24 + Interview Questions in Physical Test & Heat Treatment Terms in Aerospace Materials & Processes Page 1 InterviewSolution

1.	The ability of a material to resist permanent distortion or penetration is called as _______(a) hardness(b) yield point(c) malleability(d) elongationThis question was posed to me in quiz.Asked question is from Physical Terms and Test Terms topic in division Physical Test & Heat Treatment Terms of Aerospace Materials & Processes
Answer» Right answer is (a) hardness Easy EXPLANATION: The ability of a material to resist permanent distortion or PENETRATION is called hardness. ELONGATION is the increase in the length of a material. Malleability ALLOWS materials to bend without rupture.

Discussion

2.	In the process of hardening of steel, the metal has to be heated to a temperature ______ the critical range.(a) below(b) half(c) above(d) aroundI got this question in examination.The doubt is from Heat Treatment Terms topic in chapter Physical Test & Heat Treatment Terms of Aerospace Materials & Processes
Answer» Correct choice is (c) above The explanation: In the process of HARDENING of steel, the metal has to be heated to a TEMPERATURE above the critical RANGE. Hardening increases the strength of the material. In ORDER to alter the internal atomic structure of the steel to change its properties, heating it above the critical range is required.

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3.	What is the temperature at which steel fuses?(a) 1100°F(b) 200K(c) 2500°F(d) 3500°FI got this question during an interview.Asked question is from Physical Terms and Test Terms in section Physical Test & Heat Treatment Terms of Aerospace Materials & Processes
Answer» The correct option is (c) 2500°F The best I can EXPLAIN: Steel fuses at AROUND 2500°F. Aluminium ALLOYS fuse at around 1100°F. FUSIBILITY is the LIQUEFACTION of a material due to heat.

Discussion

4.	The property of being liquefied due to heat is known as ______(a) stress(b) contraction(c) normalizing(d) fusibilityI had been asked this question during an interview for a job.My question comes from Physical Terms and Test Terms topic in division Physical Test & Heat Treatment Terms of Aerospace Materials & Processes
Answer» The correct answer is (d) FUSIBILITY Easy explanation: The property of being LIQUEFIED due to HEAT is known as fusibility. CONTRACTION is the reduction in length of MATERIAL and stress is the load on the material.

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5.	The tendency of a material to fracture without changing it’s shape is known as ______(a) brittleness(b) hardness(c) elasticity(d) carburizingThis question was addressed to me in semester exam.Query is from Physical Terms and Test Terms topic in chapter Physical Test & Heat Treatment Terms of Aerospace Materials & Processes
Answer» CORRECT answer is (a) brittleness To explain I would say: The tendency of a material to fracture without changing it’s shape is known as brittleness. Hardness of a material is its tendency to resist penetration. Elasticity of a material is the PROPERTY of the material to return to its ORIGINAL shape once the force causing the distortion of shape is removed.

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6.	The critical range of steel is between ______(a) 1300°F and 1600°F(b) 2400°F and 2600°F(c) 900°F and 2800°F(d) 900°F and 2400°FI got this question in quiz.This intriguing question comes from Heat Treatment Terms topic in chapter Physical Test & Heat Treatment Terms of Aerospace Materials & Processes
Answer» Right ANSWER is (a) 1300°F and 1600°F The explanation is: The critical RANGE of steel is between 1300°F and 1600°F. Critical range of a material refers to the range between which internal change OCCURS in a metal. It is important in a LOT of heat treatment methods.

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7.	The load obtained in a tension test is 500N and the original cross sectional area is 250m^2 what is the tensile strength of the material?(a) 5 m(b) 25 N/m^2(c) 2 N/m^2(d) 20 mI have been asked this question in a job interview.This interesting question is from Physical Terms and Test Terms topic in section Physical Test & Heat Treatment Terms of Aerospace Materials & Processes
Answer» The correct option is (C) 2 N/m^2 Easy explanation: Tensile STRENGTH = \(\FRAC{Maximum \,load \,obtained}{ORIGINAL \,cross-sectional \,area}\) = \(\frac{500}{250}\) = 2 N/m^2.

Discussion

8.	The modulus of elasticity of a material can be described as ________(a) the product of stress and strain(b) the ratio of stress to strain(c) the product of yield point and strain(d) the ratio of change in length to original lengthI have been asked this question in my homework.Asked question is from Physical Terms and Test Terms in portion Physical Test & Heat Treatment Terms of Aerospace Materials & Processes
Answer» RIGHT choice is (b) the ratio of stress to strain Easiest explanation: The ratio of stress to strain is CALLED the modulus of elasticity (within the elastic limit). The ratio of CHANGE in length to ORIGINAL length is called strain.

