60 + Interview Questions in Electrical Engineering Materials in Design Of Electrical Machines Page 1 InterviewSolution

1.	Which among the following is the example of Class B?(a) Inorganic material with adhesives(b) Hard fiber(c) Wood(d) Impregnated oilThis question was addressed to me during an interview.I'm obligated to ask this question of Temperature Rise and Insulating Materials topic in chapter Electrical Engineering Materials of Design of Electrical Machines
Answer» CORRECT answer is (a) INORGANIC material with adhesives For explanation I would say: Impregnated OIL is the example of CLASS H. Hard FIBER is the example of Class Y and Wood is the example of Class A.

Discussion

2.	Which among the following is the example of Class Y?(a) Varnish(b) Insulation oil(c) Paper(d) ResinsThe question was posed to me by my college director while I was bunking the class.This key question is from Temperature Rise and Insulating Materials in chapter Electrical Engineering Materials of Design of Electrical Machines
Answer» Correct option is (c) Paper To elaborate: VARNISH is an example of Class A. Even INSULATION OIL is an example of Class A. RESINS is an example of Class E.

Discussion

3.	Which among the following is an example of Class F?(a) Paper lamination(b) Nitrile rubber(c) Asbestos(d) SiliconeI had been asked this question during an interview.Asked question is from Temperature Rise and Insulating Materials in section Electrical Engineering Materials of Design of Electrical Machines
Answer» Correct OPTION is (d) Silicone The explanation: Paper lamination is the example of CLASS E. Nitrile Rubber is the example of Class A. Asbestos is the example of Class B.

Discussion

4.	Silicone rubber is an example of Class H.(a) True(b) FalseThis question was addressed to me in an international level competition.My question is taken from Temperature Rise and Insulating Materials in section Electrical Engineering Materials of Design of Electrical Machines
Answer» The CORRECT option is (a) True Easiest EXPLANATION: CLASS H is one of the insulation classes having temperature about 180°C. SILICONE RUBBER is one of the examples of Class H.

Discussion

5.	How many classes have their temperatures above 150°C?(a) 2(b) 3(c) 4(d) 5I got this question during an interview.I'm obligated to ask this question of Temperature Rise and Insulating Materials topic in portion Electrical Engineering Materials of Design of Electrical Machines
Answer» The correct choice is (b) 3 Easiest explanation: Of 7 classes of insulation, there are 3 classes WHOSE temperatures are above 150°C. They are classes F, H, C of insulation.

Discussion

6.	Which class has the lowest and the highest temperature?(a) Class Y, Class C(b) Class Y, Class H(c) Class H, Class C(d) Class B, Class HThe question was asked in my homework.My question is based upon Temperature Rise and Insulating Materials topic in portion Electrical Engineering Materials of Design of Electrical Machines
Answer» Correct option is (a) CLASS Y, Class C Explanation: Class Y BELONGS to the LOWEST insulation class of having temperature of about 90°C. CLASSC is the highest insulation class of having temperature above 180°C.

Discussion

7.	What is the temperature of Class B?(a) 120°C(b) 130°C(c) 155°C(d) 180°CThis question was posed to me in an internship interview.This interesting question is from Temperature Rise and Insulating Materials in portion Electrical Engineering Materials of Design of Electrical Machines
Answer» The correct ANSWER is (b) 130°C For EXPLANATION: 120°C refers to the TEMPERATURE of CLASS E. 155°C refers to the temperature of Class F. 180°C refers to the temperature of Class H.

Discussion

8.	Class A has higher temperature than Class E.(a) True(b) FalseI have been asked this question by my college professor while I was bunking the class.The doubt is from Temperature Rise and Insulating Materials topic in section Electrical Engineering Materials of Design of Electrical Machines
Answer» The CORRECT option is (b) False The EXPLANATION is: CLASS E has a higher TEMPERATURE than that of Class A. The temperature of Class A is 105°C and the temperature of Class E is 120°C.

