100 TOP MOST MAGNETISM and ELECTROMAGNETISM - Electrical Engineering Multiple choice Questions and Answers Electrical Engineering Multiple Choice Questions.pdf

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Home » Electrical Engineering Multiple Choice Questions » 100 TOP MOST MAGNETISM and ELECTROM ELECTROMAGNE AGNETI TISM SM – Electrical Electrical Engineerin Engin eering g Mu ltiple ch ch oice oice Questions an d Answers

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100 TOP MOST MAGNETISM and ELECTROMAGN ELECTROMAGNETISM ETISM – Electrical Electrical Engineering Engineerin g Mul ulti tiple ple choice Questions an Questions and d A nswers nswers BROOKE BOND, RED BROOKE LABEL TEA , 500G

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1. Tesla is a unit of (a) field strength (b) inductance (c) flux density

(d) flux http: tp://e //engine gineeringin ringinte terv rvie iew wque questio stion ns.co s.com m/magne gnetism tism-a -an nd-ele -elect ctro rom magne gnetism-e ism-ele lect ctric rica al-en l-engine gineering-m ring-mu ultip ltiple le-ch -cho oice-qu ice-que estio stion ns-an s-and-an -answe swers/

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Ans: c 2. A permeable substance is one (a) which is a good conductor (6) which is a bad conductor (c) which is a strong magnet (d) through which the magnetic ma gnetic lines of of force f orce can pass very easily Ans: d 3. The materials mat erials having low retentivity are suitable for making (a) weak magnets (b) temporary magnets (c) permanent magnets (d) none of the above Ans: b 4. A magnetic mag netic field exists around (a) iron (b) copper (c) aluminium (d) moving charges

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Ans: d

Find us on 5. Ferrites are materials. (a) paramagnetic

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(b) diamagnetic (c) ferromagnetic (d) none of the above Ans: c 6. Air gap has_______eluctance ha s_______eluctance as compared to iron or or steel steel path pa th (a) little (b) lower http: tp://e //engine gineeringin ringinte terv rvie iew wque questio stion ns.co s.com m/magne gnetism tism-a -an nd-ele -elect ctro rom magne gnetism-e ism-ele lect ctric rica al-en l-engine gineering-m ring-mu ultip ltiple le-ch -cho oice-qu ice-que estio stion ns-an s-and-an -answe swers/

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(c) higher (d) zero Ans: b 7. The T he direction of magnetic lines of force is (a) from south pole to north pole (b) from north pole to south pole (c) from one end of the magnet mag net to another (d) none of the above Ans: b 8. Which of the following is a vector quantity ? (a) Relative permeability (b) Magnetic field f ield intensity intensity (c) Flux density (d) Magnetic potential Ans: b 9. The T he two conductors of a transmission transmission line line carry equal current I in opposite directions. directions. The force on each eac h conductor is (a) proportional proportional to to 7 (b) proportional to X (c) proportional proportional to distance d istance between the conductors (d) inversely proportional to I Ans: b 10. 10. A material which w hich is slightly repelled repelled by a magnetic ma gnetic field is known known as as (a) ferromagnetic material (b) diamagnetic material (c) paramagnetic material (d) conducting conducting material ma terial Ans: b 11. 11. When W hen an iron piece is placed in a magnetic field http: tp://e //engine gineeringin ringinte terv rvie iew wque questio stion ns.co s.com m/magne gnetism tism-a -an nd-ele -elect ctro rom magne gnetism-e ism-ele lect ctric rica al-en l-engine gineering-m ring-mu ultip ltiple le-ch -cho oice-qu ice-que estio stion ns-an s-and-an -answe swers/

