25 + Interview Questions in Basics Of Structural Design in Design Of Steel Structures Page 1 InterviewSolution

1.	The partial factor of safety for resistance governed by ultimate strength is :(a) 1.10(b) 1.5(c) 2.0(d) 1.25The question was asked in an online quiz.The doubt is from Limit State Method in section Basics of Structural Design of Design of Steel Structures
Answer» Right OPTION is (d) 1.25 For explanation: Partial factor of safety for resistance GOVERNED by ultimate strength is 1.25. Factors affecting ultimate strength are stability, fatigue and plastic collapse. The loads are multiplied or RESISTANCES are divided by this factor to GET DESIGN values.

Discussion

2.	The partial factor of safety for resistance governed by yielding is :(a) 1.10(b) 1.5(c) 2.0(d) 1.25I got this question by my school principal while I was bunking the class.I would like to ask this question from Limit State Method in section Basics of Structural Design of Design of Steel Structures
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Discussion

3.	Which of the following criteria is to be satisfied in selection of member in limit state method?(a) Factored Load > Factored Strength(b) Factored Load ≤ Factored Strength(c) Factored Load ≥ Factored Strength(d) Sometimes Factored Load < Factored Strength (or) Factored Load > Factored StrengthThe question was posed to me during an interview.Origin of the question is Limit State Method topic in section Basics of Structural Design of Design of Steel Structures
Answer» Correct CHOICE is (b) FACTORED Load ≤ Factored STRENGTH Easy explanation: Limit Sate method is also KNOWN as load and resistance FACTOR design. Load factors are applied to service loads and then theoretical strength of member is reduced by application of resistance factor.The criteria is to be satisfied in selection of member in limit state method is factored load ≤ factored strength.

Discussion

4.	Which of the following relation is correct?(a) Design Strength = Ultimate strength + Partial factor of safety(b) Design Strength = Ultimate strength – Partial factor of safety(c) Design Strength = Ultimate strength /Partial factor of safety(d) Design Strength = Ultimate strength x Partial factor of safetyI got this question in exam.This intriguing question comes from Limit State Method in chapter Basics of Structural Design of Design of Steel Structures
Answer» The correct choice is (c) Design Strength = Ultimate strength /Partial factor of safety Easiest explanation: Design Strength = Ultimate strength /Partial factor of safety. This partial safety factor accounts for possibility of unfavourable deviation of MATERIAL strength from characteristic VALUE, variation of member sizes, REDUCTION in member strength due to fabrication and tolerances and UNCERTAINTY in CALCULATION of strength of members.

Discussion

5.	Which of the following relation is correct?(a) Design Load = Characteristic Load(b) Design Load = Characteristic Load + Partial factor of safety(c) Design Load = Characteristic Load / Partial factor of safety(d) Design Load = Characteristic Load x Partial factor of safetyI have been asked this question during a job interview.Origin of the question is Limit State Method in portion Basics of Structural Design of Design of Steel Structures
Answer» Correct choice is (d) Design LOAD = Characteristic Load x Partial factor of safety To explain I would say: Design Load = Partial factor of safety x Characteristic Load. This partial safety factor ACCOUNTS for possibility of unfavourable deviation of load from characteristic VALUE, inaccurate assessment of load, UNCERTAINTY in assessment of effects of load and in assessment of limit STATE being considered.

Discussion

6.	What is variable action according to classification of actions by IS code?(a) due to self weight(b) due to accidents(c) due to construction and service stage loads(d) due to earthquake loadsThe question was asked in examination.Question is from Limit State Method in section Basics of Structural Design of Design of Steel Structures
Answer» Correct choice is (c) due to construction and service STAGE loads Easiest explanation: VARIABLE ACTIONS are actions due to construction and service stage loads such as IMPOSED loads, wind loads, earthquake loads, ETC.

Discussion

7.	What is permanent action according to classification of actions by IS code?(a) due to self weight(b) due to construction and service stage loads(c) due to accidents(d) due to earthquake loadsI have been asked this question in class test.This intriguing question originated from Limit State Method in division Basics of Structural Design of Design of Steel Structures
Answer» Right option is (a) due to self WEIGHT To explain I would say: PERMANENT ACTIONS are actions due to self weight of structural and non structural components, fittings, ancillaries, FIXED EQUIPMENTS etc.

