
a) Trapezium
b) Acute triangle
c) Obtuse triangle
d) Right angled triangle

Explanation: Since, the structures are similar; angles of triangle will be 45 and 90 degrees.

7. One area can serve as an influence area to more than one member of a structure at the same time.
State whether the above statement is true or false.
a) True
b) False

Explanation: Unlike tributary areas influences can serve to more than one as they can affect more than one forces on loaded.

8. When column supports the top floor of a building, then live load reduction is:-

a) Permitted
b) Not permitted
c) Depends upon type of beam
d) Depends upon amount of load 

Explanation: When column support a floor, it should be thought of as supporting a single floor only.

Technical Questions for civil engineer

1.What is the minimum CBR of subgrade   soil ?

As per IRC 58-2015 Clause 5.7.3.6 , a minimum CBR of 8 % is recommended for 500 mm of selected soil used as subgrade.

2. What is code reference from which you are performing CBR test with 3 energy level as per MORTH 5 revision ?

AASHTO Designation: T 193-99 -2003

3. What is the limit of Air Voids , flow & VFB in Dense Bituminous Macadam mix design ?

The limit of Air voids , flow & VFB is 3 -5% , 2- 4 mm & 65-75% simultaneously.

4.What should be the minimum required density of Subgrade soil as per MORT&H 5th revision ?

17.5 KN/m³ or 1.78 gm /cc

5.What is the softening point of VG 30 & VG40 grade bitumen ?

The softening point of VG30/VG 40 grade bitumen is 47 ºC / 50ºC

6.What will be the maximum allowable size of granular material for subgrade soil as per MORT&H specification ?

Allowable size of granular material in subgrade is 50 mm

7.What is the maximum Liquid Limit & Plasticity Index allowed in earth work in embankment/subgrade soil ?

Clay should have Liquid Limit less than 50 % & PI should always be less than 25 %.

8.What is the frequency of taking core for BM/DBM/BC for checking of compaction & thickness of laid layer as per MORT&H 5th revision ?

One core at 700 m²

9.What is the maximum Aggregate Impact Value of aggregate allowed for Bituminous concrete(BC) work in flexible pavement ?

AIV should not be more than 24%.

10.What is the minimum cement content & maximum W/C ratio for M 25 RCC concrete for moderate condition as per MORT&H 5TH Revision ?

Minimum Cement Content 340 Kg & Maximum W/C ratio is 0.45

11.What is the density frequency of compacted layer in Embankment & subgrade/Shoulder ?

1 set of 10 test for 3000 m² of Embankment / 1 set of10 test for 2000 m² of Subgrade/Shoulder.

12.What is difference between Specific Gravity & Density ?

Bulk density is the ratio between soil weight to the total volume of the soil but Specific Gravity (G) is the ratio of the weight in air of a given volume of soil solids at a stated temperature to the weight in air of an equal volume of distilled water at that temperature . Specific gravity has no unit and it is generally used in design of concrete/bituminous mix.

13.What is the maximum Aggregate Impact Value of aggregate for concrete work ?

45%

14.What is the rate of spray of Prime Coat over WMM ?

0.7 -1.0 kg/m²

15.Which IS code specified the specification of aggregates ?

IS 383-2016

16.How much Kinetic Viscosity of VG 40 bitumen is ?

The Kinematic Viscosity of VG 40 grade bitumen is 400 cst minimum at 135 º C

17.What is the dry density of WMM & GSB material in your project ?

The density of WMM/GSB in our project is 2.23 /2.24 gm/cc

18.What is the minimum cement content & maximum W/C ratio for Pile concrete as per IRC 78 -2014 Cl 709.1.9 ?

 Minimum amount of cement content 400 kg/m³ & maximum W/C ratio is 0.40

19. What will be the minimum cement content as per IRC SP 49 2014 for DLC mix design ?

140 kg / m³

20.How many samples you take for 900 m² of DLC laying ?

3 samples (9 Cubes)

What is the Nominal size of aggregate for grade 1 Bituminous Concrete?

19 mm

What is the maximum limit of FI+EI for Dense Bituminous Macadam as per MORT& H 5th revision ?

Maximum FI+EI limit is 35%

What is setting time RS1 & SS1 Emulsion?

15 to 30 minutes for RS1 & 24 hours for SS1  

How many cube mould required for 110 m³ concrete ?

4 +1+1=6 samples means 18 cubes as IS 456-2000

As per MORT&H 5th revision how many grades of GSB are there?

Six grades are there.