74 + Interview Questions in Aggregates And Testing Of Aggregates in Concrete Technology Page 2 InterviewSolution

51.	Crushed stone, gravel and ordinary sand are examples of ___________(a) Lightweight aggregate(b) Normal-weight aggregate(c) Heavy-weight aggregate(d) Both Normal-weight aggregate and Heavy-weight aggregateThe question was posed to me in my homework.I need to ask this question from Classification of Aggregates in division Aggregates and Testing of Aggregates of Concrete Technology
Answer» Right answer is (b) NORMAL-weight AGGREGATE To explain: Crushed STONE, gravel and ordinary sand are examples of normal weight aggregate. They are commonly used in manufacture of normal weight concrete, asphalt concrete and roadway sub-base.

Discussion

52.	Aggregates to be used for wearing course, the impact value shouldn’t exceed __________ percent.(a) 30(b) 35(c) 40(d) 25I had been asked this question during an interview for a job.My question is based upon Mechanical Properties of Aggregates topic in division Aggregates and Testing of Aggregates of Concrete Technology
Answer» Correct option is (a) 30 The best I can explain: Aggregates to be used for wearing COURSE, the IMPACT value shouldn’t exceed 30 %. For bituminous macadam the maximum permissible value is 35 %.

Discussion

53.	Aggregates to be used for wearing course, the impact value shouldn’t exceed ________ percent.(a) 30(b) 35(c) 40(d) 25This question was posed to me in an international level competition.I need to ask this question from Testing of Aggregates topic in division Aggregates and Testing of Aggregates of Concrete Technology
Answer» The correct CHOICE is (a) 30 Explanation: Aggregates to be used for WEARING course, the impact VALUE shouldn’t exceed 30 %. For bituminous macadam the maximum permissible value is 35 %.

Discussion

54.	If the Y is the reading of sand surface (ml) then what is the percentage of bulking?(a) % of bulking {(200/Y)-2} x 100(b) % of bulking {(200/Y)-1} x 100(c) % of bulking {(100/Y)-2} x 100(d) % of bulking {(100/Y)-1} x 100I had been asked this question during an internship interview.The query is from Soundness of Aggregates in division Aggregates and Testing of Aggregates of Concrete Technology
Answer» The correct choice is (b) % of bulking {(200/Y)-1} x 100 Easiest explanation: % of bulking {(200/Y)-1} x 100. Report the percentage bulking of the SAND to the NEAREST whole NUMBER.

Discussion

55.	Expansion should not be more than _____________(a) 5mm(b) 10mm(c) 5cm(d) 10cmI had been asked this question during an interview.This intriguing question originated from Soundness of Aggregates in portion Aggregates and Testing of Aggregates of Concrete Technology
Answer» The correct option is (b) 10mm To explain I would say: The difference between the TWO READINGS INDICATES the expansion of CEMENT and it should not exceed 10 MM.

Discussion

56.	Generally heavy weight aggregate obtained from ______________(a) Minerals ores(b) Palm oil shell(c) Sand(d) Crushed stoneI have been asked this question in an international level competition.This is a very interesting question from Source of Aggregates in portion Aggregates and Testing of Aggregates of Concrete Technology
Answer» The correct choice is (a) Minerals ORES To elaborate: The UNIT weight of HEAVY weight CONCRETE varies from 2400kg/m^3 with sp.gr range from 4.0 to 4.6 (mineral ores and barite).

Discussion

57.	The standard sand now a days used in India, is obtained from _________(a) Ennore (Madras)(b) Jaipur(c) Jullundur (Punjab)(d) HyderabadThe question was posed to me in an online quiz.The question is from Source of Aggregates topic in chapter Aggregates and Testing of Aggregates of Concrete Technology
Answer»

Discussion

58.	If 60% aggregates doesn’t pass through the 2.36mm sieve, then what would be the value of Aggregate impact value?(a) 60%(b) 40%(c) 25%(d) 100%The question was asked in an internship interview.This key question is from Testing of Aggregates in chapter Aggregates and Testing of Aggregates of Concrete Technology
Answer» Right choice is (b) 40% The explanation is: AGGREGATE impact VALUE = (W1/W2)100 = {(100-60)/100} 100 = 40%.

Discussion

59.	The specific heat of the aggregates is _____________(a) The ability to conduct the heat(b) The ability to insulate the heat(c) Is a measure of its heat capacity(d) Same as thermal conductivityI have been asked this question in exam.This intriguing question comes from Thermal Properties topic in division Aggregates and Testing of Aggregates of Concrete Technology
Answer» Correct choice is (C) Is a measure of its heat capacity To elaborate: The SPECIFIC heat of the aggregates is a measure of its heat capacity and THERMAL conductivity is to conduct the heat.