Discussion

8.	Which of the following factors is included in the limit state of serviceability?(a) Brittle facture(b) Fracture due to fatigue(c) Failure by excessive deformation(d) Deformation and deflection adversely affecting appearance or effective use of structureThe question was asked at a job interview.Enquiry is from Limit State Method in chapter Basics of Structural Design of Design of Steel Structures
Answer» Right ANSWER is (d) Deformation and deflection adversely affecting appearance or effective use of structure The best I can explain: Limit state of serviceability INCLUDES (i) deformation and deflection adversely affecting appearance or effective use of structure, (ii) vibrations in structure or any PART of its compound limiting its functional EFFECTIVENESS, (iii) repairable repair or crack due to fatigue, (iv) corrosion, (v) fire.

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9.	Which of the following factors is included in the limit state of strength?(a) Fire(b) Failure by excessive deformation(c) Corrosion(d) Repairable damage or crack due to fatigueI got this question during an internship interview.I want to ask this question from Limit State Method in section Basics of Structural Design of Design of Steel Structures
Answer» Correct answer is (b) Failure by EXCESSIVE deformation To explain: Limit state of strength are prescribed to avoid collapse of structure which MAY endanger safety of LIFE and property. It INCLUDES (i) loss of equilibrium of whole or part of structure, (II) loss of stability of structure as a whole or part of structure, (iii) failure by excessive deformation, (iv) fracture due to fatigue , (v) brittle fracture.

Discussion

10.	Which of the following format is used in limit state method?(a) Single safety factor(b) Multiple safety factor(c) Load factor(d) Wind factorI had been asked this question in an interview for internship.Query is from Limit State Method topic in portion Basics of Structural Design of Design of Steel Structures
Answer» Correct ANSWER is (b) Multiple safety factor Easiest explanation: Limit state method uses multiple safety factor format that helps to PROVIDE adequate safety at ULTIMATE loads and adequate serviceability at service loads, by considering all possible limit states. Multiple safety factor format is ALSO called partial safety factor format.

Discussion

11.	What is limit state?(a) Acceptable limits for safety and serviceability requirements before failure occurs(b) Acceptable limits for safety and serviceability requirements after failure occurs(c) Acceptable limits for safety after failure occurs(d) Acceptable limits for serviceability after failure occursI have been asked this question by my college director while I was bunking the class.This question is from Limit State Method topic in chapter Basics of Structural Design of Design of Steel Structures
Answer» The correct option is (a) Acceptable limits for safety and serviceability REQUIREMENTS before FAILURE occurs The BEST explanation: Acceptable limits for safety and serviceability requirements before failure occurs is called limit state. In Limit State design, structures are designed on the BASIS of safety against failure and are CHECKED for serviceability requirements.

Discussion

12.	Limit State Method is based on _____________(a) calculations on service load conditions alone(b) calculations on ultimate load conditions alone(c) calculations at working loads and ultimate loads(d) calculations on earthquake loadsI had been asked this question in an interview.I'd like to ask this question from Limit State Method topic in section Basics of Structural Design of Design of Steel Structures
Answer» The correct answer is (c) calculations at WORKING loads and ultimate loads For explanation: Working stress method is based on calculations on service load conditions alone. Ultimate STRENGTH method is based on calculations on ultimate load conditions alone. In LIMIT STATE method, safety at ultimate loads and serviceability at working loads are considered.

Discussion

13.	How much percentage increase of permissible stress is allowed when dead load, live load and wind load are considered together in working stress method?(a) 50%(b) 33%(c) 40%(d) 60%This question was posed to me in homework.My doubt is from Design Considerations, Analysis & Methods topic in section Basics of Structural Design of Design of Steel Structures
Answer» RIGHT answer is (b) 33% The EXPLANATION: In WORKING stress method, working stress ≤ permissible stress. Stress due to dead LOAD + live load ≤ permissible stress Stress due to dead load + WIND load ≤ permissible stress Stress due to dead load + live load + wind load ≤ 1.33 permissible stress.

