121 + Interview Questions in Special Concrete And Concreting Methods in Concrete Technology Page 3 InterviewSolution

101.	Higher resin dosage is recommended when using ________(a) Coarse aggregate(b) Fine aggregates(c) All in one aggregates(d) More cementThis question was addressed to me by my college director while I was bunking the class.This is a very interesting question from Factors Affecting PIC, Cold Weather Concreting in division Special Concrete and Concreting Methods of Concrete Technology
Answer» Right option is (B) Fine aggregates The BEST I can explain: Higher resin dosage is recommended when USING fine AGGREGATE, because of the presence of the large surface area of the materials.

Discussion

102.	What is the width of the flat sheet fibers after silting in mm?(a) .3-.5(b) .25(c) .15-.41(d) .25-.90This question was addressed to me in an online quiz.This interesting question is from Sulphur Infiltrated Concrete, FRC topic in division Special Concrete and Concreting Methods of Concrete Technology
Answer» RIGHT ANSWER is (d) .25-.90 To ELABORATE: 0.25 mm to 0.90 mm is the width of the flat sheet FIBERS PRODUCED by silting of flat sheets.

Discussion

103.	What is the bending strength of this concrete?(a) 60-115 MPa(b) 10-16 MPa(c) 35-50 GPa(d) 500 GPaThis question was posed to me in a job interview.My doubt is from Sulphur Infiltrated Concrete, FRC topic in division Special Concrete and Concreting Methods of Concrete Technology
Answer» RIGHT option is (b) 10-16 MPa To explain I would SAY: 10-16 MPa is the bending strength of the Sulphur Infiltered CONCRETE where as OPC has 6-7 MPa.

Discussion

104.	Which of the following are the disadvantages of this concrete?(a) Lightweight(b) Low strength(c) Low shrinkage(d) Good thermal insulating propertyThis question was addressed to me in homework.This key question is from No Fines Concrete, High Density Concrete topic in portion Special Concrete and Concreting Methods of Concrete Technology
Answer» Right answer is (B) Low STRENGTH The BEST explanation: The main disadvantage of this concrete is that it has very low strength as compared to ORDINARY PORTLAND cement.

Discussion

105.	SCC is measured using the _________(a) Picat’s apparatus(b) Slump-flow test(c) Slump test(d) Standard Consistency TestI have been asked this question during an internship interview.My query is from Complexity in Special Concrete, India in SCC in chapter Special Concrete and Concreting Methods of Concrete Technology
Answer» CORRECT OPTION is (b) Slump-flow test Explanation: SCC is measured using Slump flow test rather than usual slump test, as it is too fluid to KEEP its shape when the cone is REMOVED from it.

Discussion

106.	After vacuum mixing, the volumetric shrinkage can be raised from 3–5% to __________ % in different cements.(a) 1-2(b) 3-5(c) 5-7(d) 6-8The question was asked by my college director while I was bunking the class.My question is from Hot Weather Concreting, Prepacked and Vacuum Cement topic in portion Special Concrete and Concreting Methods of Concrete Technology
Answer» The correct ANSWER is (c) 5-7 To explain: The volumetric shrinkage can be raised from 3–5 % to 5-7 % in different CEMENTS after MIXING vacuum into it.

Discussion

107.	_______ cement content to avoid shrinkage cracking due to temperature cycle in mass concrete.(a) Minimum(b) Nominal(c) .5(d) MaximumThe question was asked during an online interview.This interesting question is from Mix Design topic in section Special Concrete and Concreting Methods of Concrete Technology
Answer» CORRECT option is (d) MAXIMUM The explanation: Maximum CEMENT content to avoid shrinkage cracking due to temperature cycle in mass concrete. It gives adequate DURABILITY for the particular site condition.

Discussion

108.	When the concrete in fresh stage is exposed to freeze before certain pre-hardening period, compressive strength may get __________(a) Increased to 50%(b) Decreased to 50%(c) Increased to 25%(d) Decreased to 25%The question was posed to me during an interview.I'm obligated to ask this question of Factors Affecting PIC, Cold Weather Concreting topic in chapter Special Concrete and Concreting Methods of Concrete Technology
Answer» The correct option is (b) Decreased to 50% To EXPLAIN: When the concrete in fresh stage is exposed to freeze before a certain prehardening period, concrete may suffer LOSS in its prop. to an extent that COMPRESSIVE STRENGTH may get decreased to 50%.