Discussion

9.	How many classes have their temperatures above 100°C?(a) 5(b) 6(c) 7(d) 8I have been asked this question in semester exam.This intriguing question comes from Temperature Rise and Insulating Materials in portion Electrical Engineering Materials of Design of Electrical Machines
Answer» The correct answer is (b) 6 The EXPLANATION is: There are 7 insulation classes PRESENT in relation with TEMPERATURE. Of the 7 classes, there are 6 classes WHOSE temperatures are greater than 100°C. Class Y is the only class having temperature less than 100.

Discussion

10.	How many types of electrical insulators are present on the basis of voltage application?(a) 2(b) 3(c) 4(d) 5I got this question in an interview for job.My question is from Insulating Materials topic in section Electrical Engineering Materials of Design of Electrical Machines
Answer» Correct option is (a) 2 For explanation I would SAY: There are TWO TYPES of insulators based on VOLTAGE application. They are Stay Insulators and SHACKLE Insulators.

Discussion

11.	How many number of insulation classes are present with respect to electrical equipment?(a) 5(b) 6(c) 7(d) 8The question was posed to me by my college professor while I was bunking the class.The above asked question is from Temperature Rise and Insulating Materials in portion Electrical Engineering Materials of Design of Electrical Machines
Answer» The correct choice is (c) 7 The best I can explain: There are 7 classes of insulation with respect to electrical EQUIPMENT. They are Class Y, Class A, Class E, Class B, Class F, Class H, Class C.

Discussion

12.	How many discs are used in suspension insulators for 220kV?(a) 3(b) 4(c) 8(d) 14The question was posed to me by my college professor while I was bunking the class.My question is from Insulating Materials topic in chapter Electrical Engineering Materials of Design of Electrical Machines
Answer» The correct CHOICE is (d) 14 Easy EXPLANATION: 3 discs are USED when VOLTAGE is 33kV. 4 discs are used when voltage is 66kV. 8 discs are used when voltage application is 132kV.

Discussion

13.	What is the other name of the shackle insulator?(a) String(b) Hanging(c) Spool(d) PostI got this question in an interview.Asked question is from Insulating Materials topic in chapter Electrical Engineering Materials of Design of Electrical Machines
Answer» Right choice is (c) Spool Easy explanation: String is the other NAME of strain INSULATORS, whereas, hanging is the other name of suspension insulators. POST INSULATOR is otherwise Pin insulators.

Discussion

14.	What is the other name of Polymer Insulator?(a) Moisture insulator(b) Core insulator(c) Composite insulator(d) Mixed insulatorThis question was addressed to me by my school teacher while I was bunking the class.My question is based upon Insulating Materials topic in portion Electrical Engineering Materials of Design of Electrical Machines
Answer» The correct option is (c) Composite insulator The BEST I can EXPLAIN: It is also known as composite insulator. It is known as composite insulator because it consists of both CORE and the weather sheds in them.

Discussion

15.	How many classifications of overhead line insulators are there?(a) 3(b) 4(c) 5(d) 6I got this question during a job interview.This is a very interesting question from Insulating Materials topic in chapter Electrical Engineering Materials of Design of Electrical Machines
Answer» The correct choice is (a) 3 The explanation: There are BASICALLY 3 types of OVERHEAD LINE insulators. They are Pin type, SUSPENSION type and Stray Insulator type.

Discussion

16.	Glass has lower tensile strength compared to porcelain insulators.(a) True(b) FalseThe question was asked at a job interview.My query is from Insulating Materials in division Electrical Engineering Materials of Design of Electrical Machines
Answer» Right OPTION is (B) False Easy explanation: Glass insulators have all PROPERTIES better than that of PORCELAIN. Glass has high dielectric strength, low coefficient of THERMAL expansion and then High tensile strength than that of porcelain.

