Civil Engineering

# Basic Questions asked in Civil Engineering Interview from IS Codes

## Basic Questions asked in Civil Engineering Interview from IS Codes

### Basic Questions asked in Civil Engineering Interview from IS Codes.

The IS Codes is important for the Civil Engineers as they provide the client whose construction work is to be executed form of assurance & security. All construction works are executed as per reference of the IS codes. Every country has its own codes that specifies the execution & quality of the work. As The Civil Engineers, it is necessary to study Indian Standard (I.S) Codes by which execution of the work will be as per the standard quality.

So here are some Basic Question that are mostly asked in an interview. If u are a fresher & going for an interview so u should remind these questions with answer that are as follows.

Q-1. What is the Tension & Compression zone in Cantilever Beam?

Answer: In Cantilever Beam, the Tension zone is located above the Neutral Axis & the Compression zone is located below the Neutral Axis.

Q-2. What is the Rolling Margin Tolerance for the Nominal mass for a 25 m diameter bar?

Answer:Â Â As per IS 1786, the Rolling Margin Tolerance for the Nominal mass for 25 m diameter bar is Â±3 %.

Q-3. What is the Standard Length of the Steel Bar taken for Rolling Margin?

Answer: The Standard Length of Steel Bar taken for Rolling Margin at the Construction site is 1 metre.

Q-4. Which grade of the concrete is considered as HSC (High Strength Concrete)?

Answer: As per IS 456: 2000 [Table â€“ 2], the grade of the concrete considered as HSC (High Strength Concrete) is M65, M70, M75, M80, M85, M90, M95, and M100.

Q-5. What is the number of the concrete cube samples taken for 6-15 cubic meter concrete?

Answer: As per IS 456: 2000 [Clause â€“ 15.2.2], the number of the concrete cube samples taken for 6-15 cubic meter concrete is 2, which consists of 6 concrete cubes.

Â [NOTE: 1 samples = 3 test specimens = 3 concrete cube]

Q-6. What is the reference IS code used for the Bend Test of the Steel bar?

Answer:Â Â The reference IS code used for the Bend Test of the Steel bar is IS 1599.

Q-7. What is the angle for the Bending of steel bar for Bend test?

Answer:Â Â As per IS 1599, the angle for the Bending of the steel bar for the Bend test is 180 degrees.

Q-8. What is the allowable maximum percentage of Carbon in the manufacturing of the TMT (Thermo Mechanically Treated) Bar?

Answer: As per [IS 1786, Clause- 3.2], the allowable maximum percentage of the Carbon in the manufacturing of TMT (Thermo Mechanically Treated) Bar is 0.25 %.

Q-9. What is the diameter of the Mandrel used for the Bend Test of Fe 500 for diameter 20 mm?

Answer:Â Â As per IS 1786, the diameter of the Mandrel used for the Bend Test of Fe 500 for diameter 20 mm is 4Î¦, where Î¦ is the diameter of bar.

Q-10. What is the full form of â€˜BOQâ€™?

Answer: The full form of â€˜BOQâ€™ is Bill of the Quantities.

Q-11. What is the Fine Aggregate?

Answer:Â Â As per IS 383, Aggregate most of which passes 4.75 mm IS Sieve.

Q-12. What is the Coarse Aggregate?

Answer:Â Â As per IS 383, Aggregate most of which retained on 4.75 mm IS Sieve.

Q-13. What is the minimum curing period for Super Sulphate Cement?

Answer: The minimum curing period for the Super Sulphate Cement is 7 days.

Q-14. What is the maximum and minimum tolerance for concrete cube characteristics compressive strength result?

Answer: As per IS 456: 2000 [Clause â€“ 15.4], the maximum & minimum tolerance for concrete cube characteristics compressive strength result is +15% and -15%.

Q-15. What is All in Aggregate?

Answer:Â Â As per IS 383, Material composed of both fine aggregate & coarse aggregate is known as All-in-Aggregate.

2. ### Thumb Rules For Cement Masonry and Plastering Quantity

Q-16. What is the Anchorage Length?

