56 + Interview Questions in Testing Of Concrete in Concrete Technology Page 1 InterviewSolution

1.	An ultrasonic pulse velocity test is an _____________(a) Ex-situ, nondestructive test(b) In-situ, nondestructive test(c) Ex-situ, destructive test(d) In-situ, destructive testI got this question in an online interview.Asked question is from Pulse Velocity Test topic in division Testing of Concrete of Concrete Technology
Answer» CORRECT CHOICE is (b) In-situ, nondestructive test The explanation: An ULTRASONIC pulse velocity test is an in-situ, nondestructive test to check the QUALITY of concrete and natural ROCKS.

Discussion

2.	A second name for compression wave is __________(a) Longitudinal wave(b) Shear wave(c) Surface wave(d) Lamb waveI have been asked this question in a national level competition.This key question is from Pulse Velocity Test in portion Testing of Concrete of Concrete Technology
Answer» Correct CHOICE is (d) Lamb wave To EXPLAIN: Lamb WAVES are SIMILAR to longitudinal waves, with compression and rarefaction, but they are bounded by the sheet or PLATE surface causing a wave-guide effect.

Discussion

3.	A discontinuity that occurs during the casting of molten metal which may be caused by the splashing, surging, interrupted pouring is ___________(a) Burst(b) Cold shut(c) Flaking(d) Blow holeI had been asked this question in exam.The question is from Pulse Velocity Test in chapter Testing of Concrete of Concrete Technology
Answer» The correct answer is (b) Cold SHUT The best I can explain: A discontinuity that occurs during the casting of molten metal which may be caused by the splashing, SURGING, interrupted pouring, or the meeting of two streams of metal COMING from different DIRECTIONS is called cold shut.

Discussion

4.	Higher velocities indicate __________(a) Good quality and continuity of the material(b) Bad quality and continuity of the material(c) Concrete with many cracks(d) Concrete with many voidsThe question was asked in exam.My query is from Pulse Velocity Test in chapter Testing of Concrete of Concrete Technology
Answer» Right CHOICE is (a) GOOD quality and continuity of the MATERIAL The explanation: Higher velocities indicate good quality and continuity of the material, while SLOWER velocities may indicate concrete with many cracks or voids.

Discussion

5.	When the motion of the particles of a medium are at right angles to the direction of wave motion, the wave being transmitted is called a ___________(a) Longitudinal wave(b) Shear wave(c) Surface wave(d) Lamb waveI had been asked this question in a job interview.The doubt is from Pulse Velocity Test topic in division Testing of Concrete of Concrete Technology
Answer» The correct answer is (a) Longitudinal wave Easiest explanation: When the motion of the PARTICLES of a medium are at RIGHT ANGLES to the direction of wave motion, the wave being TRANSMITTED is called a longitudinal wave.

Discussion

6.	In this test, the strength and quality of concrete or rock is assessed by measuring the ___ of an ultrasonic pulse.(a) Length(b) Velocity(c) Weight(d) Surface TensionI had been asked this question during an online interview.This interesting question is from Pulse Velocity Test topic in portion Testing of Concrete of Concrete Technology
Answer» The CORRECT answer is (b) VELOCITY The best I can explain: In this test, the strength and quality of concrete or ROCK is assessed by measuring the velocity of an ultrasonic pulse PASSING through a concrete structure or natural rock formation.

Discussion

7.	Mechanical pulse having an oscillation frequency in range of `_____________(a) 30 kHz to 40 kHz(b) 40 kHz to 50 kHz(c) 50 kHz to 60 kHz(d) 60 kHz to 70 kHzThe question was posed to me during an internship interview.Question is taken from Pulse Velocity Test in portion Testing of Concrete of Concrete Technology
Answer» Correct ANSWER is (b) 40 kHz to 50 kHz The EXPLANATION: Mechanical PULSE having an OSCILLATION FREQUENCY in range of 40000 Hz to 50000 Hz.