Discussion

60.	Why do we need to find soundness?(a) To detect the uncombined lime in cement(b) To detect the combined lime in cement(c) To detect the combined alumina in cement(d) To detect the uncombined alumina in cementThis question was posed to me in unit test.My enquiry is from Soundness of Aggregates topic in section Aggregates and Testing of Aggregates of Concrete Technology
Answer» The correct answer is (a) To detect the uncombined lime in cement The BEST EXPLANATION: SOUNDNESS Test on Cement. Soundness Test onCement is CARRIED out to detect the presence of uncombined lime in cement.

Discussion

61.	If h = height of sand when moist and h1 is the height when saturated then what is the percentage of bulking?(a) {(h-h1)/h1}100(b) {(h1-h)/h1}100(c) {(h-h1)/h}100(d) {(h1-h)/h}100I got this question in final exam.Question is from Bulking of Aggregates in division Aggregates and Testing of Aggregates of Concrete Technology
Answer» RIGHT CHOICE is (a) {(h-H1)/h1}100 The best I can explain: It is the formula to calculate the PERCENTAGE of bulking. Percentage in bulking = {(h-h1)/h1}100.

Discussion

62.	What is void ratio?(a) 1 – (bulk density/apparent sp gr)(b) (bulk density/apparent sp gr) – 1(c) 1 – bulk density/apparent sp gr(d) bulk density/apparent sp gr – 1The question was posed to me during an interview.Question is taken from Strength of Aggregates in chapter Aggregates and Testing of Aggregates of Concrete Technology
Answer» The correct choice is (a) 1 – (BULK density/apparent sp gr) EASY explanation: The EMPTY space between the aggregates particles are TERMED as voids. And the CORRESPONDING ratio will be calculated by the given formula.

Discussion

63.	What are artificial aggregates?(a) Those who obtained from river beds(b) Those who are manufactured naturally(c) Those who are mechanically obtained(d) Who has smooth surfaceI got this question in an online interview.I would like to ask this question from Source of Aggregates topic in chapter Aggregates and Testing of Aggregates of Concrete Technology
Answer»

Discussion

64.	A maximum value of ___ percent is allowed for WBM base course in Indian conditions.(a) 25(b) 35(c) 40(d) 50I got this question in unit test.This is a very interesting question from Mechanical Properties of Aggregates in portion Aggregates and Testing of Aggregates of Concrete Technology
Answer» Correct choice is (c) 40 To explain I WOULD say: A maximum value of 40%AGE is ALLOWED for WBM base course in Indian conditions.

Discussion

65.	Fine sand bulks __________ than coarse sand.(a) Less(b) More(c) Equal(d) Depends on volumeI got this question in an online quiz.The query is from Bulking of Aggregates topic in section Aggregates and Testing of Aggregates of Concrete Technology
Answer» The CORRECT CHOICE is (b) More The explanation is: Fine SAND bulks more as compared to coarse sand, i.e. percentage of bulking in INDIRECTLY proportional to the size of particle.

Discussion

66.	Generally rounded aggregates are the example of natural aggregates.(a) True(b) FalseThis question was addressed to me in exam.I would like to ask this question from Source of Aggregates topic in chapter Aggregates and Testing of Aggregates of Concrete Technology
Answer» Right option is (a) True Explanation: Natural AGGREGATE are those from the river beds, river sand and ex-mines. They are generally NORMALLY ROUNDED in SHAPE and have smooth surface texture.

Discussion

67.	Coefficient of thermal expansion of concrete is __________ coefficient of thermal expansion in aggregates.(a) Directly proportional(b) Inversely proportional(c) Equal(d) More thanThis question was posed to me by my college director while I was bunking the class.I would like to ask this question from Thermal Properties topic in portion Aggregates and Testing of Aggregates of Concrete Technology
Answer» Correct choice is (a) Directly proportional Best EXPLANATION: Coefficient of THERMAL EXPANSION of concrete increases with the INCREASE in coefficient of thermal expansion of AGGREGATES and vice-versa.

Discussion

68.	What is bulking of coarse aggregates?(a) More than sand(b) Less than sand(c) Equal than sand(d) NegligibleThe question was posed to me in a job interview.This intriguing question originated from Bulking of Aggregates in division Aggregates and Testing of Aggregates of Concrete Technology
Answer» Right CHOICE is (d) Negligible Explanation: Bulking is INDIRECTLY PROPORTIONAL to the particle size of the AGGREGATES. Size of COARSE aggregates is more hence negligible bulking.

Discussion

69.	S.I. unit of bulk density is?(a) kg/l(b) g/ml(c) kg/ml(d) g/lThe question was asked by my college professor while I was bunking the class.My question comes from Strength of Aggregates in chapter Aggregates and Testing of Aggregates of Concrete Technology
Answer» CORRECT option is (a) kg/l To explain: Bulk density of an aggregate is DEFINED as the mass of MATERIAL in a GIVEN VOLUME and expressed in kg/l.

