InterviewSolution

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51.	What is MMF?(a) Magnetic Machine Force(b) Magnetomotive Force(c) Magnetic Motion Force(d) Magnetomotion ForceI got this question in exam.The question is from Ohm’s Law for a Magnetic Circuit in chapter Simple Magnetic Circuits of Basic Electrical Engineering
Answer» Correct choice is (B) MAGNETOMOTIVE Force Explanation: MMF stands for magnetomotive force. ACTUALLY, it is not a force. It is analogous to POTENTIAL in electric FIELD.

52.	Can we apply Kirchhoff’s law to magnetic circuits?(a) Yes(b) No(c) Depends on the circuit(d) Insufficient information providedThis question was addressed to me by my college professor while I was bunking the class.Question is taken from Ohm’s Law for a Magnetic Circuit in chapter Simple Magnetic Circuits of Basic Electrical Engineering
Answer» Correct ANSWER is (a) Yes Best explanation: Magnetic circuits have an EQUIVALENT to the POTENTIAL difference of electric circuits. This is the magnetic potential difference which ALLOWS US to apply Kirchhoff’s laws to magnetic circuit analysis.

53.	Ohm’s law for magnetic circuits is _________(a) F=ϕS(b) F=ϕ/S(c) F=ϕ^2S(d) F=ϕ/S^2The question was posed to me in final exam.My enquiry is from Ohm’s Law for a Magnetic Circuit in section Simple Magnetic Circuits of Basic Electrical Engineering
Answer» Right option is (a) F=ϕS Easiest explanation: OHM’s LAW for magnetic circuits STATES that the MMF is directly proportional to the magnetic FLUX where reluctance is the constant of proportionality.

54.	As the magnetic flux density increases, the reluctance _____________(a) Increases(b) Decreases(c) Remains the same(d) Becomes zeroI have been asked this question by my college professor while I was bunking the class.This intriguing question originated from Reluctance topic in chapter Simple Magnetic Circuits of Basic Electrical Engineering
Answer» Right OPTION is (B) Decreases The explanation: Reluctance is INVERSELY proportional to the magnetic flux density, HENCE as magnetic flux density increases, reluctance decreases.

55.	Reluctance is ________________ to the area of cross section the material.(a) Directly proportional(b) Inversely proportional(c) Not related(d) EqualThe question was posed to me in an interview for job.The doubt is from Reluctance in portion Simple Magnetic Circuits of Basic Electrical Engineering
Answer» The correct option is (b) INVERSELY proportional To explain: The formula for RELUCTANCE is: S = L/(µ0 µr*A). From the formula, we can see that reluctance is inversely proportional to the area of cross section of the MATERIAL.

56.	A substance whose permeability is more than the permeability of free space is?(a) Diamagnetic(b) Paramagnetic(c) Ferromagnetic(d) Both paramagnetic and ferromagneticI have been asked this question during an internship interview.This question is from Permeability of Free Space or Magnetic Constant in section Simple Magnetic Circuits of Basic Electrical Engineering
Answer» Right answer is (d) Both paramagnetic and ferromagnetic Explanation: Relative permeability=1+Magnetic susceptibility Since both paramagnetic and ferromagnetic MATERIALS have POSITIVE susceptibility, their relative permeability is greater than UNITY i.e. their permeability is more than the permeability of free SPACE.

57.	Hysteresis loss is determined from _______(a) B/H curve(b) H/B curve(c) BH curve(d) B^2H curveI had been asked this question in an interview.Asked question is from Determination of the B/H Characteristic topic in chapter Simple Magnetic Circuits of Basic Electrical Engineering
Answer» Right OPTION is (C) BH curve The best I can explain: Hysteresis loss is basically a heat loss due to the reversal of magnetisation of the transformer core whenever it is SUBJECTED to a changing magnetic field. It can be DETERMINED using the B/H curve.