Interview Questions Asked in Top company | L & T | Tata | Shapoorji Pallonji | Jaypee Group | Afcons | Punj Lloyd etc

 Top most interview questions that asked | 

1. What are the concrete Tests ?

- Slump test , compressive strength test , water permeability test , water absorption test .

2. What is guniting ?

- it is a process in which mixture of cement and sand proportion of 1:3 is shooting on concrete surface  

with the help of gun pressure of 2 to 3 kg/cm^2 .

3. Explain what is flashing?

- Flashing is an extended construction that is done to seal and project joints in a building from water penetration. Flashing is installed ar the intersection roofs, walls and parapets.

4. What do you do if any concrete cube fails in 28 days compressive strength test?

- If the concrete cube fails in strength test, I will conduct a core cutter test on concrete and send a report to higher authorities.

5. Initial setting time of cement  -  30 min

   final setting time of cement     - 90 min /and for OPC 600min.

. What is grouting ?

- Grout is the fluid form of concrete which is used to fill the voids.

6. What is the unit weight of steel ?

- the unit weight of steel is 78.5 KN/m^3

7. What is Busting Reinforcement ?

- Reinforcement is needed to resist lateral tensile forces.

8. What is the recommended slump for column ?

- 75- 125mm

9. Compression strength of Brick ?

- First class brick     - 105 kg/cm^2

  Second class brick - 70 kg/cm^2

  Fire brick               - 125 kg/cm^2 

10. Fe-415 steel Grade, 415 indicate what ?

- Tensile Strength of steel.

11. What are the specifications of tamping rod used in cube filling for cube test ?

-IS code 2386 we use, a 16mm steel rod with rounded edge.

12. unit weight of concrete

- for RCC      ~    25 KN/m^3       

& for PCC    ~    24 KN/m^3

13. What is Shear Slump?

Shear slump implies that the concrete mix is deficient in cohesion, it may undergo segregation and bleeding and thus is undersirable for durability of concrete.

14. Curing method :-  

-  *ponding          *sprinkling 

   * spraying         *stream curing 

  * covering          *curing with chemical

15. What is hybrid Foundation ?

- Hybrid Foundation is usually used for high rise building, it contains both soil supported mat and piles,

settlement amount reduces.

16. volume of cement bag ( 50 kg)

- 0.0347 m^3  or  1.23CFT

17. Standard sand now used in India is obtained from ?

- Ennore ( Madras )

18. function of stirrups in beam?

- Resist shear Force

19. Expiry date of cement ?

- 3 months 

20. What are the steps involved in Building Construction ?

- Excavation, PCC, footing foundation, plinth beam, earth filling plinth, DPC, column construction, Brick wall Construction, stair casting, beam and slab casting, flooring, plastering, pointing and finishing, electrical fittings, plumbing fittings, painting work.

21. What is unit Weight of RCC?

- 2500 kg/m^3

22. Size of hook and angle ?

- Hook = 10 d

  angle = 135 desree

23. Which test is conducted to determine the bearing capacity of soil?

- Plate load test.

24. bleeding meaning ;

- Bleeding is form of segregation in which water comes out to the surface of concrete

25. What is Full form of EIA ?

- Environment Impact Asssessment.

26.In cantilever beam where is tension and compression zone 

- upper side ~ tension  ,    

  mid side ~ neutral        

   bottom side   ~  compression 

   hook at lower side means at compression 

27. Minimum hook length as per IS code ?

- 75mm.

28. What is the extra length in bent up bars ?

- 0.45X.

29. What is foundation provided what are types of foundation ?

- Foundation is provided in order to safely distribute the load of structure in the soil .

  Shallow and Deep foundation 

30. How do You measure the volume of concrete?

- The volume of concrete is calculated by multiplying its length, width and thickness together.

31. 1 Acre = ________ sq.ft

- 43560 sq.ft

32. Bitumen test is conducted on which construction material ?

- Ring and Ball test.

33. When we need pile foundation

- Pile foundation is adopted when the soil bearing capacity is less than 24KN/m^3

34. What is floating slab foundation ?

- Floating concrete foundation is a type of mat foundation that consists of the hollow mat formed by a grid of thick reinforced concrete walls between two thick reinforced concrete slabs.

35. Which instrument used for level work on site ?

- Dumpy Level.

36. Standard height of each floor ?

- 3m

37. Full form of AAC ?

- Autoclaved Aerated Concrete.

38. What do you mean by honeycomb in concrete ?

- Honeycomb, also known as air pocket, is nothing but air voids in concrete. 

39. Why concrete cover is provided to reinforcement ?

- Concrete cover for reinforcement is required to protect the rebar against corrosion and to provide resistance against fire.

40. Calculation weight of steel bar ?

- D^2 X2 / 162 

41. Steel structures what is permissible vertical defection ?

- span / 325

42. What is the minimum Reinforcement in slabs ?

-0.12% of gross area.

43. What is the minimum reinforcement in columns?

- o.8 % of area.

44. What is the maximum reinforcement in columns?

- 4%

45. How do you calculate weight of 10mm dia. and 12m length steel bars on-site?

- Weight = Unit Weight X Length

             = [D^2/162] x12

            = [10^2/162] x 12

            = 0.617 x 12

            = 7.4 kg.

46. What are the standard American codes for steel and concrete?

 - ACI and AISC.

47. First class brick should not absorb water more then ?

- It should not absorb more then 20%.

48. How many hours should CBR samples be soaked ?

- 96 Hrs.

49. What is the Difference between built area and super built up area ?

- * Built up area : It includes carpet area + walls , ducts and pillars 

and it 10% more then carpet area 

 * Super built up area : it includes your built up area + area that we use as building like passage to lift, gym, club, stair.

50. What is the slop of stair case ?

- As per IS 456-2000, (25 to 40 degree)

51. What is the maximum fresh concrete temperature until used as per ASTM ?

- 32°C

52. Minimum grade of concrete used for RCC ?

- M20

53. How to do check level on construction site ?

- Spirit level, Dumpy level and Leveling pipe

54. shuttering removing time ?

- Side of wall , column and outer side of beam  - 24 to 48 hr

- beam soffit      - 7 days

- Slab                 - 3 days

- Removal of props of slab -    

          span  >  6m  - 21 days

          span <= 6m  - 14 days

55. The portion of a brick cut across the width is called?

- Bat.

56. For filling crack in masonry structures, the types of bitumen used is ?

- Plastic bitumen.

57. What is 53 in Cement 53 - Grade?

- It indicated strength of cement 53 n/mm^2.

58. What are the common ways of demolition ?

- * Hydro- demolition

  *Dismantling

  * Pressure Bursting

59. Maximum free fall of concrete allowed is ?

- 1.5m.

60. What do you understand by M20 concrete ?

- According to IS 456:2000, M refers mix and 20 refers characteristic compressive.

concrete cube is give strength after 28days should min 26 n/sqmm 

61. The device used for changing the direction of the engines is called ?

- Turn table.

62. What is the accuracy of the dumpy level or minimum reading we can take?

- With the help of a dumpy level we can take up 5mm accurate reading or minimum reading.

63. What is the process of covering of concrete placed on the exposed top of an external wall?

- Coping.

64. What is full form of UTM ?

- Universal Testing Machine.

65. Full form of 1 BHK ?

- 1 bed room , 1 hall , 1 kitchen

66. What is the size of a concrete cube ?

- 150mmx150mmx150mm.

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