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(a) the magnetic lines of force will bend away a way from f rom their usual paths in order to go away from the piece (b) the magnetic lines of of force f orce will bend aw ay from their usual paths pat hs in order to pass through through the piece (c) the magnetic field will not be affected aff ected (d) the iron piece will break Ans: b 12. Fleming’s left left hand ha nd rule is used to find (a) direction of of magnetic ma gnetic field due to t o current carrying conductor (b) direction of flux in a solenoid solenoid (c) direction of of force f orce on a current carrying conductor in a magnetic field (d) polarity of of a magnetic pole Ans: c 13. 13. The T he ratio of intensity intensity of magnetisation to the magnetisation force is known as (a) flux dens d ensity ity (b) susceptibility (c) relative permeability (d) none of the above Ans: b 14. Magnetisin Ma gnetising g steel is normals normals difficult diffic ult because beca use (a) it corrodes easily (6) it has high permeability (c) it has high specific gravity gra vity (d) it has low permeability Ans: d 15. The left hand rule correlates to (a) current, induced e.m.f. and a nd direction of force on a conductor (b) magnetic field, electric field and direction of force on a http: tp://e //engine gineeringin ringinte terv rvie iew wque questio stion ns.co s.com m/magne gnetism tism-a -an nd-ele -elect ctro rom magne gnetism-e ism-ele lect ctric rica al-en l-engine gineering-m ring-mu ultip ltiple le-ch -cho oice-qu ice-que estio stion ns-an s-and-an -answe swers/

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conductor (c) self self induction, mutual induction and direction of force on a conductor (d) current, magnetic field and a nd direction of force on a conductor Ans: d 16. The unit of relative permeability permeability is (a) henry/metre (b) henry (c) henry/sq. m (d) it is dimensionless d imensionless Ans: d 17. A conductor of length L has ha s current I passing through it, when it is placed parallel to a magnetic field. The force experienced by the conductor will be (a) zero (b) BLI (c) B2LI (d) BLI2 Ans: a 18. The force between two long pa rallel conductors is inversely proportional to (a) radius of conductors (b) current in one conductor (c) product of current in two conductors (d) distance between the conductors Ans: d 19. Materials Ma terials subjected to rapid reversal reversal of magnetism ma gnetism should have (a) large area oiB-H loop (b) high permeability and low hysteresis loss (c) high co-ercivity and high retentivity http: tp://e //engine gineeringin ringinte terv rvie iew wque questio stion ns.co s.com m/magne gnetism tism-a -an nd-ele -elect ctro rom magne gnetism-e ism-ele lect ctric rica al-en l-engine gineering-m ring-mu ultip ltiple le-ch -cho oice-qu ice-que estio stion ns-an s-and-an -answe swers/

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(d) high co-ercivity and low density Ans: b 20. Indicate which w hich of the following material does not retain magnetis mag netism m permanently p ermanently.. (a) Soft iron (b) Stainless steel (e) Hardened steel (d) None of the above Ans: a 21. The main ma in constituent constituent of permalloy is (a) cobalt (b) chromium (c) nickel (d) tungsten Ans: c 22. The use of permanent magnets is. not made in (a) magnetoes (6) energy meters (c) transformers (d) loud-speakers Ans: c 23. Paramagnetic ma terials have relative relative permeability (a) slightly less than unity (b) equal to unity (c) slightly more than unity (d) equal equal to that ferromagnetic mate rials Ans: c 24. Degaussing is the process of of (a) removal removal of magnetic ma gnetic impurities (b) removing gases from the materials (c) remagnetising remagnetising metallic parts p arts http: tp://e //engine gineeringin ringinte terv rvie iew wque questio stion ns.co s.com m/magne gnetism tism-a -an nd-ele -elect ctro rom magne gnetism-e ism-ele lect ctric rica al-en l-engine gineering-m ring-mu ultip ltiple le-ch -cho oice-qu ice-que estio stion ns-an s-and-an -answe swers/

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(d) demagnetising demagnetising metallic parts p arts Ans: 25. Substances S ubstances which have ha ve permeability permeability less than the permeability of free space are known as (a) ferrom f erromagnetic agnetic (b) paramagnetic (c) diamagnetic (d) bipolar Ans: c 26. Two infinitely long parallel conductors in vacuu vacuum m any separated 1 metre between centers >then a current of 1 ampere flows the. uk each conductor, produce p roduce on each other a force of (a) 2 x 1(T2 N/m) (b) 2 x KT3 N/m (c) 2 x 10″5 N/m (d) 2x 1(T7 N/m) Ans: d 27. In the left hand rule, f orefinger always represents represents (a) voltage (b) current (c) magnetic field (d) direction of force on the conductor Ans: c 28. Which Whic h of the following is a ferromagnetic material ? (a) Tungsten (b) Aluminium (c) Copper (d) Nickel Ans: d 29. Ferrites Ferrites are a sub-group of http: tp://e //engine gineeringin ringinte terv rvie iew wque questio stion ns.co s.com m/magne gnetism tism-a -an nd-ele -elect ctro rom magne gnetism-e ism-ele lect ctric rica al-en l-engine gineering-m ring-mu ultip ltiple le-ch -cho oice-qu ice-que estio stion ns-an s-and-an -answe swers/

