25 + Interview Questions in Fundamental Aspects Of Electrical Machine Design in Design Of Electrical Machines Page 1 InterviewSolution

1.	What is the function of the leakage flux?(a) contributes to the transfer of energy(b) contributes to the conversion of energy(c) contributes to both the conversion of energy and transfer of energy(d) does not contributes to the conversion or transfer of energyThe question was posed to me in homework.I want to ask this question from Modern Trends in Machine Design & Magnetic Leakage in section Fundamental Aspects of Electrical Machine Design of Design of Electrical Machines
Answer» Right answer is (d) does not contributes to the conversion or transfer of energy The EXPLANATION: The LEAKAGE flux produced due to the low reluctance PATH does not transfer the energy produced. The leakage flux ALSO does not convert the energy in the system.

Discussion

2.	How many factors does the leakage flux affect?(a) 6(b) 7(c) 8(d) 9This question was posed to me by my school principal while I was bunking the class.This interesting question is from Modern Trends in Machine Design & Magnetic Leakage in division Fundamental Aspects of Electrical Machine Design of Design of Electrical Machines
Answer» Right OPTION is (c) 8 Easiest explanation: There are 8 factors which are affected by the leakage flux. They are PERFORMANCE of rotating machines and transformers, excitation demands of salient POLE machines, leakage reactance of windings, forces between windings, voltage regulation of ac generator and transformers, commutation condition in dc machines, STRAY LOAD losses, circulating current in transformer tank walls.

Discussion

3.	How should the air gaps be present in the magnetic circuit according to length and cross section?(a) low length, low cross section(b) high length, high cross section(c) high length, low cross section(d) low length, high cross sectionI have been asked this question in an interview for job.This is a very interesting question from Modern Trends in Machine Design & Magnetic Leakage topic in section Fundamental Aspects of Electrical Machine Design of Design of Electrical Machines
Answer» RIGHT option is (d) LOW LENGTH, HIGH cross section The explanation is: The air gaps should be present in the MAGNETIC circuit in the low length. The air gap should have maximum cross section to reduce the reluctance.

Discussion

4.	In the B-H magnetization curve, the flux density occupies the x axis.(a) true(b) falseThe question was posed to me in an interview for job.My question is taken from Modern Trends in Machine Design & Magnetic Leakage topic in section Fundamental Aspects of Electrical Machine Design of Design of Electrical Machines
Answer» Right answer is (b) false Best explanation: In B-H curve, the flux density occupies the y AXIS ALWAYS. In the magnetization curve, MAGNETIC FIELD intensity is plotted.

Discussion

5.	What is the formula of the leakage coefficient?(a) leakage coefficient = total flux * useful flux(b) leakage coefficient = total flux / useful flux(c) leakage coefficient = useful flux / total flux(d) leakage coefficient = total flux + useful fluxI have been asked this question during an interview.This interesting question is from Modern Trends in Machine Design & Magnetic Leakage in section Fundamental Aspects of Electrical Machine Design of Design of Electrical Machines
Answer» Right CHOICE is (b) leakage COEFFICIENT = total flux / useful flux For explanation: The total flux is the ADDITION of the useful flux and the leakage flux is FIRST calculated. On SUBSTITUTION the leakage coefficient can be obtained.

Discussion

6.	What is the relation between reluctance, flux and mmf of the machine?(a) low reluctance, less flux leakage, high mmf(b) low reluctance, high flux leakage, high mmf(c) high reluctance, high flux leakage, low mmf(d) high reluctance, less flux linkage, high mmfThe question was asked during an online exam.I want to ask this question from Modern Trends in Machine Design & Magnetic Leakage topic in section Fundamental Aspects of Electrical Machine Design of Design of Electrical Machines
Answer» Correct choice is (a) low RELUCTANCE, less flux leakage, high mmf Easiest explanation: The designer’s problem is to provide a path of low reluctance to that of comparatively little flux leaks AWAY. In order to COMPENSATE for the flux leakage, high mmf is MAINTAINED.