Discussion

70.	Which machine is preferred for abrasion test?(a) Vicat’s mould(b) Los Angeles(c) Flakiness Gauge(d) Elongation GaugeThe question was asked in an interview for internship.I need to ask this question from Testing of Aggregates topic in portion Aggregates and Testing of Aggregates of Concrete Technology
Answer» Right option is (b) Los ANGELES The EXPLANATION: Los Angeles is preffered for ABRASION test for carrying out the HARDNESS PROPERTY and has been standardized in India.

Discussion

71.	The thermal conductivity of the aggregates is ______________(a) The ability to conduct the heat(b) The ability to insulate the heat(c) Is a measure of its heat capacity(d) Same as thermal conductivityI had been asked this question in an international level competition.Question is taken from Thermal Properties topic in section Aggregates and Testing of Aggregates of Concrete Technology
Answer» The correct answer is (a) The ABILITY to conduct the heat Easy EXPLANATION: THERMAL CONDUCTIVITY is the ability of the AGGREGATES to conduct the heat.

Discussion

72.	The bulk density of aggregates does not depend upon ____________(a) Size and shape of aggregates(b) Specific gravity of aggregates(c) Grading of aggregates(d) Size and shape of the containerI had been asked this question in a national level competition.I need to ask this question from Source of Aggregates topic in section Aggregates and Testing of Aggregates of Concrete Technology
Answer» Correct choice is (d) SIZE and shape of the container Explanation: BULK density is DEPENDS on the PROPERTIES of the aggregates not of the container. Size, shape, Specific gravity, grading are the properties of aggregates.

Discussion

73.	Aggregate crushed before the application of full load of ___________(a) 10ton(b) 20ton(c) 30ton(d) 40tonI have been asked this question during an internship interview.My enquiry is from Classification of Aggregates topic in portion Aggregates and Testing of Aggregates of Concrete Technology
Answer» The correct choice is (d) 40ton Easiest explanation: Aggregate CRUSHED before the application of full LOAD of 40ton, the WEAKER MATERIAL become compacted, so that the amount of crushing in later stage of the test is reduced.

Discussion

74.	According to size, aggregates is/are classified into __________ types.(a) 1(b) 2(c) 3(d) 4I have been asked this question in an online quiz.This intriguing question comes from Classification of Aggregates in section Aggregates and Testing of Aggregates of Concrete Technology
Answer» The correct option is (d) 4 The explanation is: There are 4 types of AGGREGATES based on SIZE. They are FINE aggregates, coarse aggregates, all in aggregates and single size aggregates.

Discussion

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Expansion should not be more than _____________(a) 5mm(b) 10mm(c) 5cm(d) 10cmI had been asked this question during an interview.This intriguing question originated from Soundness of Aggregates in portion Aggregates and Testing of Aggregates of Concrete Technology

The standard sand now a days used in India, is obtained from _________(a) Ennore (Madras)(b) Jaipur(c) Jullundur (Punjab)(d) HyderabadThe question was posed to me in an online quiz.The question is from Source of Aggregates topic in chapter Aggregates and Testing of Aggregates of Concrete Technology

A maximum value of ___ percent is allowed for WBM base course in Indian conditions.(a) 25(b) 35(c) 40(d) 50I got this question in unit test.This is a very interesting question from Mechanical Properties of Aggregates in portion Aggregates and Testing of Aggregates of Concrete Technology

Fine sand bulks __________ than coarse sand.(a) Less(b) More(c) Equal(d) Depends on volumeI got this question in an online quiz.The query is from Bulking of Aggregates topic in section Aggregates and Testing of Aggregates of Concrete Technology

Generally rounded aggregates are the example of natural aggregates.(a) True(b) FalseThis question was addressed to me in exam.I would like to ask this question from Source of Aggregates topic in chapter Aggregates and Testing of Aggregates of Concrete Technology

What is bulking of coarse aggregates?(a) More than sand(b) Less than sand(c) Equal than sand(d) NegligibleThe question was posed to me in a job interview.This intriguing question originated from Bulking of Aggregates in division Aggregates and Testing of Aggregates of Concrete Technology

S.I. unit of bulk density is?(a) kg/l(b) g/ml(c) kg/ml(d) g/lThe question was asked by my college professor while I was bunking the class.My question comes from Strength of Aggregates in chapter Aggregates and Testing of Aggregates of Concrete Technology

Aggregate crushed before the application of full load of ___________(a) 10ton(b) 20ton(c) 30ton(d) 40tonI have been asked this question during an internship interview.My enquiry is from Classification of Aggregates topic in portion Aggregates and Testing of Aggregates of Concrete Technology

According to size, aggregates is/are classified into __________ types.(a) 1(b) 2(c) 3(d) 4I have been asked this question in an online quiz.This intriguing question comes from Classification of Aggregates in section Aggregates and Testing of Aggregates of Concrete Technology