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(a) non-magnetic non-magnetic materials (6) ferro-magnetic ferro-magnetic materials (c) paramagnetic materials (d) ferri-magnetic materials Ans: d 30. Gilbert is a unit of (a) electromotive force (6) magnetomotive force (c) conductance (d) permittivity Ans: b 31. 31. The working w orking of a meter is based on the use of a permanent magnet. In order to protect the meter functioning from stray magnetic fields (a) meter is surrounded surrounded by b y strong magnetic f ields (b) a soft iron shielding is used (c) a plastic shielding is provided (d) a shielding of anona non-magnetic magnetic material is used Ans: b 32. Reciprocal of permeability is (a) reluctivity (b) susceptibility (c) permittivity (d) conducta conductance nce Ans: a 33. The relative permeability is less than unity is case of (a) ferromagnetic materials (b) ferrites (c) non-ferrous materials (d) diamagnetic materials Ans: d

http: tp://e //engine gineeringin ringinte terv rvie iew wque questio stion ns.co s.com m/magne gnetism tism-a -an nd-ele -elect ctro rom magne gnetism-e ism-ele lect ctric rica al-en l-engine gineering-m ring-mu ultip ltiple le-ch -cho oice-qu ice-que estio stion ns-an s-and-an -answe swers/

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34. Which of the following is the unit of magnetic flux density ? (a) weber (b) lumens (c) tesla (d) none of the above Ans: c 35. The magnetism left left in the iron after exciting field f ield has been removed is known as (a) permeance (b) residual magnetism mag netism (c) susceptance (d) reluctance Ans: b 36. Which of the following is not a unit of flux? (a) Maxwell (b) Telsa (c) Weber (d) All of the above Ans: b 37. Which of the following is expected to have the maximum permeability ? (a) Brass (b) Copper (c) Zinc (d) Ebonite Ans: d 38. One telsa is equal to (a) 1 Wb/mm2 (b) 1 Wb/m (c) 1 Wb/m2 (d) 1 mWb/m2 http: tp://e //engine gineeringin ringinte terv rvie iew wque questio stion ns.co s.com m/magne gnetism tism-a -an nd-ele -elect ctro rom magne gnetism-e ism-ele lect ctric rica al-en l-engine gineering-m ring-mu ultip ltiple le-ch -cho oice-qu ice-que estio stion ns-an s-and-an -answe swers/

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Ans: c 39. Out of the following statements, concerning concerning an electric field, which w hich statement is not true ? (a) The electric intensity is a vector quantity (b) The electric field intensity at a point is numerically equal to the force exerted upon a charge placed at that point (c) An An electric field is defined as a point in space at w hich an electric charge would experience ex perience a force (d) Unit field intensity in the exertion of a force of one newton on a charge of one coulomb coulomb Ans: b 40. When a magnet is in motion relative relative to a coil the induced e.m.f. does not not depend upon (a) resistance of the coil (b) motion of the magnet (c) number of turns of the coil (d) pole strength of the magnet Ans: a 41. One maxwell is equal to (a) 10 webers (b) 10 webers (c) 10 webers (d) 10 webers Ans: d 42. When two ends of a circular circula r uniform wire are joined joined to the terminals of a battery, b attery, the field at the center of the circle (a) will be zero (b) will be infinite (c) will depend on the amount of e.m.f. applied (d) will depend on the radius of the circle http http:/ ://e /engin ngine eeringint eringinte ervie rview wquest questio ion ns.co s.com m/ma /magnetis gnetism m-and-e -and-ele lect ctro rom magnet agnetism ism-e -elec lectric trical al-en -engine gineeri ering-m ng-mul ultip tiple le-ch -choic oice-qu e-ques estio tion ns-an s-and-answ -answe ers/