Discussion

7.	What are the factors which are considered when the optimal solution involves iterations wherein the values of variables are changed?(a) performance(b) cost constraint(c) performance or cost constraint(d) performance and cost constraintI had been asked this question in my homework.My query is from Modern Trends in Machine Design & Magnetic Leakage topic in section Fundamental Aspects of Electrical Machine Design of Design of Electrical Machines
Answer» The correct choice is (d) performance and cost constraint To explain I would say: The optimal solution involves ITERATION WHEREIN the values of variables are CHANGED. This is done to SATISFY both the performance and cost constraints.

Discussion

8.	The computer aided design is one of the modern techniques which is used to provide accurate and comprehensive design.(a) true(b) falseThe question was asked during a job interview.Query is from Modern Trends in Machine Design & Magnetic Leakage topic in section Fundamental Aspects of Electrical Machine Design of Design of Electrical Machines
Answer» The correct CHOICE is (a) true The best explanation: The computer aided DESIGN is one of the most modern techniques of designing various MACHINES. It is very EASY, accurate, easily changeable and a COMPREHENSIVE design procedure.

Discussion

9.	How are the machines sometimes designed with respect to ratings?(a) design 2 machines with different rating(b) design a series of machines with different ratings to fit into a single frame size(c) design a series of machines with same rating to fit into a single frame size(d) design 2 machines with the same ratingThe question was asked during an interview.I'm obligated to ask this question of Modern Trends in Machine Design & Magnetic Leakage in portion Fundamental Aspects of Electrical Machine Design of Design of Electrical Machines
Answer» Right answer is (B) DESIGN a series of machines with DIFFERENT RATINGS to fit into a single frame size The explanation: The machines are sometimes being DESIGNED as a series of machines with different ratings. They are done so to fit into a single frame size.

Discussion

10.	What is one of the major aspects in the modern day design?(a) design machines to form a group(b) design machines to provided integrated systems(c) design machines to provide a single system(d) design machine to form multiple group with interconnectionThis question was addressed to me by my college professor while I was bunking the class.I need to ask this question from Modern Trends in Machine Design & Magnetic Leakage in division Fundamental Aspects of Electrical Machine Design of Design of Electrical Machines
Answer» CORRECT answer is (c) DESIGN machines to provide a single system The explanation: The major ASPECT of the modern trends is that the design of machines should be many in NUMBER. At the same time, all the machines should FORM a part of a single system.

Discussion

11.	How many design problems are present according to the modern trends in design of electrical machines?(a) 2(b) 3(c) 4(d) 5This question was posed to me by my college director while I was bunking the class.My query is from Modern Trends in Machine Design & Magnetic Leakage topic in division Fundamental Aspects of Electrical Machine Design of Design of Electrical Machines
Answer» Right OPTION is (b) 3 The explanation: There are 3 design problems involved in the MODERN trends in the design. They are ELECTROMAGNETIC design, MECHANICAL design and thermal design.

Discussion

12.	The mechanical parts design is very much important in which type of machines?(a) low speed machines(b) high speed machines(c) medium speed machines(d) low voltage machinesI have been asked this question during an interview.I'd like to ask this question from Design of Machines, Limitations in Design topic in portion Fundamental Aspects of Electrical Machine Design of Design of Electrical Machines
Answer» Correct answer is (B) HIGH SPEED machines To elaborate: The DESIGN of mechanical parts is very important in the high speed machines. It is so important because to REDUCE the mechanical stresses which occurs more in high speed machines.

Discussion

13.	What is the relationship between power factor, current and conductor sizes?(a) poor power factor leads to small amount of current and hence high conductor sizes should be used(b) high power factor leads to small amount of current and hence small conductor sizes should be used(c) poor power factor leads to high amount of current and hence high conductor sizes should be used(d) high factor leads to small amount of current and hence high conductor sizes should be usedThe question was posed to me during an online interview.My question is based upon Design of Machines, Limitations in Design in chapter Fundamental Aspects of Electrical Machine Design of Design of Electrical Machines
Answer» The correct OPTION is (c) poor power factor leads to HIGH amount of CURRENT and HENCE high conductor sizes should be used To explain I would say: The power factor is ONE of the limitations in the design of the machine. The poor power factor leads to high amount of current and in turn large conductor sizes have to be used.