Discussion

8.	The interference field near the face of a transducer is often referred to as the ______________(a) Fresnel zone(b) Acoustic impedance(c) Exponential field(d) Phasing zoneI got this question in my homework.This intriguing question comes from Pulse Velocity Test in portion Testing of Concrete of Concrete Technology
Answer» Right ANSWER is (a) Fresnel zone The explanation is: Radio FREQUENCY LINE of sight is defined by Fresnel ZONES which are ellipse shaped areas between any two radios.

Discussion

9.	Slower velocities may indicate ___________(a) Good quality and continuity of the material(b) Good quality and discontinuity of the material(c) Bad quality and continuity of the material(d) Concrete with many voidsI had been asked this question in a national level competition.My question comes from Pulse Velocity Test in section Testing of Concrete of Concrete Technology
Answer» The correct option is (d) Concrete with many VOIDS The explanation is: Slower velocities MAY INDICATE concrete with many cracks or voids, while HIGHER velocities indicate good QUALITY and continuity of the material.

Discussion

10.	The number of cylces per second is the definition of ____________(a) Wave speed(b) Frequency(c) Hertz(d) VelocityThe question was asked in class test.The doubt is from Pulse Velocity Test in division Testing of Concrete of Concrete Technology
Answer» The CORRECT choice is (c) Hertz Explanation: One hertz (Hz) stands for one cycle per second and it is the SI unit of frequency. VELOCITY means DISPLACEMENT COVERED per second.

Discussion

11.	What is a destructive test?(a) Destructive tests are applications for detecting flaws in materials without impairing their usefulness(b) Destructive tests are applications for detecting flaws that impair the use of the materials such as pressure testing(c) Destructive tests are applications for detecting flaws in materials with impairing their usefulness(d) Destructive tests are applications for detecting flaws that do not impair the use of the materials such as pressure testingI got this question in my homework.The doubt is from Destructive and Non-Destructive Tests in portion Testing of Concrete of Concrete Technology
Answer» The correct answer is (b) DESTRUCTIVE TESTS are applications for detecting FLAWS that IMPAIR the USE of the materials such as pressure testing Easiest explanation: Destructive tests are applications for detecting flaws that impair the use of materials such as pressure testing.

Discussion

12.	Which among the following is the last step in magnetic particle test method?(a) Observation and inspection(b) Circular magnetization(c) Demagnetization(d) MagnetizationI have been asked this question by my college professor while I was bunking the class.The above asked question is from Destructive and Non-Destructive Tests in chapter Testing of Concrete of Concrete Technology
Answer» Right answer is (c) DEMAGNETIZATION Explanation: Different steps involved in magnetic PARTICLE TEST are cleaning the surface, magnetizing the metallic COMPONENT, APPLICATION of ferromagnetic powder, observation and inspection and demagnetization.

Discussion

13.	For hardness test of copper in Brinell hardness tester, the diameter of ball is ___________(a) 7mm(b) 1mm(c) 5mm(d) 3mmThis question was posed to me during an internship interview.The question is from Compression Test topic in portion Testing of Concrete of Concrete Technology
Answer» Correct OPTION is (c) 5mm Explanation: ASTM E-10 is a standard TEST for determining the Brinell HARDNESS of metallic materials. The load applied in this test is usually 3,000, 1,500, or 500 KGF, so that the diameter of the INDENTATION is 5 mm.

Discussion

14.	Tensile test can be performed on _____________(a) Impact testing machine(b) Universal testing machine(c) Rockwell tester(d) Brinell testerThe question was asked during a job interview.My query is from Compression Test topic in division Testing of Concrete of Concrete Technology
Answer» The correct option is (B) UNIVERSAL testing machine For explanation: TENSILE testing, also KNOWN as TENSION testing, is a fundamental material science test in which a sample is subjected to a controlled tension until failure.

Discussion

15.	Ring tensile strength is __________(a) Proportional to time(b) Inversely proportional to time(c) Inversely proportional to hydrostatic pressure(d) Inversely proportional to average diameter of ringI had been asked this question in semester exam.I want to ask this question from Ring Tension Test topic in division Testing of Concrete of Concrete Technology
Answer» Correct ANSWER is (b) Inversely PROPORTIONAL to time For explanation I would say: fr = PD/2t where P = hydrostatic PRESSURE, D= AVERAGE diameter of RING, t = time.