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Ans: d 43. Susceptibility S usceptibility is positive positive for (a) non-magnetic substances (b) diamagnetic substances (c) ferromagnetic substances (d) none of the above Ans: c 44. Two long parallel para llel conductors carry 100 100 A. A. If the conductors are separated by 20 mm, the f orce per meter of of length of each conductor will be (a) 100 N (b) 10 N (c) 1 N (d) 0.1 N Ans: d 45. A 300 mm long conductor is carrying a current of 10 A and is situated at right angles a ngles to a magnetic field having a flux density of of 0.8 T ; the force on the conductor will be be (a) 240 N (6) 24 N (c) 2.4 N (d) 0.24 0.24 N Ans: c 46. A 200 turn coil having an axial axia l length of 30 mm and a radius of 10 mm is pivoted pivoted in a magnetic mag netic field having a flux f lux density of 0.8 T. If the coil carries a current of 0.5 A, the torque acting on the coil will be (a) 8 N-m (b) 0.48 N-m (e) 0.048 N-m (d) 0.0048 N-m [Hint. Torque = 2BIlNr 2 BIlNr N-m] http http:/ ://e /engin ngine eeringint eringinte ervie rview wquest questio ion ns.co s.com m/ma /magnetis gnetism m-and-e -and-ele lect ctro rom magnet agnetism ism-e -elec lectric trical al-en -engine gineeri ering-m ng-mul ultip tiple le-ch -choic oice-qu e-ques estio tion ns-an s-and-answ -answe ers/

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Ans: c 47. The electromagnet has 50 turns and a current of 1A flows through the coil. If the length of the magnet mag net circuit is 200 mm, what is the magnetic field strength ? (a) 2500 AT/m (b) 250 AT/m (c) 25 AT/m (d) 2.5 AT/m Ans: b 48. What Wha t is the magnitude and the direction of force per 1.1m length length of a pair p air of conductors of a direct current cu rrent linecarrying linecarrying 10 amperes and spaced 100 100 mm apart apa rt ? (a) 22 x 10″8 10″8 N (b) 22 x 10″7 N (c) 22 x 10-6 10-6 N (d) 22 x 10″5 N Ans: d 49. A square cross-sectio cross-sectional nal magnet mag net has a pole strength strength of 1 x 10 Wb and a nd cross sectional sectional area of 2 0 mm x 20 mm. What Wha t is the strength at a t a distanc d istancee of 100 mm from the unit pole in air ? (a) 63.38 N/Wb (b) 633.8 N/Wb (c) 6338 N/Wb (d) 63380 N/Wb Ans: c 50. The unit of flux is the same same as that of (a) reluctance (b) resistance (c) permeance (d) pole strength Ans: d http http:/ ://e /engin ngine eeringint eringinte ervie rview wquest questio ion ns.co s.com m/ma /magnetis gnetism m-and-e -and-ele lect ctro rom magnet agnetism ism-e -elec lectric trical al-en -engine gineeri ering-m ng-mul ultip tiple le-ch -choic oice-qu e-ques estio tion ns-an s-and-answ -answe ers/

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51. Unit for quantity qua ntity of electricity is (a) ampere-hour (b) watt (c) joule (d) coulomb Ans: d 52. The T he Biot-savart’s Biot-savart’s law is a general g eneral modification of (a) Kirchhoffs law (b) Lenz’s law (c) Ampere’s law (d) Farada Faraday’s y’s laws laws Ans: c 53. The most effective and quickest may of making ma king a magnet from soft iron is by (a) placing it inside a coil c oil carrying current (b) induction (c) the use of permanent magnet (d) rubbing with another a nother magnet Ans: a 54. The commonly used material for f or shielding or screening screening magnetism is (a) copper (b) aluminium (c) soft iron (d) brass Ans: c 55. If a copper disc is rotated rotated rapidly rapid ly below a freely suspended suspended magnetic needle, needle, the magnetic needle shall start rotating with a velocity velocity (a) less less than that of disc but bu t in opposite direction (b) equal to that of disc and a nd in the same direction direction (c) equal to that of disc and in the opposite direction direction http http:/ ://e /engin ngine eeringint eringinte ervie rview wquest questio ion ns.co s.com m/ma /magnetis gnetism m-and-e -and-ele lect ctro rom magnet agnetism ism-e -elec lectric trical al-en -engine gineeri ering-m ng-mul ultip tiple le-ch -choic oice-qu e-ques estio tion ns-an s-and-answ -answe ers/