Answer: As per IS Code 13920: 2016, Clause â€“ 6.2.5, Anchorage length equals to development length of the bar in tension and plus ten times bar diameter minus the allowance for 90 degrees bend.

Q-17. What is the maximum percentage dosage of the retarder we can use?

Answer: As per IS 456: 2000 [Clause â€“ 10.3.3], the maximum percentage dosage of the retarder we can use is 0.5 percent by weight of cementitious materials.

Q-18. What is the minimum quantity of the cement required for M25 grade of concrete for Moderate condition?

Answer: As per IS 456: 2000 [Table-5], the minimum quantity of the cement required for M25 grade of concrete for Moderate condition is 300 kg/ãŽ¥

Q-19. What is the maximum quantity of the cement we can use per cubic meter of concrete?

Answer: As per IS 456: 2000 [Clause â€“ 8.2.4.2], the maximum quantity of cement we can use per cubic meter of concrete is 450 kg. Cement content not including fly ash & ground granulated blast furnace slag in excess of 450 kg/ãŽ¥ should not be used unless special consideration has been given in design to the increased risk of cracking due to drying shrinkage in thin sections, or to early thermal cracking and to the increased risk of damage due to alkali-silica reactions

Q-20. What is the Effective depth of the beam?

Answer:Â Â As per IS 456: 2000 [Clause â€“ 23], Effective depth of a beam is the distance between the centroid of the area of tension reinforcement and the maximum compression fiber, excluding the thickness of finishing material not placed monolithically with the member & the thickness of any concrete provided to allow for wear. This will not apply to deep beams.

Q-21. Which grade of the concrete termed as Nominal Mix Design?

Answer:Â As per IS 456: 2000 [Clause â€“ 9.3], Nominal Mix Concrete may be used for concrete of M20 or Lower.

Q-22. Which IS code specified for Mandrel diameter for Bend and Re bend test?

Answer: The IS code specified for Mandrel diameter for Bend and Re bend test is IS 1786.

Q-23. What is the minimum curing period required when we use blended cement in the construction?

Answer:Â Â As per IS 456: 2000 [Clause â€“ 13.5.1], the minimum curing period required when we use mineral admixtures or blended cement in the construction is 10 days.

Q-24. What is the angle for the Bending of the steel bar for the Re bend test?

Answer:Â Â For the Re bend test, Initially bend the bar to an included angle of 135 degrees. Keep it in boiling water at 100 degrees for 30 minutes. Then cool it down for some time. After cooling bent it back to an included angle of 157.5 degrees.

Q-25. What is the maximum percentage dosage of the plasticizers we can use?

Answer:Â Â As per IS 456: 2000 [Clause â€“ 10.3.3], the maximum percentage dosage of the plasticizers we can use is 1.0 percent by weight of cementitious materials.

Q-26. What is the standard Diameter of the Tremie Pipe?

Answer: As per IS 456: 2000 [Clause â€“ 14.2.4(a)], The tremie pipe shall be not less than 200 mm in diameter & shall be large enough to allow a free flow of concrete and strong enough to withstand the external pressure of the water in which it is suspended, even if a partial vacuum develops inside the pipe.

Q-27. What should be the spacing considered when we use coupler in a longitudinal reinforcement bar?

Answer: As per IS Code 13920: 2016, Clause â€“ 6.2.6.2 (b), The spacing between adjacent longitudinal bars shall be based also on the outer size of the coupler to allow easy flow of the concrete.

Q-28. What is the Slump value for the Pumped concrete?

Answer:Â As per IS 456: 2000 [Clause â€“ 7.1], the Slump value for Pumped concrete is (75 â€“ 100) mm.

Q-29. What is the allowable tolerance for the Concrete Cover size?

Answer: As per IS 456: 2000 [Clause â€“ 12.3.2], the Actual concrete cover should not deviate from the required nominal cover by +ten mm and -0 mm.

Q-30. Which is the most important IS code for the Civil Engineer?

Answer:Â IS 456 gives specifications about plain reinforcement concrete. For designing any concrete structure, this IS code is important.