Discussion

16.	What is equivalent flexural strength?(a) The stress value obtained when the peak load value is used in the equation of modulus of rupture(b) The stress value representing the average flexural strength in the post peak region up to a specified deflection of L/n obtained when Pe,n is used in the equation of modulus of rupture(c) The load value representing the average load-carrying capacity in the post peak region up to a specified deflection of L/n(d) Value of the mean equivalent flexural strength normalized with respect to mean flexural strengthThe question was asked during an interview for a job.My doubt stems from Flexural Strength of Concrete in division Testing of Concrete of Concrete Technology
Answer» RIGHT choice is (b) The stress value representing the AVERAGE flexural strength in the post PEAK region up to a specified deflection of L/n obtained when Pe,n is used in the equation of modulus of rupture Easiest EXPLANATION: The stress value representing the average flexural strength in the post peak region up to a specified deflection of L/n obtained when Pe,n is used in the equation of modulus of rupture is called EQUIVALENT flexural strength.

Discussion

17.	The slump would not exceed 50 mm when compacting concrete with vibrators.(a) True(b) FalseI have been asked this question in an interview for job.The above asked question is from Curing of Hardened Concrete topic in portion Testing of Concrete of Concrete Technology
Answer» Right choice is (a) True Explanation: Segregation means concrete CEMENT slurry & FINE aggregates &COARSE aggregate collapsed & have no slump & after hardening no strength but WORKABILITY is the CHECKING the concrete how much time used after mixing.

Discussion

18.	Ring test is the determination for ___________(a) Compressive strength(b) Tensile strength(c) Both Compressive and tensile strength(d) Flexural strengthThe question was asked in class test.Query is from Ring Tension Test topic in division Testing of Concrete of Concrete Technology
Answer» Correct choice is (B) Tensile strength Best EXPLANATION: Malhotra REINTRODUCED another technique, the RING test, for determination of Tensile strength.

Discussion

19.	What is nondestructive test?(a) Nondestructive tests are applications for detecting flaws in materials without impairing their usefulness(b) Nondestructive tests are applications for detecting flaws that impair the use of the materials such as pressure testing(c) Nondestructive tests are applications for detecting flaws in materials with impairing their usefulness(d) Nondestructive tests are applications for detecting flaws that do not impair the use of the materials such as pressure testingThis question was posed to me by my college professor while I was bunking the class.This is a very interesting question from Destructive and Non-Destructive Tests in section Testing of Concrete of Concrete Technology
Answer» The correct option is (a) NONDESTRUCTIVE TESTS are applications for detecting FLAWS in MATERIALS without impairing their usefulness To explain: Nondestructive tests are applications for detecting flaws in materials without impairing their usefulness.

Discussion

20.	What is equivalent flexural strength ratio?(a) The stress value obtained when the peak load value is used in the equation of modulus of rupture(b) The stress value representing the average flexural strength in the post peak region up to a specified deflection of L/n obtained when Pe,n is used in the equation of modulus of rupture(c) The load value representing the average load-carrying capacity in the post peak region up to a specified deflection of L/n(d) Value of the mean equivalent flexural strength normalized with respect to mean flexural strengthI had been asked this question during an internship interview.My enquiry is from Flexural Strength of Concrete topic in section Testing of Concrete of Concrete Technology
Answer»

Discussion

21.	Calipers, capable of reading the dimensions of test specimens to an accuracy of ____________(a) 1mm(b) .1mm(c) 10mm(d) .5mmI have been asked this question in an interview.My doubt is from Flexural Strength of Concrete topic in division Testing of Concrete of Concrete Technology
Answer» The correct CHOICE is (b) .1mm The explanation: CALIPERS, capable of reading the dimensions of TEST specimens to an accuracy of 0.1 mm.