Discussion

17.	What is the dielectric strength, coefficient of thermal expansion of glass with respect to porcelain insulators?(a) High, high(b) High, low(c) Low, low(d) Low, highThis question was addressed to me in examination.The query is from Insulating Materials topic in chapter Electrical Engineering Materials of Design of Electrical Machines
Answer» The CORRECT answer is (b) High, low Explanation: GLASS has a higher DIELECTRIC STRENGTH (140 kV/cm) when compared to porcelain (60 kV/cm) and glass has a lower COEFFICIENT of thermal expansion when compared to porcelain.

Discussion

18.	What is the dielectric strength of porcelain insulators?(a) 60 kV/cm(b) 140 kV/cm(c) 50 kV/cm(d) 40 kV/cmThis question was posed to me in an interview for job.Question is from Insulating Materials topic in portion Electrical Engineering Materials of Design of Electrical Machines
Answer» The CORRECT OPTION is (a) 60 kV/cm Easy EXPLANATION: Porcelain has a dielectric strength of 60kV/cm. 140 kV/cm denotes the dielectric strength of glass insulator.

Discussion

19.	What is property of porosity and temperature change in insulating materials?(a) Less, less affected(b) Less, highly affected(c) High, highly affected(d) High, less affectedI got this question in an interview for job.I'd like to ask this question from Insulating Materials topic in chapter Electrical Engineering Materials of Design of Electrical Machines
Answer» The correct option is (a) Less, less affected For explanation I would say: The insulating materials should have less POROSITY as it should not lose the internal properties due to HOLES. The MATERIAL should also be less affected by TEMPERATURE change in ORDER to preserve its properties.

Discussion

20.	How should the properties of strength and dielectric strength in insulating materials?(a) High strength, low Dielectric strength(b) Low strength, low Dielectric strength(c) High strength, high Dielectric strength(d) Low strength, high Dielectric strengthThe question was asked in examination.This interesting question is from Insulating Materials topic in division Electrical Engineering Materials of Design of Electrical Machines
Answer» Correct choice is (c) HIGH strength, high Dielectric strength Best explanation: The insulator should have high strength in order to prevent the INSULATING materials. The insulator should have high dielectric strength, in order to hold the ELECTRIC field without breaking down.

Discussion

21.	Insulation Resistance should be high in insulators.(a) True(b) FalseThis question was posed to me in an interview for job.The doubt is from Insulating Materials in section Electrical Engineering Materials of Design of Electrical Machines
Answer» Right choice is (a) True The best I can EXPLAIN: Insulation Resistance is very IMPORTANT in the performance of insulating materials. If the insulation resistance becomes LOW, high flow of CURRENT occurs and can damage the material.

Discussion

22.	What happens when some serious phenomenon occurs in the insulators?(a) Puncher is produced in the insulator body(b) Insulator body bulges(c) Insulator body bursts(d) Insulator body tears apartI had been asked this question by my school teacher while I was bunking the class.My doubt is from Insulating Materials topic in section Electrical Engineering Materials of Design of Electrical Machines
Answer» Correct answer is (a) Puncher is produced in the insulator BODY Easiest explanation: The serious phenomenon is the abnormal over voltage, produced in the insulators. Due to that, FLASHOVER OCCURS in the insulators. This causes puncher of the insulator body.

Discussion

23.	What is the main cause for the failure of overhead line insulators?(a) Surges(b) Flashover(c) Arching(d) GroundingThe question was asked in class test.Enquiry is from Insulating Materials topic in chapter Electrical Engineering Materials of Design of Electrical Machines
Answer» Correct choice is (B) Flashover To explain I would say: In OVERHEAD lines, there OCCURS a flow of ABNORMAL over voltages. This abnormal over voltages, causes flashover. This flashover causes damage to overhead line insulators.

Discussion

24.	What is the property of insulating materials?(a) Prevents the unwanted flow of current(b) Allows the unwanted flow of current(c) Increases the unwanted flow of current(d) Decreases the unwanted flow of currentI have been asked this question during an online exam.I want to ask this question from Insulating Materials in chapter Electrical Engineering Materials of Design of Electrical Machines
Answer» The correct choice is (a) PREVENTS the unwanted flow of CURRENT The BEST I can explain: Conductors, allow the flow of current through the material. Insulators are the opposite of conductors. The material doesn’t allow the flow of current through them.