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(d) less less than that of disc and in the same direction Ans: d 56. A permanent magnet (a) attracts attrac ts some substances and repels others (b) attracts all paramagnetic parama gnetic substances and repels others others (c) attracts only ferromagnetic substances (d) attracts ferromagnetic f erromagnetic substances and repels all others Ans: a 57. The T he retentivity retentivity (a property) of material is useful f or the construction of (a) permanent magnets (b) transformers (c) non-magnetic non-magnetic substances (d) electromagnets Ans: a 58. The relative permeability of materials ma terials is not constant. constant. (a) diamagnetic (b) paramagnetic (c) ferromagnetic (d) insulating Ans: c 59. The materials mat erials are a bit inferior conductors of of magnetic mag netic flux than air. (a) ferrom f erromagnetic agnetic (b) paramagnetic (c) diamagnetic (d) dielectric Ans: c 60. Hysteresis Hysteresis loop loop in case ca se of magnetically hard materials is more in shape as compared to magnetically soft materials. http http:/ ://e /engin ngine eeringint eringinte ervie rview wquest questio ion ns.co s.com m/ma /magnetis gnetism m-and-e -and-ele lect ctro rom magnet agnetism ism-e -elec lectric trical al-en -engine gineeri ering-m ng-mul ultip tiple le-ch -choic oice-qu e-ques estio tion ns-an s-and-answ -answe ers/

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(a) circular (b) triangular (c) rectangula rectangularr (d) none of the above Ans: c 61. A rectangular magnet of magnetic ma gnetic moment M is cut into two piece of same length, the magnetic mag netic moment of each piece will be (a) M (6) M/2 (c) 2 M (d) M/4 Ans: b 62. A keeper is used to (a) change the direction of magnetic lines (b) amplify flux (c) restore lost flux (d) provide provide a closed path for flux Ans: d 63. Magnetic Mag netic moment moment is a (a) pole strength (6) universal constant (c) scalar quantity (d) vector vector quantity qua ntity Ans: d 64. The change of cross-sectional cross-sectional area of conductor in magnetic field will affect (a) reluctance of conductor (b) resistance resistance of conductor (c) (a) and (b) both in the same way (d) none of the above Ans: c http http:/ ://e /engin ngine eeringint eringinte ervie rview wquest questio ion ns.co s.com m/ma /magnetis gnetism m-and-e -and-ele lect ctro rom magnet agnetism ism-e -elec lectric trical al-en -engine gineeri ering-m ng-mul ultip tiple le-ch -choic oice-qu e-ques estio tion ns-an s-and-answ -answe ers/

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65. The uniform magnetic field is (a) the field of a set of parallel conductors (b) the field of a single conductor (c) the field in which all lines of of magnetic mag netic flux are a re parallel and equidistant (d) none of the above Ans: c 66. The magneto-motive magneto-motive force is (a) the voltage across the two ends of exciting exc iting coil (b) the flow of an a n electric current (c) the sum of all currents embraced by one line of magnetic field (d) the passage passage of magnetic mag netic field through an exciting coil c oil Ans: c 67. What will w ill be the current passing through through the ring shaped air cored coil when w hen number of turns is 800 and ampere turns are 3200 ? (a) 2 (b) 4 (c) 6 (d) 8 Ans: b 68. What will be the magnetic potential difference across the air gap of 2 cm length in magnetic field f ield of 200 AT/m AT/m ? (a) 2 AT (b) 4 AT (c) 6 AT (d) 10 AT Ans: b 69. Which of the following f ollowing statements statements is correct correct ? (a) The magnetic flux inside an exciting coil is lower than its outside surface http http:/ ://e /engin ngine eeringint eringinte ervie rview wquest questio ion ns.co s.com m/ma /magnetis gnetism m-and-e -and-ele lect ctro rom magnet agnetism ism-e -elec lectric trical al-en -engine gineeri ering-m ng-mul ultip tiple le-ch -choic oice-qu e-ques estio tion ns-an s-and-answ -answe ers/