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9.	Which heat treatment method is also called as “drawing”?(a) Tempering(b) Casehardening(c) Annealing(d) NormalizingThis question was posed to me in homework.I want to ask this question from Heat Treatment Terms topic in portion Physical Test & Heat Treatment Terms of Aerospace Materials & Processes
Answer» Correct answer is (a) Tempering Easy EXPLANATION: Tempering is also called drawing. Tempering, UNLIKE other heat treatment methods, requires the metal to be REHEATED under the critical range. It is then cooled depending on the MATERIAL and the requirement of its physical properties.

Discussion

10.	Carburizing is ideally carried out on steels that have less than __________ carbon content.(a) 90%(b) 50%(c) 10%(d) 25%I got this question by my college director while I was bunking the class.My enquiry is from Heat Treatment Terms topic in chapter Physical Test & Heat Treatment Terms of Aerospace Materials & Processes
Answer» The correct answer is (d) 25% The explanation is: Carburizing is a PROCESS in which carbon is ADDED to steel, by heating it in contact with a carbon-bearing material at a high temperature. Carburizing Is ideally CARRIED out on steels that have less than 25% carbon content.

Discussion

11.	In the process of the hardening of aluminum alloys, what is the temperature above which it should be heated?(a) 1200°F(b) 600°F(c) 2400°F(d) 900°FI had been asked this question by my school principal while I was bunking the class.This intriguing question originated from Heat Treatment Terms topic in portion Physical Test & Heat Treatment Terms of Aerospace Materials & Processes
Answer» CORRECT option is (d) 900°F The best I can EXPLAIN: When a material is heated beyond its critical range, and subsequently UNDERGOES the process of quenching it is called HARDENING. Aluminum alloys are heated above TEMPERATURES of 900°F to be hardened.

Discussion

12.	Normalizing is a heat treatment carried out on all metals.(a) True(b) FalseI have been asked this question in an interview for internship.I'd like to ask this question from Heat Treatment Terms in division Physical Test & Heat Treatment Terms of Aerospace Materials & Processes
Answer» Right option is (B) False Explanation: NORMALIZING is a heat treatment method of steel. It closely resembles annealing. But, COMPARED to annealing it is faster and MAKES the material stronger. Also, annealing is done for several MATERIALS.

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13.	A material elongated to 35m due to certain conditions. If it’s initial length is 7m, what is the strain of the material?(a) 21m(b) 5m(c) 7m(d) 35mThis question was posed to me in an interview for internship.The doubt is from Physical Terms and Test Terms in section Physical Test & Heat Treatment Terms of Aerospace Materials & Processes
Answer» CORRECT option is (b) 5m The EXPLANATION is: Strain = \(\FRAC{CHANGE \,in \,length}{Original \,length} = \frac{35}{7}\) = 5m.

Discussion

14.	The property of a material involving transmitting of heat or electricity is known as _________(a) expansion(b) stress(c) contraction(d) conductionThe question was posed to me during an online interview.Asked question is from Physical Terms and Test Terms in section Physical Test & Heat Treatment Terms of Aerospace Materials & Processes
Answer» The correct answer is (d) conduction The explanation: The property of a material involving transmitting of heat or electricity is known as conduction. It is ALSO a property to be considered in AIRCRAFT ELECTRICAL BONDING.

Discussion

15.	Quenching involves submerging a heated metal in a liquid to speed up its cooling process.(a) True(b) FalseI had been asked this question during an online exam.The above asked question is from Heat Treatment Terms topic in portion Physical Test & Heat Treatment Terms of Aerospace Materials & Processes
Answer» Right option is (a) True Explanation: Quenching is the PROCESS of cooling a metal by submerging it in a liquid. It is a HEAT treatment process. The liquids used in this method are typically WATER or oil. It INCREASES the strength of a material.

Discussion

16.	Annealing a metal ________ its internal strains.(a) doesn’t affect(b) removes(c) increases(d) doublesI got this question by my college professor while I was bunking the class.My enquiry is from Heat Treatment Terms topic in portion Physical Test & Heat Treatment Terms of Aerospace Materials & Processes
Answer» RIGHT choice is (b) removes Explanation: Annealing a metal is heating it uniformly and then cooling it SLOWLY. This alters the internal arrangement of ATOMS. Annealing is known to remove internal strains and decrease the HARDNESS of the metal.

Discussion

17.	Steel is one of the few materials that has a definite yield point.(a) True(b) FalseThe question was asked during an interview.Asked question is from Physical Terms and Test Terms topic in portion Physical Test & Heat Treatment Terms of Aerospace Materials & Processes
Answer» Right option is (a) True Explanation: The yield POINT is a point after which there is an increase in DEFORMATION WITHOUT a load increase. STEEL is one the few materials that has a definite yield point.