Discussion

25.	In the Transmission and Distribution sector, where should the insulators be placed?(a) Between towers and poles(b) Between towers and ground(c) Between towers and conductors(d) Between conductors and groundThis question was addressed to me during an online interview.Asked question is from Insulating Materials in portion Electrical Engineering Materials of Design of Electrical Machines
Answer»

Discussion

26.	What is the example of diamagnetic materials?(a) Quartz(b) Pyrite(c) Montmorillonite(d) BiotiteThe question was posed to me in an interview for job.This intriguing question originated from Magnetic Materials topic in section Electrical Engineering Materials of Design of Electrical Machines
Answer» Correct option is (a) QUARTZ Explanation: The other 3 materials are PARAMAGNETIC in nature, which MEANS magnetization is slightly above 1. Quartz is a DIAMAGNETIC material in which the magnetization is negative.

Discussion

27.	What is the example of ferromagnetic materials is?(a) Magnetite(b) Hematite(c) Nickel(d) BiotiteThis question was posed to me in semester exam.My query is from Magnetic Materials topic in section Electrical Engineering Materials of Design of Electrical Machines
Answer» The correct choice is (a) Magnetite Easy EXPLANATION: Hematite denotes the example of antiferromagnetic MATERIALS. NICKEL denotes an example of FERROMAGNETIC materials. Biotite denotes the example of paramagnetic materials.

Discussion

28.	What is the property of ferromagnetic materials?(a) Negative magnetization(b) Magnetization slightly less than 1(c) Magnetization slightly greater than 1(d) Magnetization very much higher than 1The question was posed to me during an interview for a job.Query is from Magnetic Materials topic in portion Electrical Engineering Materials of Design of Electrical Machines
Answer» Right choice is (d) Magnetization very MUCH HIGHER than 1 To explain: Negative magnetization denotes the property of Diamagnetic materials. Magnetization slightly GREATER than 1 denotes the property of Paramagnetic materials. Ferromagnetic materials have magnetization in the range of 1000+.

Discussion

29.	How many classifications of magnetic materials are present?(a) 3(b) 4(c) 5(d) 6I have been asked this question in final exam.I'd like to ask this question from Magnetic Materials in section Electrical Engineering Materials of Design of Electrical Machines
Answer» CORRECT choice is (c) 5 The best I can explain: There are basically 4 PROPERTIES in magnetic materials and 5 CLASSIFICATIONS. They are diamagnetic, paramagnetic, ferromagnetic, antiferromagnetic, FERRIMAGNETIC.

Discussion

30.	High Reluctance affects the performance of magnetic materials.(a) True(b) FalseThe question was asked in an internship interview.I'm obligated to ask this question of Magnetic Materials topic in section Electrical Engineering Materials of Design of Electrical Machines
Answer» Correct choice is (a) True Best explanation: High RELUCTANCE means the MATERIALS resist in building up the magnetic FLUX to a higher extent. So, for the proper functioning the reluctance values should be as LOW as possible.

Discussion

31.	What is the unit of reluctance in magnetic materials?(a) Henry/m(b) Weber/m^2(c) Ampere-turns/Weber(d) Ampere-turns/mThe question was posed to me in exam.Question is from Magnetic Materials in chapter Electrical Engineering Materials of Design of Electrical Machines
Answer»

Discussion

32.	What is reluctance in magnetic materials?(a) Allows the buildup of magnetic flux(b) Reduces the buildup of magnetic flux(c) Resists the buildup of magnetic flux(d) Increases the buildup of magnetic fluxThe question was asked by my college professor while I was bunking the class.This interesting question is from Magnetic Materials topic in division Electrical Engineering Materials of Design of Electrical Machines
Answer» RIGHT answer is (c) RESISTS the buildup of magnetic flux The explanation is: Reluctance, as the name suggests, is SOMETHING which is reluctant or HESITANT to do. As per the magnetic terms it resists the building up of magnetic flux in the materials.