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(6) The magnetic flux inside an exciting coil is zero (e) The magnetic flux f lux inside the exciting coil is greater than its outside surface (d) The magnetic flux inside the exciting coil is same as on its outside surface Ans: d 70. A certain amount of current flows through a ringshaped coil with fixed fix ed number of turns. How does the magnetic induction induct ion B varies inside inside the coil if an iron core is threaded into coil without dimensional change of coil ? (a) Decreases (b) Increases (c) Remains same (d) First increases and then decreases depending on the depth of iron in¬sertion Ans: b 71. The magnetic reluctance of a material (a) decreases with increasing cross sectional area of material (6) increases with increasing cross-sec-tional area of material (c) does not vary with increasing cross-sectional area of material (d) any of the above a bove Ans: a 72. The initial permeability of an iron rod is (a) the highest permeability of the iron rod (b) the lowest permeability of the iron rod (c) the permeability at the end of the iron rod (d) the permeability almost in non-magnetised state Ans: d 73. How does the magnetic compass needle behave in a http http:/ ://e /engin ngine eeringint eringinte ervie rview wquest questio ion ns.co s.com m/ma /magnetis gnetism m-and-e -and-ele lect ctro rom magnet agnetism ism-e -elec lectric trical al-en -engine gineeri ering-m ng-mul ultip tiple le-ch -choic oice-qu e-ques estio tion ns-an s-and-answ -answe ers/

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magnetic field ? (a) It assures a position position right angle to magnetic ma gnetic field (b) It starts rotating (c) It assures a position position which follows f ollows a line of magnetic flux (d) None of the above Ans: c 74. In a simple magnetic field the strength of magnet flux (a) is constant constant and a nd has same value in energy part of the magnetic field (6) increases continuously continuously from initial value to final value (c) decreases continuously continuously from initial value to final value (d) first increases and then decreases till it becomes zero Ans: d 75. The stray line of magnetic flux is defined as (a) a line vertical vertical to the f lux lines (b) the mean length of a ring shaped shap ed coil (c) a line of magnetic flux f lux in a non-uniform non-uniform field (d) a line of of magnetic mag netic flux which w hich does not not follow the designed designed path pa th Ans: d 76. The bar magnet has (a) the dipole moment (b) monopole moment (c) (a) and (b) both (d) none of the above Ans: a 77. Which of the following materials are diamagnetic ? (a) Silver (b) Copper (c) Silver and copper (d) Iron http http:/ ://e /engin ngine eeringint eringinte ervie rview wquest questio ion ns.co s.com m/ma /magnetis gnetism m-and-e -and-ele lect ctro rom magnet agnetism ism-e -elec lectric trical al-en -engine gineeri ering-m ng-mul ultip tiple le-ch -choic oice-qu e-ques estio tion ns-an s-and-answ -answe ers/

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Ans: c 78. Which W hich of the following f ollowing type of materials are not very important for engineering applications applica tions ? (a) Ferromagnetic (b) Paramagnetic (c) Diamagnetic (d) None of the above Ans: c 79. The susceptibility of of paramagnetic pa ramagnetic materials generally lies between (a) KT3 and 1CT6 (b) 1CT3 and 1CT7 (c) KT4 and KT8 (d) 10″2 10″2 and KT5 K T5 Ans: a 91. For which of the following materials the saturation value is the highest hig hest ? (a) Ferromagnetic Ferromagnetic materials (6) Paramag Paramagnetic netic materials (c) Diamagnetic materials (d) Ferrites Ans: d 92. The magnetic materials exhibit the property of magnetisation because of (a) orbital motion of electrons electrons (b) spin of electrons (c) spin of nucleus (d) either of these (e) all of the above a bove Ans: c 93. For which of the following materials the net magnetic http http:/ ://e /engin ngine eeringint eringinte ervie rview wquest questio ion ns.co s.com m/ma /magnetis gnetism m-and-e -and-ele lect ctro rom magnet agnetism ism-e -elec lectric trical al-en -engine gineeri ering-m ng-mul ultip tiple le-ch -choic oice-qu e-ques estio tion ns-an s-and-answ -answe ers/