Discussion

109.	Concrete is not recommended to be placed at a temperature below __________^oC.(a) 2(b) 3(c) 4(d) 5I have been asked this question in homework.Origin of the question is Factors Affecting PIC, Cold Weather Concreting in portion Special Concrete and Concreting Methods of Concrete Technology
Answer» Correct option is (d) 5 To ELABORATE: Any concreting OPERATION done at a temperature below 5^oC is TERMED as COLD weather concreting.

Discussion

110.	_______ % is the range for porosity of this concrete.(a) 1-4(b) 5(c) 0-1(d) 9-15I got this question in quiz.My doubt is from Sulphur Infiltrated Concrete, FRC in portion Special Concrete and Concreting Methods of Concrete Technology
Answer» RIGHT answer is (a) 1-4 The best I can EXPLAIN: 1 % to 4% is the range for porosity of sulphur infiltered CONCRETE and 9% to 15 % is the range for OPC.

Discussion

111.	Density of no fines concrete with normal aggregate vary from _________ kg/m^3.(a) 1600-1900(b) 2500(d) >300I have been asked this question during an internship interview.My question is from No Fines Concrete, High Density Concrete in section Special Concrete and Concreting Methods of Concrete Technology
Answer» The correct OPTION is (a) 1600-1900 To explain: The range of the DENSITY of no fines aggregates with the normal aggregates VARY from 1600-1900 kg/m^3.

Discussion

112.	Light weight cement content for compressive strength 4000 psi is _______ pounds per cubic yard.(a) 740-840(b) 440-560(c) 530-660(d) 630-750This question was addressed to me in an internship interview.This intriguing question originated from Structural Light Weight Concrete in division Special Concrete and Concreting Methods of Concrete Technology
Answer» Right option is (c) 530-660 Best EXPLANATION: Light WEIGHT CEMENT CONTENT for compressive strength 4000 psi is 530-660 pounds PER cubic yard and 400-510 is for compressive strength 2500 psi.

Discussion

113.	Diameter of Round Steel Fiber lies in the range of ________ mm.(a) .3-.5(b) .25-.75(c) .155-.41(d) .25-.90This question was posed to me in class test.I would like to ask this question from Special Concrete in portion Special Concrete and Concreting Methods of Concrete Technology
Answer» The correct choice is (b) .25-.75 Easy explanation: Round steel fiber are COMMONLY USED and produced by CUTTING round wire into the SHORT length. The diameter lies in the range of 0.25mm to 0.75mm.

Discussion

114.	Entrainment of air also improves workability and durability.(a) True(b) FalseThe question was asked in examination.My query is from Special Concrete in chapter Special Concrete and Concreting Methods of Concrete Technology
Answer» Right OPTION is (a) True The EXPLANATION is: Entrainment of air also IMPROVES workability and durability to produce such concrete which would have resistance to WEATHERING actions.

Discussion

115.	Which test can be performed without skilled labor?(a) Probe test(b) Bend liquid test(c) Dye penetrant test(d) Torsion testThis question was posed to me during an interview.My question is from Various Testing Methods in section Special Concrete and Concreting Methods of Concrete Technology
Answer» The correct CHOICE is (c) Dye penetrant test To explain I WOULD say: Dye penetrant test does not require any skilled labor. This method only detects surface discontinuities and this test needs to be OBSERVED with naked eyes or with low magnifying GLASS.

Discussion

116.	Vacuum mixing systems reduce the exposure by _________ %.(a) 20(b) 40(c) 50(d) 10This question was posed to me in unit test.I'd like to ask this question from Hot Weather Concreting, Prepacked and Vacuum Cement topic in division Special Concrete and Concreting Methods of Concrete Technology
Answer» CORRECT CHOICE is (c) 50 Easy explanation: Vacuum mixing SYSTEM decreases the exposure by 50 % to 70% and eliminates the CONTACT with the bone cement while delivery.

Discussion

117.	Concrete is not recommended to be placed at a temperature above _________^oC.(a) 20(b) 30(c) 40(d) 50The question was asked during an online interview.Question is taken from Hot Weather Concreting, Prepacked and Vacuum Cement topic in chapter Special Concrete and Concreting Methods of Concrete Technology
Answer» Right choice is (C) 40 To explain I would say: Any operation of concreting done at ATMOSPHERIC temperature above 40 ^OC MAY be put under hot weather concreting.

Discussion

118.	What is the 10 day bending failure stress in N/mm^2?(a) 40(b) 1500(c) 3.4(d) 180I got this question in unit test.I need to ask this question from Concrete Cloth, Polymer Impregnated Concrete topic in chapter Special Concrete and Concreting Methods of Concrete Technology
Answer» Correct option is (c) 3.4 Easiest explanation: This test is BASED on BS EN 12467:2004 and the 10 day BENDING failure STRESS is 3.4 N/mm^2.