Discussion

18.	Casehardening refers to _________ the material, after which necessary heat treatment is done to it.(a) annealing(b) critical range(c) carburizing(d) hardeningThis question was addressed to me in homework.The question is from Heat Treatment Terms topic in chapter Physical Test & Heat Treatment Terms of Aerospace Materials & Processes
Answer» The correct option is (c) carburizing To explain: In casehardening, the material has to first undergo carburizing. Then, the material is subjected to heat treatment. This is DONE to harden the surface of the material. Critical RANGE is a range of temperatures at which the STRUCTURE of a METAL changes.

Discussion

19.	Hardness is inversely proportional to strength.(a) True(b) FalseI got this question in a job interview.My query is from Physical Terms and Test Terms topic in section Physical Test & Heat Treatment Terms of Aerospace Materials & Processes
Answer» Correct choice is (B) False To elaborate: HARDNESS is directly proportional to strength. As the hardness of a material increases, it’s strength increases. Hardness is the tendency of a material to RESIST penetration. Strength of a material is its capacity to WITHSTAND a load.

Discussion

20.	Why do metals contract and expand?(a) Due to cooling and heating(b) Due to displacement(c) Due to repairs(d) Due to false recognitionI have been asked this question in an interview.The question is from Physical Terms and Test Terms in section Physical Test & Heat Treatment Terms of Aerospace Materials & Processes
Answer» Right ANSWER is (a) Due to cooling and HEATING Best explanation: The cooling and heating of metals causes CONTRACTION and expansion respectively. That is the reason why railway tracks EXPAND in SUMMER.

Discussion

21.	Which of the following property of a material is preferred in the construction of an aircraft?(a) Ductility(b) Elasticity(c) Hardness(d) High densityThis question was addressed to me by my college director while I was bunking the class.My enquiry is from Physical Terms and Test Terms topic in portion Physical Test & Heat Treatment Terms of Aerospace Materials & Processes
Answer» CORRECT option is (d) High DENSITY Explanation: Ductility, elasticity and HARDNESS are all PREFERRED in the construction of an aircraft. High density is not preferred. INSTEAD, low density is preferred.

Discussion

22.	What is the effect of heat treatment on a metal?(a) Improvement in availability(b) Improved physical properties(c) Decreased color(d) Decreased availabilityI have been asked this question in a job interview.This interesting question is from Heat Treatment Terms topic in chapter Physical Test & Heat Treatment Terms of Aerospace Materials & Processes
Answer» Right option is (B) IMPROVED PHYSICAL properties The explanation: Heat treatment improves/changes the physical properties of a given METAL. It is a set of processes involving several different methods like hardening, drawing, etc. Heat treatment does not affect the AVAILABILITY of the metal.

Discussion

23.	If a material is loaded beyond its elastic limit _________(a) it returns back to it’s original shape(b) it acquires softness(c) it is permanently distorted(d) it turns to liquidI have been asked this question during an interview.Enquiry is from Physical Terms and Test Terms topic in portion Physical Test & Heat Treatment Terms of Aerospace Materials & Processes
Answer» Right answer is (c) it is PERMANENTLY distorted The EXPLANATION is: If a material is loaded beyond its ELASTIC limit, it is permanently distorted. Elastic limit is the extent up to which a material can withstand stress WITHOUT deforming permanently.

Discussion

24.	What is the total permissible elongation for a gage length of 5.08cm?(a) 5080 cm(b) 0.00508 cm(c) 0.508 cm(d) 0.000508 cmThe question was posed to me in an interview for internship.My enquiry is from Physical Terms and Test Terms topic in chapter Physical Test & Heat Treatment Terms of Aerospace Materials & Processes
Answer» The CORRECT OPTION is (d) 0.000508 cm Easiest explanation: The PROOF stress is the load a material can endure without permanent distortion of more than 0.0001cm per 1cm. So, if the gage length is 5.08cm, the total permissible ELONGATION would be – 5.08×0.0001 = 0.000508cm.

Discussion

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What is the temperature at which steel fuses?(a) 1100°F(b) 200K(c) 2500°F(d) 3500°FI got this question during an interview.Asked question is from Physical Terms and Test Terms in section Physical Test & Heat Treatment Terms of Aerospace Materials & Processes

Normalizing is a heat treatment carried out on all metals.(a) True(b) FalseI have been asked this question in an interview for internship.I'd like to ask this question from Heat Treatment Terms in division Physical Test & Heat Treatment Terms of Aerospace Materials & Processes

Steel is one of the few materials that has a definite yield point.(a) True(b) FalseThe question was asked during an interview.Asked question is from Physical Terms and Test Terms topic in portion Physical Test & Heat Treatment Terms of Aerospace Materials & Processes

Hardness is inversely proportional to strength.(a) True(b) FalseI got this question in a job interview.My query is from Physical Terms and Test Terms topic in section Physical Test & Heat Treatment Terms of Aerospace Materials & Processes