20 interview questions for civil engineering

Question-1:What is hydration?

Answer: Hydration is the reaction between cement and water.

Question-2: What is curing of concrete?

Answer: Curing is the application of water to the concrete surface for the proper hydration to occur.

Question-3: What are the methods of curing?

Answer: Generally water is applied by various means. The common methods of curing are:

·         Spraying

·         Wet Covering of surface

·         Ponding

·         Steam Curing

·         Application of curing compounds/admixtures

Question-4: For the quality control of cement what tests are done?

Answer: The tests that are required to check the quality of cement are–

·         Initial and Final Setting time

·         Consistency

·         Tensile strength

·         Soundness

Question-5: What may be the mix proportion for M10 grade concrete?

Answer: Cement: Sand: Aggregate = 1:3:6

Question-6: When the possibility of segregation is much?

Answer: Segregation of concrete may occur if the concrete mix is-

·         If the mix is too wet

·         If the ratio of coarser aggregate is much more thatn the others proportions

·         Coarser grading

Question-7: What happens to ordinary cement after casting?

Answer: Ordinary cement shrinks after drying.

Question-8: With what compounds of cement the hydration takes place?

Answer: Silicates( Tricalcium Silicate and Dicalcium silicate),Tricalcium aluminate,tricalcium alumino ferrite

Question-9: When an aggregate may be called as flaky?

Answer: When the least dimension of the aggregate is less than 60%, Then the aggeregate may call as flaky.

Question-10: Why Vicat’s apparatus is used?

Answer: To determine the Consistency of cement vicats apparatus is used.

                                                                             Vicat Apparatus- consistency measuring

Question-11: What are least cover dimensions for different structural member?

Answer:

Footing : Minimum 50mm

column : Minimum 40mm

beam : Minimum 25mm

slab : Minimum 20mm

Question-12:  Why I section Beams are preferred?

Answer: I-section is prefered beacuse-

·         it provides large stiffness in lateral direction

·         It has large Moment of inertia.

·         I section has the lowest shape factor.

Question-13: What is shuttering?

Answer: To place the permanent structure a temporary structure of specifird shape and dimension is builtt on the site which is termed as shuttering.

Question-14: What is the difference between deflection and deformation?

Answer: Deflection is a temporary displacement where as deformation is a permanent displacement.

Question-15: What is meant by open-graded aggregates?

Answer: Open graded aggregates are the aggregates that have the coarser size aggregates and as a result the concrete produces more air voids.

Question-16: What is coping?

Answer: Coping is a arrangement of wall to protect the wall from water and environment.

Question-17: What is the specific gravity of cement?

Answer: 3.15(in general)

Question-18: What is development length?

Answer: Development length is an embedded extra length .

Question-19: What is the differences between working stress method and limit state design method?

Answer: Working stress method considers the elasticity of the materials and never  loaded beyond the elastic limit where as limit state design is based on plastic method.

Question-20: What is meant by TMT bar?

Answer: TMT means Thermo Mechanicaly Treated. This bar has higher strength and higher corrosion resistance to the exposed environment