Discussion

22.	The final operation of finishing the concrete surface is called _____________(a) Screeding(b) Floating(c) Troweling(d) CompactingThe question was asked in an internship interview.My question comes from Curing of Hardened Concrete in section Testing of Concrete of Concrete Technology
Answer» Correct ANSWER is (C) Troweling To EXPLAIN I would say: The final operation of finishing the concrete surface is called Troweling.

Discussion

23.	The indenter used in Brinell hardness test is a ____________(a) Ball(b) Cone(c) Cylinder(d) PyramidThe question was asked during an online exam.I would like to ask this question from Compression Test in chapter Testing of Concrete of Concrete Technology
Answer» Correct choice is (B) Cone Easiest EXPLANATION: The Brinell method applies a predetermined test load (F) to a carbide BALL of FIXED DIAMETER (D) which is held for a predetermined time period and then removed.

Discussion

24.	Which machine records the change in length of specimen?(a) Impact testing machine(b) Universal testing machine(c) Rockwell tester(d) Brinell testerThe question was posed to me during an interview.Enquiry is from Compression Test in chapter Testing of Concrete of Concrete Technology
Answer» RIGHT choice is (b) Universal testing machine The explanation is: A universal testing machine (UTM), also known as a universal tester, MATERIALS testing machine or materials test FRAME, is used to test the TENSILE strength and compressive strength of materials.

Discussion

25.	At least 30 __________ of crosshead travel or more for high elongation materials.(a) cm(b) inches(c) mm(d) mI got this question in an interview for internship.My doubt is from Ring Tension Test in portion Testing of Concrete of Concrete Technology
Answer» The correct CHOICE is (B) inches Explanation: At least 30 inches of CROSSHEAD travel or more for high elongation MATERIALS.

Discussion

26.	For compacting large sections of mass concrete in structures, the type of vibrator used is ________________(a) Internal vibrator(b) External vibrator(c) Screed vibrator(d) Internal and Screed vibratorI had been asked this question in a national level competition.The question is from Curing of Hardened Concrete in division Testing of Concrete of Concrete Technology
Answer» CORRECT CHOICE is (a) Internal vibrator The best I can explain: For COMPACTING LARGE sections of mass concrete in structures, the type of vibrator used is internal vibrator.

Discussion

27.	Which among the following is not a type of Non-destructive testing?(a) Compression test(b) Visual testing(c) Ultrasonic testing(d) Eddy current testingThis question was addressed to me during an interview for a job.I'm obligated to ask this question of Destructive and Non-Destructive Tests in chapter Testing of Concrete of Concrete Technology
Answer» Correct option is (a) Compression TEST Explanation: Compression test is a type of destructive TESTING. This test is used to determine behavior of metals under compressive load. Visual testing, ULTRASONIC testing, eddy current testing are TYPES of non-destructive testing.

Discussion

28.	The construction joints in cement concrete ___________(a) Should be located where bending moment is large(b) Should be located where shear force is large(c) Should not be provided at the corners(d) Should be spaced at a distance of 3 m apart in case of huge structuresThis question was posed to me by my school teacher while I was bunking the class.The doubt is from Curing of Hardened Concrete topic in division Testing of Concrete of Concrete Technology
Answer» Correct CHOICE is (C) Should not be PROVIDED at the corners Explanation: The CONSTRUCTION joints in cement concrete should not be provided at the corners.

Discussion

29.	After the curing of 28 days, the concrete gains strength upto _____________(a) 40%(b) 60%(c) 80%(d) 100%I have been asked this question during an online exam.The doubt is from Curing of Hardened Concrete topic in section Testing of Concrete of Concrete Technology
Answer» The correct choice is (d) 100% The BEST explanation: After the CURING of 28 days, the CONCRETE gains strength upto 100 PERCENTAGE.

Discussion

30.	The process of hardening the concrete mixes by keeping its surface moist for a certain period is called ____________(a) Curing(b) Floating(c) Troweling(d) CompactingI had been asked this question in an internship interview.Origin of the question is Curing of Hardened Concrete in division Testing of Concrete of Concrete Technology
Answer» CORRECT CHOICE is (a) Curing To EXPLAIN: The process of HARDENING the concrete mixes by keeping its surface moist for a CERTAIN period is called curing.