Discussion

119.	The w/c ratio is kept in the range of_______(a) .1-.2(b) .38-.52(c) .83-1(d) .25-.38This question was addressed to me in quiz.My doubt stems from No Fines Concrete, High Density Concrete in division Special Concrete and Concreting Methods of Concrete Technology
Answer» CORRECT choice is (b) .38-.52 For explanation I would SAY: The water cement ratio is kept within the range of 0.38-0.52. The water cement ratio should be chosen very carefully considering the cohesive nature of the MATERIALS which we are USING.

Discussion

120.	Does this reduce handling time?(a) True(b) FalseI got this question in class test.This interesting question is from Hot Weather Concreting, Prepacked and Vacuum Cement in division Special Concrete and Concreting Methods of Concrete Technology
Answer» Correct option is (a) True The best explanation: A HIGHER temperature of fresh CONCRETE results in a more rapid hydration of cement and leads to reduced workability/ accelerated setting. This REDUCES the HANDLING time of concrete.

Discussion

121.	What is the value of modulus of elasticity for Sulphur infiltered concrete?(a) 60-115 MPa(b) 10-16 MPa(c) 35-50 GPa(d) 500 GPaThis question was posed to me in unit test.Enquiry is from Special Concrete in division Special Concrete and Concreting Methods of Concrete Technology
Answer» CORRECT OPTION is (c) 35-50 GPa For explanation: 35-60 GPa is the range of modulud of elasticity for the SULPHUR infiltered concrete WHEREAS the OPC has the range of 25-28 GPa.

Discussion

Explore topic-wise InterviewSolutions in .

What is the bending strength of this concrete?(a) 60-115 MPa(b) 10-16 MPa(c) 35-50 GPa(d) 500 GPaThis question was posed to me in a job interview.My doubt is from Sulphur Infiltrated Concrete, FRC topic in division Special Concrete and Concreting Methods of Concrete Technology

Concrete is not recommended to be placed at a temperature below __________^oC.(a) 2(b) 3(c) 4(d) 5I have been asked this question in homework.Origin of the question is Factors Affecting PIC, Cold Weather Concreting in portion Special Concrete and Concreting Methods of Concrete Technology

_______ % is the range for porosity of this concrete.(a) 1-4(b) 5(c) 0-1(d) 9-15I got this question in quiz.My doubt is from Sulphur Infiltrated Concrete, FRC in portion Special Concrete and Concreting Methods of Concrete Technology

Diameter of Round Steel Fiber lies in the range of ________ mm.(a) .3-.5(b) .25-.75(c) .155-.41(d) .25-.90This question was posed to me in class test.I would like to ask this question from Special Concrete in portion Special Concrete and Concreting Methods of Concrete Technology

Entrainment of air also improves workability and durability.(a) True(b) FalseThe question was asked in examination.My query is from Special Concrete in chapter Special Concrete and Concreting Methods of Concrete Technology

Which test can be performed without skilled labor?(a) Probe test(b) Bend liquid test(c) Dye penetrant test(d) Torsion testThis question was posed to me during an interview.My question is from Various Testing Methods in section Special Concrete and Concreting Methods of Concrete Technology

Vacuum mixing systems reduce the exposure by _________ %.(a) 20(b) 40(c) 50(d) 10This question was posed to me in unit test.I'd like to ask this question from Hot Weather Concreting, Prepacked and Vacuum Cement topic in division Special Concrete and Concreting Methods of Concrete Technology

What is the 10 day bending failure stress in N/mm^2?(a) 40(b) 1500(c) 3.4(d) 180I got this question in unit test.I need to ask this question from Concrete Cloth, Polymer Impregnated Concrete topic in chapter Special Concrete and Concreting Methods of Concrete Technology

The w/c ratio is kept in the range of_______(a) .1-.2(b) .38-.52(c) .83-1(d) .25-.38This question was addressed to me in quiz.My doubt stems from No Fines Concrete, High Density Concrete in division Special Concrete and Concreting Methods of Concrete Technology

Does this reduce handling time?(a) True(b) FalseI got this question in class test.This interesting question is from Hot Weather Concreting, Prepacked and Vacuum Cement in division Special Concrete and Concreting Methods of Concrete Technology

What is the value of modulus of elasticity for Sulphur infiltered concrete?(a) 60-115 MPa(b) 10-16 MPa(c) 35-50 GPa(d) 500 GPaThis question was posed to me in unit test.Enquiry is from Special Concrete in division Special Concrete and Concreting Methods of Concrete Technology