Discussion

33.	What are magnetic hard materials?(a) High retentivity, low coercivity(b) High retentivity, high coercivity(c) Low retentivity, low coercivity(d) Low retentivity, high coercivityThe question was posed to me in a job interview.This is a very interesting question from Magnetic Materials in portion Electrical Engineering Materials of Design of Electrical Machines
Answer» The correct choice is (b) High RETENTIVITY, high coercivity The EXPLANATION is: High retentivity is required for protecting the magnetic MATERIALS from LOSING its magnetic PROPERTY. High coercivity is required to reduce the effect of retentivity to protect the material.

Discussion

34.	What is coercivity force in magnetic materials?(a) The force required to add upon the existing magnetization(b) The force required to remove the existing magnetization(c) The force required to produce magnetic flux(d) The force required to break magnetic fluxThis question was addressed to me in an interview for internship.This is a very interesting question from Magnetic Materials in division Electrical Engineering Materials of Design of Electrical Machines
Answer» Right answer is (b) The force REQUIRED to remove the existing magnetization To EXPLAIN I would say: MAGNETIC materials generally have the property of RETAINING magnetization, even if the EXTERNAL magnetic field is removed. So, coercive force is the force that is required to reduce the magnetization.

Discussion

35.	What is the property of retentivity in magnetic materials?(a) After removal of external magnetic fields, magnetization exists(b) After removal of external magnetic fields, magnetization doesn’t exist(c) After removal of internal magnetic fields, magnetization exists(d) After removal of internal magnetic fields, magnetization doesn’t existThis question was addressed to me in an interview for job.My question is taken from Magnetic Materials topic in portion Electrical Engineering Materials of Design of Electrical Machines
Answer»

Discussion

36.	How should the permeability and number of ampere turns for good magnetic materials be?(a) high permeability, high ampere turns(b) high permeability, low ampere turns(c) low permeability, low ampere turns(d) low permeability, high ampere turnsThe question was posed to me in an online interview.The above asked question is from Magnetic Materials in chapter Electrical Engineering Materials of Design of Electrical Machines
Answer» CORRECT option is (b) high PERMEABILITY, low ampere turns For explanation I would say: High permeability is always REQUIRED in magnetic materials for its good OPERATION. At the same time high permeability leads to LESS ampere turns in the materials.

Discussion

37.	Is retentivity associated with B-H curve?(a) Yes(b) NoThe question was asked in unit test.The question is from Magnetic Materials in division Electrical Engineering Materials of Design of Electrical Machines
Answer» The correct CHOICE is (a) Yes The best I can explain: B-H curve deals with the concepts of RETENTIVITY and coercivity. The property of retentivity can be SHOWN in the B-H curve by an INCREASING curve in the curve.

Discussion

38.	What is the representation of permeability?(a) coercivity/retentivity(b) flux/flux density(c) magnetic force/magnetic flux density(d) magnetic flux density/magnetic forceI had been asked this question during an internship interview.I would like to ask this question from Magnetic Materials topic in portion Electrical Engineering Materials of Design of Electrical Machines
Answer» Correct choice is (d) MAGNETIC flux density/magnetic FORCE The best explanation: Permeability is the property which deals, with the relationship with magnetic flux density and magnetic force. Magnetic force/Magnetic flux density deals with the reciprocal of permeability. Coercivity/Retentivity deals with the TERMS of B-H CURVE.