Discussion

31.	The levelling operation that removes humps and hollows and give a true, uniform concrete surface is called ____________(a) Screeding(b) Floating(c) Troweling(d) CompactingThe question was asked in examination.My doubt is from Curing of Hardened Concrete topic in portion Testing of Concrete of Concrete Technology
Answer» Right option is (a) Screeding For explanation I would SAY: The levelling operation that REMOVES HUMPS and hollows and give a TRUE, uniform concrete SURFACE is called Screeding.

Discussion

32.	Most small and common ___________ load capacity machines will work for the loads of the materials tested to this specification.(a) 1N(b) 1KN(c) 10N(d) 10KNI got this question in an interview for job.My enquiry is from Ring Tension Test in section Testing of Concrete of Concrete Technology
Answer» Right answer is (b) 1KN For explanation: Most small and common 1kN (225 pound) load CAPACITY MACHINES will work for the loads of the MATERIALS TESTED to this specification.

Discussion

33.	Which of the following statements is/are true for the ultrasonic test?(a) Equipment used for ultrasonic testing is portable(b) Complicated shapes can be easily scanned(c) Waves generated are health hazardous(d) Waves generated are health hazardous and complicated shapes can be easily scannedThis question was addressed to me in examination.My question is taken from Destructive and Non-Destructive Tests topic in chapter Testing of Concrete of Concrete Technology
Answer» Correct option is (a) Equipment used for ultrasonic testing is portable For explanation: Ultrasonic test uses sound waves of HIGH frequency to detect DISCONTINUITIES. This method is used to detect flaws on the SURFACE and ALSO deep inside the component. The waves TRAVEL in straight line and are reflected from metal gas interface or discontinuities in their patch.

Discussion

34.	Rule (ruler/scale), capable of reading the dimensions of test specimens to an accuracy of ________(a) 1mm(b) .1mm(c) 10mm(d) .5mmThe question was asked at a job interview.Question is from Flexural Strength of Concrete in section Testing of Concrete of Concrete Technology
Answer» Right answer is (a) 1mm To explain: Rule (ruler/scale), CAPABLE of reading the DIMENSIONS of test specimens to an accuracy of 1 MM.

Discussion

35.	When vibrators are used for compaction, the consistency of concrete depends upon the ___________(a) Type of mix(b) Efficiency of vibrator(c) Placing conditions(d) Type of mix, efficiency of vibrator, pacing conditionsI got this question in quiz.My doubt is from Curing of Hardened Concrete in section Testing of Concrete of Concrete Technology
Answer» Right choice is (d) TYPE of mix, EFFICIENCY of vibrator, pacing CONDITIONS The BEST explanation: When vibrators are used for compaction, the consistency of concrete depends UPON the Type of mix, efficiency of vibrator, pacing conditions.

Discussion

36.	What is equivalent flexural load?(a) The stress value obtained when the peak load value is used in the equation of modulus of rupture(b) The stress value representing the average flexural strength in the post peak region up to a specified deflection of L/n obtained when Pe,n is used in the equation of modulus of rupture(c) The load value representing the average load-carrying capacity in the post peak region up to a specified deflection of L/n(d) Value of the mean equivalent flexural strength normalized with respect to mean flexural strengthThis question was posed to me in an interview for internship.This interesting question is from Flexural Strength of Concrete in chapter Testing of Concrete of Concrete Technology
Answer» CORRECT CHOICE is (c) The load VALUE representing the average load-carrying CAPACITY in the post PEAK region up to a specified deflection of L/n Easy explanation: The load value representing the average load-carrying capacity in the post peak region up to a specified deflection of L/n is equivalent flexural load.