Discussion

14.	What is Load Factor?(a) ratio of working load to ultimate load(b) product of working load and ultimate load(c) product of working load and factor of safety(d) ratio of ultimate load to working loadThis question was posed to me in an online interview.This interesting question is from Design Considerations, Analysis & Methods in section Basics of Structural Design of Design of Steel Structures
Answer» Correct ANSWER is (d) RATIO of ULTIMATE load to working load Explanation: Load Factor = working load / ultimate load. In ultimate load design, different types of loads and load COMBINATIONS have different load factors assigned.

Discussion

15.	Which of the following are subjected to both axial loads and bending moments?(a) Beam-Column(b) Column(c) Lattice member(d) BeamI have been asked this question in my homework.This question is from Design Considerations, Analysis & Methods in section Basics of Structural Design of Design of Steel Structures
Answer» The CORRECT option is (a) Beam-Column Best EXPLANATION: BEAMS are those elements which are subjected to bending moments and shear force only. COLUMNS are subjected to axial loads. Beam-Column is subjected to axial LOAD and bending moment. In special cases, beams are subjected to torsional moments.

Discussion

16.	Which of the following is not a main element of framed structure?(a) Beam(b) Column(c) Shear connector(d) Lattice memberI got this question by my college director while I was bunking the class.I would like to ask this question from Design Considerations, Analysis & Methods in portion Basics of Structural Design of Design of Steel Structures
Answer» The correct option is (c) SHEAR connector To elaborate: For FRAMED STRUCTURE, the main elements are BEAM, column, beam-column, TIE and lattice members.

Discussion

17.	In Working Stress Method, which of the following relation is correct?(a) Working Stress ≤ Permissible Stress(b) Working Stress ≥ Permissible Stress(c) Working Stress = Permissible Stress(d) Working Stress > Permissible StressThis question was posed to me in my homework.My question comes from Design Considerations, Analysis & Methods in portion Basics of Structural Design of Design of Steel Structures
Answer» Correct answer is (a) WORKING STRESS ≤ Permissible Stress The best I can explain: In Working Stress METHOD, Working Stress ≤ Permissible Stress. Each member is checked for NUMBER of different combinations of loadings.

Discussion

18.	Which of the following relation is correct?(a) Permissible Stress = Yield Stress x Factor of Safety(b) Permissible Stress = Yield Stress / Factor of Safety(c) Yield Stress = Permissible Stress /Factor of Safety(d) Permissible Stress = Yield Stress – Factor of SafetyThis question was addressed to me in unit test.The question is from Design Considerations, Analysis & Methods topic in section Basics of Structural Design of Design of Steel Structures
Answer» The correct answer is (b) Permissible STRESS = Yield Stress / Factor of SAFETY The best I can EXPLAIN: Permissible Stress = Yield Stress / Factor of Safety. Permissible Stress is the AMOUNT of stress that will not cause failure. It is a fraction of yield stress. It takes care of overload or other unknown factors.

Discussion

19.	Which of the following is one of the methods of analysis prescribed in the code for steel structures?(a) Hinge Analysis(b) Limit Analysis(c) Roller Analysis(d) Dynamic AnalysisI got this question in quiz.This intriguing question originated from Design Considerations, Analysis & Methods topic in portion Basics of Structural Design of Design of Steel Structures
Answer» CORRECT choice is (d) Dynamic Analysis For explanation I would say: Code suggests the use of any of the following methods for steel structures : (i) elastic analysis, (II) PLASTIC analysis, (iii) advanced analysis, (iv) dynamic analysis.

Discussion

20.	Which method is mainly adopted for design of steel structures as per IS code?(a) Limit State Method(b) Working Stress Method(c) Ultimate Load Method(d) Earthquake Load MethodThis question was addressed to me in quiz.I'm obligated to ask this question of Design Considerations, Analysis & Methods in portion Basics of Structural Design of Design of Steel Structures
Answer» Correct choice is (a) Limit State METHOD To explain: Steel structures and their elements are normally designed by limit state method. When limit state method cannot be conveniently ADOPTED, working STRESS method may be used.