Discussion

39.	What is the property of permeability in magnetic materials?(a) how easily the magnetic flux is broken/clear(b) how easily the magnetic flux is set up(c) how long the magnetic flux takes to form(d) how long the magnetic flux takes to clearThis question was posed to me in a job interview.This interesting question is from Magnetic Materials in portion Electrical Engineering Materials of Design of Electrical Machines
Answer»

Discussion

40.	What is the property of magnetic materials?(a) Resistivity(b) Conductivity(c) Permeability(d) DuctilityI had been asked this question in an interview for internship.I'm obligated to ask this question of Magnetic Materials in section Electrical Engineering Materials of Design of Electrical Machines
Answer» Right option is (c) PERMEABILITY The EXPLANATION: There are many properties of magnetic materials, and permeability is one AMONG them. The other 3 properties are related to other materials LIKE CONDUCTING and insulating materials.

Discussion

41.	Which property of aluminum it the most preferred element?(a) good conductivity(b) highly malleable, highly ductile(c) most abundant element(d) good corrosion resistantI have been asked this question in unit test.My question comes from High Conductivity Materials in portion Electrical Engineering Materials of Design of Electrical Machines
Answer» Correct ANSWER is (c) most abundant element The best I can explain: All the other elements AMONG Silver, Copper, Gold have the other 3 properties ALONG with Aluminum. But all the above MENTIONED materials are not HIGHLY abundant, which is also an important factor.

Discussion

42.	Which two elements are used in precious instruments?(a) Copper, Silver(b) Gold, Silver(c) Copper, Aluminum(d) Gold, AluminumI have been asked this question in a job interview.This question is from High Conductivity Materials topic in division Electrical Engineering Materials of Design of Electrical Machines
Answer» The correct option is (b) Gold, SILVER The EXPLANATION: Silver is used only in precious instruments because of its high cost. Gold, on the other hand, is not only costly but also not SUITABLE for many practical applications and can LOSE its properties easily.

Discussion

43.	What is the specific gravity of aluminum?(a) 8.96 gm/cm^3(b) 19.30 gm/cm^3(c) 2.70 gm/cm^3(d) 10.49 gm/cm^3I had been asked this question in examination.My enquiry is from High Conductivity Materials in division Electrical Engineering Materials of Design of Electrical Machines
Answer» Right ANSWER is (c) 2.70 gm/cm^3 For EXPLANATION: 8.96 gm/cm^3 is the specific gravity of Copper. 19.30 gm/cm^3 relates to the specific gravity of GOLD and 10.49 gm/cm^3 is the specific gravity of SILVER.

Discussion

44.	What is the melting point of aluminum?(a) 660^0C(b) 1085^0C(c) 962^0C(d) 1064^0CThis question was posed to me in unit test.My question is based upon High Conductivity Materials topic in section Electrical Engineering Materials of Design of Electrical Machines
Answer» The CORRECT choice is (b) 1085^0C Easiest explanation: 660^0C is the melting point of ALUMINUM. 962^0C relates to the melting point of SILVER and1085^0C is the melting point of COPPER.

Discussion

45.	Silver is not used in practical electrical machines.(a) True(b) FalseI have been asked this question in an international level competition.The query is from High Conductivity Materials in chapter Electrical Engineering Materials of Design of Electrical Machines
Answer» The correct option is (a) True Explanation: Silver has lots of PROPERTIES which can make it suitable to be used in PRACTICAL use. But the HIGH cost factor which occurs to Silver MAKES it used only for important instruments.

Discussion

46.	What is the conductivity of Copper?(a) 0.632910^6 mho/cm(b) 0.595210^6 mho/cm(c) 0.452910^6 mho/cm(d) 0.377310^6 mho/cmThe question was asked during an interview for a job.The doubt is from High Conductivity Materials topic in division Electrical Engineering Materials of Design of Electrical Machines
Answer»

Discussion

47.	What is the temperature coefficient of silver?(a) 0.00386 per^0C(b) 0.0034 per^0C(c) 0.00429 per^0C(d) 0.0038 per^0CI got this question in my homework.The query is from High Conductivity Materials in section Electrical Engineering Materials of Design of Electrical Machines
Answer» Correct answer is (d) 0.0038 per^0C The explanation: 0.0034 per^0C relates to the TEMPERATURE coefficient of GOLD, whereas 0.00429 per^0C is the temperature coefficient of Aluminum. 0.00386 per^0C CORRESPONDS to temperature coefficient of Copper.