Discussion

37.	Which of the following statement is correct while compacting concrete with vibrators?(a) The vibrator should be inserted horizontally(b) The vibrator should not be immersed through a full depth of freshly laid concrete(c) The vibrator should not touch the form surface(d) The vibrator should touch the form surfaceI have been asked this question in an online interview.The question is from Curing of Hardened Concrete in portion Testing of Concrete of Concrete Technology
Answer» Right ANSWER is (C) The vibrator should not touch the form surface Easy explanation: If there is a considerable amount of time lapse between the PLACEMENTS of subsequent LIFTS, it MAY be necessary to re vibrate the previous lift prior to placing additional concrete to minimize the potential for pour lines and cold joints.

Discussion

38.	The tolerances on the cross-section of the test specimens shall be within ± ___________(a) 1%(b) 2%(c) 3%(d) 5%I have been asked this question in an interview for job.Enquiry is from Ring Tension Test topic in division Testing of Concrete of Concrete Technology
Answer» Right OPTION is (b) 2% Explanation: The TOLERANCES on the cross-section of the test specimens SHALL be WITHIN ± 2%.

Discussion

39.	ASTM D1414 (D 1414) covers multiple properties of _____________(a) T ring(b) O ring(c) C ring(d) U ringThe question was posed to me in a job interview.My question is from Ring Tension Test in chapter Testing of Concrete of Concrete Technology
Answer» The correct answer is (b) O ring Explanation: ASTM D1414 (D 1414) covers multiple properties of O-Rings. Part of the SPECIFICATION includes TENSION testing for DETERMINING the breaking force, tensile STRENGTH, and ultimate elongation of an o-ring.

Discussion

40.	Ring test is not the determination for ______________(a) Breaking Force(b) Tensile strength(c) Ultimate Elongation(d) Compressive strengthI have been asked this question in an internship interview.I'm obligated to ask this question of Ring Tension Test topic in chapter Testing of Concrete of Concrete Technology
Answer» The CORRECT answer is (d) Compressive STRENGTH The best I can explain: RING test is used to ANALYSIS for Breaking Force, Tensile strength, Ultimate ELONGATION.

Discussion

41.	The flexural strength (or modulus of rupture) is obtained for the first peak load, Pmax as _______________(a) Pmax * L/bd^2(b) Pmax/Ld^2(c) Pmax * L/bd(d) Pmax/L/bd^2I have been asked this question in unit test.The origin of the question is Flexural Strength of Concrete topic in section Testing of Concrete of Concrete Technology
Answer» Right choice is (a) Pmax * L/bd^2 The explanation is: It should be noted that the value obtained may be significantly DIFFERENT from that obtained in a CONVENTIONAL test CARRIED out under load control, where the SPECIMEN fails at the PEAK load.

Discussion

42.	During compression test of cast iron, the failure occurs i.e. the crack appears along the _____________(a) Diagonal(b) Surface parallel to load applied(c) Surface perpendicular to load applied(d) LateralThe question was asked in final exam.This key question is from Compression Test topic in section Testing of Concrete of Concrete Technology
Answer» The correct option is (a) DIAGONAL The explanation is: During compression TEST of cast IRON, the failure OCCURS i.e. the CRACK appears along the diagonal.

Discussion

43.	The ability of the material to resist stress without failure is called ________________(a) Strength(b) Hardness(c) Stiffness(d) ToughnessI got this question in a national level competition.I would like to ask this question from Compression Test in section Testing of Concrete of Concrete Technology
Answer» The CORRECT OPTION is (a) Strength Best EXPLANATION: The ability of the material to resist stress WITHOUT failure is CALLED as strength.

Discussion

44.	What is flexural strength?(a) The stress value obtained when the peak load value is used in the equation of modulus of rupture(b) The stress value representing the average flexural strength in the post peak region up to a specified deflection of L/n obtained when Pe,n is used in the equation of modulus of rupture(c) The load value representing the average load-carrying capacity in the post peak region up to a specified deflection of L/n(d) Value of the mean equivalent flexural strength normalized with respect to mean flexural strengthThe question was posed to me in an online quiz.Question is taken from Flexural Strength of Concrete topic in chapter Testing of Concrete of Concrete Technology
Answer» Right ANSWER is (a) The stress VALUE obtained when the peak LOAD value is used in the equation of modulus of rupture For explanation: The stress value obtained when the peak load value is used in the equation of modulus of rupture is CALLED flexural strength.