Discussion

14.	What is the relationship between efficiency and the operating costs?(a) efficiency is directly proportional to the square of the operating cost(b) efficiency is directly proportional to the operating costs(c) efficiency is indirectly proportional to the operating costs(d) efficiency is indirectly proportional to the square of the operating costsI had been asked this question during an internship interview.This question is from Design of Machines, Limitations in Design topic in chapter Fundamental Aspects of Electrical Machine Design of Design of Electrical Machines
Answer» Right CHOICE is (c) efficiency is indirectly PROPORTIONAL to the operating costs Explanation: Efficiency is one of the limitations in the DESIGN of the MACHINES. The efficiency should be as high as possible to reduce the initial COST.

Discussion

15.	What are the subjects to which the design of electrical machines is compared to?(a) science and maths(b) maths and art(c) maths(d) science and artThis question was posed to me during a job interview.This interesting question is from Modern Trends in Machine Design & Magnetic Leakage topic in division Fundamental Aspects of Electrical Machine Design of Design of Electrical Machines
Answer» The correct option is (d) science and ART Best explanation: The design of electrical machines is basically COMPARED to as a science. It is also compared to as an art because of the DESIGNING.

Discussion

16.	How many types of stresses are present in the machine?(a) 2(b) 3(c) 4(d) 5I got this question by my college professor while I was bunking the class.The above asked question is from Design of Machines, Limitations in Design in portion Fundamental Aspects of Electrical Machine Design of Design of Electrical Machines
Answer» The CORRECT option is (B) 3 Explanation: There are basically 3 STRESSES available in the machine. They are ELECTRICAL stress, mechanical stress and thermal stress.

Discussion

17.	What happens if the insulating material is operated beyond the maximum allowable temperature?(a) the insulation gets damaged(b) the insulation is boosted(c) the insulating materials peels off(d) the lifetime is drastically reducedThe question was asked by my school principal while I was bunking the class.The doubt is from Design of Machines, Limitations in Design topic in portion Fundamental Aspects of Electrical Machine Design of Design of Electrical Machines
Answer» Correct answer is (d) the lifetime is drastically reduced To explain I would say: The TEMPERATURE rise is ONE of the limitations PRESENT in the design of machines. The insulating material when OPERATED beyond the maximum temperature leads to the lifetime being drastically reduced.

Discussion

18.	How does the saturation levels limit the design?(a) saturation levels decrease the flux density(b) saturation levels increase the flux density(c) saturation levels provides no flux density(d) saturation levels provide very high flux densityI have been asked this question in a job interview.This interesting question is from Design of Machines, Limitations in Design in division Fundamental Aspects of Electrical Machine Design of Design of Electrical Machines
Answer» The CORRECT choice is (d) saturation LEVELS provide very high flux density Explanation: The MAXIMUM ALLOWABLE flux density to be used is determined by the saturation levels of ferromagnetic materials. The saturation levels provides high flux density which results in high COST.

Discussion

19.	How many limitations are present in the design of the machine?(a) 7(b) 8(c) 9(d) 10I had been asked this question in class test.My question is taken from Design of Machines, Limitations in Design topic in chapter Fundamental Aspects of Electrical Machine Design of Design of Electrical Machines
Answer» Correct option is (c) 9 Best explanation: There are basically 9 LIMITATIONS in the DESIGN of the machines. They are SATURATION, temperature rise, insulation, efficiency, mechanical parts, commutation, POWER factor, consumer specification, STANDARD specification.