Discussion

48.	What are the characteristics of high conductivity materials based on cost and flexibility?(a) Low cost, low flexibility(b) Low cost, high flexibility(c) High cost, low flexibility(d) High cost, high flexibilityI got this question in an international level competition.I would like to ask this question from High Conductivity Materials topic in section Electrical Engineering Materials of Design of Electrical Machines
Answer» Correct OPTION is (b) Low cost, HIGH flexibility Explanation: Cost should be ALWAYS less, in ORDER to help in purchase of many quantities of the material for more APPLICATIONS. It should also be highly flexible, in order to mould according to people’s choice.

Discussion

49.	High conductivity materials are used in electrical machines.(a) True(b) FalseI have been asked this question by my school principal while I was bunking the class.I'd like to ask this question from High Conductivity Materials in portion Electrical Engineering Materials of Design of Electrical Machines
Answer» CORRECT OPTION is (a) True The explanation is: These materials have low RESISTIVITY. HENCE they allow for the good flow of CURRENT, which in turn allows the proper operation of the machine.

Discussion

50.	Which material has the highest conductivity of all materials?(a) Silver(b) Copper(c) Gold(d) TungstenThis question was addressed to me during an internship interview.My question is from High Conductivity Materials topic in division Electrical Engineering Materials of Design of Electrical Machines
Answer» Correct CHOICE is (a) Silver Explanation: On a scale of 100, silver has 100 PERCENT on high conductivity, copper has 97. When COMPARED to silver and copper GOLD has only 76 percent. Tungsten is not a MATERIAL of this group.

Discussion

Explore topic-wise InterviewSolutions in .

Silicone rubber is an example of Class H.(a) True(b) FalseThis question was addressed to me in an international level competition.My question is taken from Temperature Rise and Insulating Materials in section Electrical Engineering Materials of Design of Electrical Machines

How many classes have their temperatures above 150°C?(a) 2(b) 3(c) 4(d) 5I got this question during an interview.I'm obligated to ask this question of Temperature Rise and Insulating Materials topic in portion Electrical Engineering Materials of Design of Electrical Machines

What is the temperature of Class B?(a) 120°C(b) 130°C(c) 155°C(d) 180°CThis question was posed to me in an internship interview.This interesting question is from Temperature Rise and Insulating Materials in portion Electrical Engineering Materials of Design of Electrical Machines

Class A has higher temperature than Class E.(a) True(b) FalseI have been asked this question by my college professor while I was bunking the class.The doubt is from Temperature Rise and Insulating Materials topic in section Electrical Engineering Materials of Design of Electrical Machines

How many classes have their temperatures above 100°C?(a) 5(b) 6(c) 7(d) 8I have been asked this question in semester exam.This intriguing question comes from Temperature Rise and Insulating Materials in portion Electrical Engineering Materials of Design of Electrical Machines

How many types of electrical insulators are present on the basis of voltage application?(a) 2(b) 3(c) 4(d) 5I got this question in an interview for job.My question is from Insulating Materials topic in section Electrical Engineering Materials of Design of Electrical Machines

How many discs are used in suspension insulators for 220kV?(a) 3(b) 4(c) 8(d) 14The question was posed to me by my college professor while I was bunking the class.My question is from Insulating Materials topic in chapter Electrical Engineering Materials of Design of Electrical Machines

What is the other name of the shackle insulator?(a) String(b) Hanging(c) Spool(d) PostI got this question in an interview.Asked question is from Insulating Materials topic in chapter Electrical Engineering Materials of Design of Electrical Machines

How many classifications of overhead line insulators are there?(a) 3(b) 4(c) 5(d) 6I got this question during a job interview.This is a very interesting question from Insulating Materials topic in chapter Electrical Engineering Materials of Design of Electrical Machines