Discussion

45.	The tensile properties of a low-pressure plasma-deposited nickel-base superalloy from ____________(a) 25 to 100° C(b) 250 to 1010° C(c) 25 to 1010° C(d) 100 to 250° CThe question was posed to me in an interview for job.This interesting question is from Ring Tension Test in portion Testing of Concrete of Concrete Technology
Answer» Right OPTION is (c) 25 to 1010° C Easy explanation: A ring tensile TEST USING a split disc fixture was developed and used to evaluate the tensile PROPERTIES of a low-pressure plasma-deposited nickel-base superalloy from 25 to 1010° C.

Discussion

46.	The property of a material that resists penetration or indentation by means of abrasion or scratching is known as ___________(a) Strength(b) Hardness(c) Stiffness(d) ToughnessI had been asked this question in an interview for internship.Question is taken from Compression Test in division Testing of Concrete of Concrete Technology
Answer» Correct ANSWER is (b) HARDNESS Easy explanation: The PROPERTY of a material that resists penetration or indentation by MEANS of abrasion or scratching is KNOWN as hardness.

Discussion

47.	Begin the test by separating the grips at a speed of_______________(a) 20 mm per minute(b) 20 inches per sec(c) 20 inches per minute(d) 20 cm per minuteThe question was asked during a job interview.My question is taken from Ring Tension Test in portion Testing of Concrete of Concrete Technology
Answer» Right option is (c) 20 INCHES per MINUTE To ELABORATE: Begin the test by separating the grips at a speed of 20 inches per minute.

Discussion

48.	In universal testing machine, for a circular section specimen, the gauge length is taken to be ______________(a) 3.65 √A(b) 4.65 √A(c) 5.65 √A(d) 6.65 √A where A is the area of cross section of the specimenI have been asked this question in a national level competition.Question is from Compression Test in portion Testing of Concrete of Concrete Technology
Answer» Right option is (C) 5.65 √A The explanation is: It is the formula to FIND the GAUGE length when we have the AREA of the SPECIMEN.

Discussion

49.	Identify the type of destructive testing ______________(a) Radiographic test(b) Dye penetrant test(c) Creep test(d) Visual testingI got this question in an online quiz.Enquiry is from Destructive and Non-Destructive Tests in chapter Testing of Concrete of Concrete Technology
Answer» The correct choice is (c) Creep test The best I can explain: Creep test is a type of destructive test. It is DEFINED as slow plastic deformation at high temperatures for a longer time under constant stresses. Creep OCCURS at room TEMPERATURE and at high temperatures.

Discussion

50.	A data acquisition system capable of digitally recording and storing load and deflection data at least ___________(a) 1 times per sec(b) 5 times per sec(c) 10 times per sec(d) 15 times per secThis question was posed to me during an online interview.I'm obligated to ask this question of Flexural Strength of Concrete topic in portion Testing of Concrete of Concrete Technology
Answer» The correct CHOICE is (c) 10 TIMES per sec The EXPLANATION: A data acquisition system CAPABLE of digitally recording and storing load and deflection data at least 10 times per second (i.e., a sampling frequency of 10 Hz is suitable.

Discussion

Explore topic-wise InterviewSolutions in .

A second name for compression wave is __________(a) Longitudinal wave(b) Shear wave(c) Surface wave(d) Lamb waveI have been asked this question in a national level competition.This key question is from Pulse Velocity Test in portion Testing of Concrete of Concrete Technology

The number of cylces per second is the definition of ____________(a) Wave speed(b) Frequency(c) Hertz(d) VelocityThe question was asked in class test.The doubt is from Pulse Velocity Test in division Testing of Concrete of Concrete Technology

For hardness test of copper in Brinell hardness tester, the diameter of ball is ___________(a) 7mm(b) 1mm(c) 5mm(d) 3mmThis question was posed to me during an internship interview.The question is from Compression Test topic in portion Testing of Concrete of Concrete Technology