Discussion

20.	How many parts are used in the design of the machines?(a) 2(b) 3(c) 4(d) 5This question was addressed to me in an online interview.The question is from Design of Machines, Limitations in Design topic in division Fundamental Aspects of Electrical Machine Design of Design of Electrical Machines
Answer» Right option is (d) 5 For explanation I would say: There are 5 parts involved in the design of the machine. They are magnetic CIRCUIT, ELECTRIC circuit, DIELECTRIC circuit, thermal circuit, MECHANICAL parts.

Discussion

21.	What are the factors which are important in design when it comes to the machines used in power systems?(a) reliability(b) durability(c) cost(d) reliability and durabilityThe question was posed to me during an internship interview.Question is taken from Design of Machines, Limitations in Design in portion Fundamental Aspects of Electrical Machine Design of Design of Electrical Machines
Answer» Right ANSWER is (d) RELIABILITY and durability The best explanation: The machines USED in the power system are given weightage to the reliability and durability. THUS the COST of the machines are not taken into account.

Discussion

22.	What is the condition of the good design?(a) machine having operating life of 5-10 years(b) machine having operating life of 10-15 years(c) machine having operating life of 15-20 years(d) machine having operating life of 20-30 yearsI got this question in an interview for internship.This key question is from Design of Machines, Limitations in Design topic in section Fundamental Aspects of Electrical Machine Design of Design of Electrical Machines
Answer» Right OPTION is (d) machine having operating life of 20-30 years The best explanation: The machine having operating life span of 20-30 years is ONE of the signs of good DESIGN. This type of MACHINES have initial cost to be low.

Discussion

23.	How many considerations are present in the design?(a) 6(b) 4(c) 5(d) 3I had been asked this question in semester exam.My question comes from Design of Machines, Limitations in Design in section Fundamental Aspects of Electrical Machine Design of Design of Electrical Machines
Answer» Correct ANSWER is (d) 3 Best explanation: There are 3 CONSIDERATIONS present in the design of the machine. They are cost, DURABILITY, compliance with PERFORMANCE criteria as LAID down in specifications.

Discussion

24.	What are the factors which are employed in the engineering design?(a) application of science(b) application of science and technology(c) application of science and innovation(d) application of science, technology and innovationThis question was posed to me during an online interview.My query is from Design of Machines, Limitations in Design in chapter Fundamental Aspects of Electrical Machine Design of Design of Electrical Machines
Answer» CORRECT answer is (d) application of science, TECHNOLOGY and innovation For EXPLANATION: Design is the process of producing the creative PHYSICAL relationship of THEORETICAL concepts. The application of science, technology and innovation is what called as engineering design.

Discussion

25.	What does design mean?(a) creative physical relationship of theoretical concepts(b) producing the hardware(c) idea made into a drawing(d) idea laid out as a thesisI had been asked this question by my college professor while I was bunking the class.This interesting question is from Design of Machines, Limitations in Design topic in division Fundamental Aspects of Electrical Machine Design of Design of Electrical Machines
Answer» CORRECT OPTION is (a) creative PHYSICAL relationship of theoretical concepts Easy explanation: Design is one of the important steps in the MANUFACTURING of a product. It INVOLVES the process of producing the creative physical relationship of theoretical concepts.

Discussion

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How many limitations are present in the design of the machine?(a) 7(b) 8(c) 9(d) 10I had been asked this question in class test.My question is taken from Design of Machines, Limitations in Design topic in chapter Fundamental Aspects of Electrical Machine Design of Design of Electrical Machines

How many parts are used in the design of the machines?(a) 2(b) 3(c) 4(d) 5This question was addressed to me in an online interview.The question is from Design of Machines, Limitations in Design topic in division Fundamental Aspects of Electrical Machine Design of Design of Electrical Machines

How many considerations are present in the design?(a) 6(b) 4(c) 5(d) 3I had been asked this question in semester exam.My question comes from Design of Machines, Limitations in Design in section Fundamental Aspects of Electrical Machine Design of Design of Electrical Machines