Glass has lower tensile strength compared to porcelain insulators.(a) True(b) FalseThe question was asked at a job interview.My query is from Insulating Materials in division Electrical Engineering Materials of Design of Electrical Machines

What is the dielectric strength of porcelain insulators?(a) 60 kV/cm(b) 140 kV/cm(c) 50 kV/cm(d) 40 kV/cmThis question was posed to me in an interview for job.Question is from Insulating Materials topic in portion Electrical Engineering Materials of Design of Electrical Machines

Insulation Resistance should be high in insulators.(a) True(b) FalseThis question was posed to me in an interview for job.The doubt is from Insulating Materials in section Electrical Engineering Materials of Design of Electrical Machines

What is the main cause for the failure of overhead line insulators?(a) Surges(b) Flashover(c) Arching(d) GroundingThe question was asked in class test.Enquiry is from Insulating Materials topic in chapter Electrical Engineering Materials of Design of Electrical Machines

What is the example of diamagnetic materials?(a) Quartz(b) Pyrite(c) Montmorillonite(d) BiotiteThe question was posed to me in an interview for job.This intriguing question originated from Magnetic Materials topic in section Electrical Engineering Materials of Design of Electrical Machines

What is the example of ferromagnetic materials is?(a) Magnetite(b) Hematite(c) Nickel(d) BiotiteThis question was posed to me in semester exam.My query is from Magnetic Materials topic in section Electrical Engineering Materials of Design of Electrical Machines

How many classifications of magnetic materials are present?(a) 3(b) 4(c) 5(d) 6I have been asked this question in final exam.I'd like to ask this question from Magnetic Materials in section Electrical Engineering Materials of Design of Electrical Machines

High Reluctance affects the performance of magnetic materials.(a) True(b) FalseThe question was asked in an internship interview.I'm obligated to ask this question of Magnetic Materials topic in section Electrical Engineering Materials of Design of Electrical Machines

What is the unit of reluctance in magnetic materials?(a) Henry/m(b) Weber/m^2(c) Ampere-turns/Weber(d) Ampere-turns/mThe question was posed to me in exam.Question is from Magnetic Materials in chapter Electrical Engineering Materials of Design of Electrical Machines

Is retentivity associated with B-H curve?(a) Yes(b) NoThe question was asked in unit test.The question is from Magnetic Materials in division Electrical Engineering Materials of Design of Electrical Machines

What is the property of magnetic materials?(a) Resistivity(b) Conductivity(c) Permeability(d) DuctilityI had been asked this question in an interview for internship.I'm obligated to ask this question of Magnetic Materials in section Electrical Engineering Materials of Design of Electrical Machines

What is the specific gravity of aluminum?(a) 8.96 gm/cm^3(b) 19.30 gm/cm^3(c) 2.70 gm/cm^3(d) 10.49 gm/cm^3I had been asked this question in examination.My enquiry is from High Conductivity Materials in division Electrical Engineering Materials of Design of Electrical Machines

What is the melting point of aluminum?(a) 660^0C(b) 1085^0C(c) 962^0C(d) 1064^0CThis question was posed to me in unit test.My question is based upon High Conductivity Materials topic in section Electrical Engineering Materials of Design of Electrical Machines

Silver is not used in practical electrical machines.(a) True(b) FalseI have been asked this question in an international level competition.The query is from High Conductivity Materials in chapter Electrical Engineering Materials of Design of Electrical Machines

What is the temperature coefficient of silver?(a) 0.00386 per^0C(b) 0.0034 per^0C(c) 0.00429 per^0C(d) 0.0038 per^0CI got this question in my homework.The query is from High Conductivity Materials in section Electrical Engineering Materials of Design of Electrical Machines

Which material has the highest conductivity of all materials?(a) Silver(b) Copper(c) Gold(d) TungstenThis question was addressed to me during an internship interview.My question is from High Conductivity Materials topic in division Electrical Engineering Materials of Design of Electrical Machines