Discussion

21.	Which IS code is used for general construction of steel?(a) IS 456(b) IS 256(c) IS 800(d) IS 100I have been asked this question during an interview.Origin of the question is Design Considerations, Analysis & Methods topic in division Basics of Structural Design of Design of Steel Structures
Answer» Right choice is (c) IS 800 The best I can EXPLAIN: IS 800:2007 is the CODE of practice for general construction in STEEL. It is issued by Bureau of Indian Standards.

Discussion

22.	The structure is statically indeterminate when________________(a) static equilibrium equations are insufficient for determining internal forces and reactions on that structure(b) static equilibrium equations are sufficient for determining internal forces and reactions on that structure(c) structure is economically viable(d) structure is environment friendlyThe question was posed to me in an online interview.Question is from Design Considerations, Analysis & Methods in chapter Basics of Structural Design of Design of Steel Structures
Answer» Right ANSWER is (a) STATIC equilibrium equations are INSUFFICIENT for determining internal forces and REACTIONS on that structure The explanation: When the static equilibrium equations are insufficient for determining internal forces and reactions on that structure, the structure is said to be statically indeterminate. ANALYSIS of these structures is complex and cannot be analysed only by using laws of statics, various analytical methods like slope deflection method, moment distribution method, etc.

Discussion

23.	Which of the following is correct criteria to be considered while designing?(a) Structure should be aesthetically pleasing but structurally unsafe(b) Structure should be cheap in cost even though it may be structurally unsafe(c) Structure should be structurally safe but less durable(d) Structure should be adequately safe, should have adequate serviceabilityThis question was addressed to me in an interview.The query is from Design Considerations, Analysis & Methods topic in section Basics of Structural Design of Design of Steel Structures
Answer» The correct answer is (d) Structure should be adequately safe, should have adequate SERVICEABILITY Best EXPLANATION: Structure should be designed such that it fulfils it intended purpose during its lifetime and be adequately safe in terms of STRENGTH, stability and structural integrity and have adequate serviceability. Structure should also be ECONOMICALLY viable, aesthetically pleasing and environment FRIENDLY.

Discussion

24.	What is serviceability?(a) It refers to condition when structure is not usable(b) It refers to services offered in the structure(c) It means that the structure should perform satisfactorily under different loads, without discomfort to user(d) It means that structure should be economically viableThis question was addressed to me in final exam.My enquiry is from Design Considerations, Analysis & Methods in chapter Basics of Structural Design of Design of Steel Structures
Answer» The CORRECT choice is (c) It means that the structure should perform satisfactorily under different loads, without discomfort to user For explanation I would say: SERVICEABILITY is related to utility of structure. The structure should perform satisfactorily under SERVICE loads, without discomfort to user due to excessive DEFLECTION, cracking, vibration, etc. Other considerations of serviceability are durability, impermeability, acoustic and thermal insulation etc.

Discussion

25.	Analysis is referred to _____________(a) determination of cost of structure(b) determination of axial forces, bending moment, shear force etc.(c) determination of factor of safety(d) drafting architectural plans and drawingsThe question was asked in an online quiz.This interesting question is from Design Considerations, Analysis & Methods topic in division Basics of Structural Design of Design of Steel Structures
Answer» The correct choice is (b) determination of axial forces, bending moment, shear FORCE etc. To explain I WOULD SAY: Analysis refers to determination of axial forces, bending moment, shear force, torsional moments etc. acting on different members of structure due to applied loads and their COMBINATIONS.

Discussion

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The partial factor of safety for resistance governed by ultimate strength is :(a) 1.10(b) 1.5(c) 2.0(d) 1.25The question was asked in an online quiz.The doubt is from Limit State Method in section Basics of Structural Design of Design of Steel Structures

The partial factor of safety for resistance governed by yielding is :(a) 1.10(b) 1.5(c) 2.0(d) 1.25I got this question by my school principal while I was bunking the class.I would like to ask this question from Limit State Method in section Basics of Structural Design of Design of Steel Structures

Which IS code is used for general construction of steel?(a) IS 456(b) IS 256(c) IS 800(d) IS 100I have been asked this question during an interview.Origin of the question is Design Considerations, Analysis & Methods topic in division Basics of Structural Design of Design of Steel Structures