Tensile test can be performed on _____________(a) Impact testing machine(b) Universal testing machine(c) Rockwell tester(d) Brinell testerThe question was asked during a job interview.My query is from Compression Test topic in division Testing of Concrete of Concrete Technology

The slump would not exceed 50 mm when compacting concrete with vibrators.(a) True(b) FalseI have been asked this question in an interview for job.The above asked question is from Curing of Hardened Concrete topic in portion Testing of Concrete of Concrete Technology

Ring test is the determination for ___________(a) Compressive strength(b) Tensile strength(c) Both Compressive and tensile strength(d) Flexural strengthThe question was asked in class test.Query is from Ring Tension Test topic in division Testing of Concrete of Concrete Technology

Calipers, capable of reading the dimensions of test specimens to an accuracy of ____________(a) 1mm(b) .1mm(c) 10mm(d) .5mmI have been asked this question in an interview.My doubt is from Flexural Strength of Concrete topic in division Testing of Concrete of Concrete Technology

The final operation of finishing the concrete surface is called _____________(a) Screeding(b) Floating(c) Troweling(d) CompactingThe question was asked in an internship interview.My question comes from Curing of Hardened Concrete in section Testing of Concrete of Concrete Technology

The indenter used in Brinell hardness test is a ____________(a) Ball(b) Cone(c) Cylinder(d) PyramidThe question was asked during an online exam.I would like to ask this question from Compression Test in chapter Testing of Concrete of Concrete Technology

Which machine records the change in length of specimen?(a) Impact testing machine(b) Universal testing machine(c) Rockwell tester(d) Brinell testerThe question was posed to me during an interview.Enquiry is from Compression Test in chapter Testing of Concrete of Concrete Technology

At least 30 __________ of crosshead travel or more for high elongation materials.(a) cm(b) inches(c) mm(d) mI got this question in an interview for internship.My doubt is from Ring Tension Test in portion Testing of Concrete of Concrete Technology

After the curing of 28 days, the concrete gains strength upto _____________(a) 40%(b) 60%(c) 80%(d) 100%I have been asked this question during an online exam.The doubt is from Curing of Hardened Concrete topic in section Testing of Concrete of Concrete Technology

Most small and common ___________ load capacity machines will work for the loads of the materials tested to this specification.(a) 1N(b) 1KN(c) 10N(d) 10KNI got this question in an interview for job.My enquiry is from Ring Tension Test in section Testing of Concrete of Concrete Technology

Rule (ruler/scale), capable of reading the dimensions of test specimens to an accuracy of ________(a) 1mm(b) .1mm(c) 10mm(d) .5mmThe question was asked at a job interview.Question is from Flexural Strength of Concrete in section Testing of Concrete of Concrete Technology

The tolerances on the cross-section of the test specimens shall be within ± ___________(a) 1%(b) 2%(c) 3%(d) 5%I have been asked this question in an interview for job.Enquiry is from Ring Tension Test topic in division Testing of Concrete of Concrete Technology

ASTM D1414 (D 1414) covers multiple properties of _____________(a) T ring(b) O ring(c) C ring(d) U ringThe question was posed to me in a job interview.My question is from Ring Tension Test in chapter Testing of Concrete of Concrete Technology

The ability of the material to resist stress without failure is called ________________(a) Strength(b) Hardness(c) Stiffness(d) ToughnessI got this question in a national level competition.I would like to ask this question from Compression Test in section Testing of Concrete of Concrete Technology

Begin the test by separating the grips at a speed of_______________(a) 20 mm per minute(b) 20 inches per sec(c) 20 inches per minute(d) 20 cm per minuteThe question was asked during a job interview.My question is taken from Ring Tension Test in portion Testing of Concrete of Concrete Technology

Identify the type of destructive testing ______________(a) Radiographic test(b) Dye penetrant test(c) Creep test(d) Visual testingI got this question in an online quiz.Enquiry is from Destructive and Non-Destructive Tests in chapter Testing of Concrete of Concrete Technology