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moment should be zero ? (a) Diamagnetic materials (b) Ferrimagnetic Ferrimagnetic materials ma terials (c) Antiferromagnetic Antiferromagnetic materials ma terials (d) Antiferrimagnetic Antiferrimagnetic materials Ans: c 94. The attraction capacity of electromagnet will increase if the (a) core length increases i (b) core area increases (c) flux density decreases decreases (d) flux density increases Ans: d 95. Which W hich of the following f ollowing statements is correct ? (a) The conductivity of ferrites f errites is is better than ferromagnetic materials (b) The conductivity of ferrom f erromagnetic agnetic materials ma terials is better than ferrites (c) The conductivity of ferrites is very high (d) The conductivity of ferrites is same as that of ferromagnetic materials Ans: a 96. Temporary magnets are used in (a) loud-speakers (b) generators (c) motors (d) all of the above ab ove Ans: d 97. Main causes c auses of noisy soleno solenoid id are (a) strong strong tendency of fan out of laminations at the end caused by repulsion among magnetic lines of force (b) uneven uneven bearing surface, caused by dirt or uneven wear http http:/ ://e /engin ngine eeringint eringinte ervie rview wquest questio ion ns.co s.com m/ma /magnetis gnetism m-and-e -and-ele lect ctro rom magnet agnetism ism-e -elec lectric trical al-en -engine gineeri ering-m ng-mul ultip tiple le-ch -choic oice-qu e-ques estio tion ns-an s-and-answ -answe ers/

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between betw een moving and stationary sta tionary parts pa rts (c) both of above ab ove (d) none of the above Ans: c 98. Strength of an a n electromagnet electromagnet can be b e increased increased by (a) increasing the cross-sectional area (b) increasing increasing the number numb er of turns (c) increasing current supply (d) all above methods Ans: 99. Core of an electromagnet should should have ha ve (a) low coercivity coercivity (6) high susceptibility (c) both of the above ab ove (d) none of the above Ans: c 100. 100. Magnetism of a magnet can ca n be destroyed destroyed by (a) heating (b) hammering (c) by inductive action of another magnet (d) by all above methods Ans: d

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Engineering Multiple choice Questions and Answers

Engineering Multiple Choice Questions and Answers

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23 THOUGHTS ON “100 TOP MOST MAGNETISM AND AND ELECTROMAGNET ELECTROMAGNETISM ISM – ELECTRICAL ELECTRICAL ENGINEERING MULTIPLE CHOICE QUESTIONS AND AND ANSWERS ANSWERS” Digvijay NOVEM NOVE MBE BER R 27 , 201 6 AT 4 :15 AM

Plz send the pdf formt of all questions REPLY

Athong Ath ong NOVEMBER NOVEM BER 8, 2 01 6 AT 9 :39 PM

Sir could you please send me the complete syllabus of electrical engineering. Thank you REPLY

Guru prasad SEPTEM SEP TEMBE BER R 9, 2 01 6 AT 3 :41 AM

Sir please send me all electrical and electronics questions and answers,my mail id…[email protected] REPLY

amarhet AUGUST AUGUS T 1 4 , 2 01 6 AT 4 :3 5 PM

98-d


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REPLY

paramesh AUGUST AUGUS T 1 2 , 2 01 6 AT 8: 8:58 58 AM

hii..sir plz send all PDF files to mail I’d REPLY

kiran JUL JU LY 26, 2 016 AT 1:1 6 PM

24-D REPLY

kiran JULY JUL Y 26, 2 01 6 AT 1 0:08 AM

Pls send PDF mail to kirankumar496@gmail. Com REPLY

Pappu JUNE JU NE 17 , 201 6 AT 6:48 PM

Please sir send me pdf files REPLY

manindra JUNE JU NE 11 , 2016 AT 3:26 AM

I want descriptive solution of question no44,48,49,26,9,41,79


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Pls sir REPLY

Ismaila saka MAY 29, 2 016 AT 1:28 PM

Please can I have pdf on this email [email protected] REPLY

liki debata MAY 10, 2 016 AT 2:35 PM PM

Could u pls send me the pdf copy REPLY

Adity a kumar kum ar MAY 8, 201 6 AT 8:23 PM

Please send me pdf file objective electrical question REPLY

Louis Fanuel MAY 2, 201 6 AT 9:17 PM

please send a PDF format to [email protected] REPLY

E Tayof http http:/ ://e /engin ngine eeringint eringinte ervie rview wquest questio ion ns.co s.com m/ma /magnetis gnetism m-and-e -and-ele lect ctro rom magnet agnetism ism-e -elec lectric trical al-en -engine gineeri ering-m ng-mul ultip tiple le-ch -choic oice-qu e-ques estio tion ns-an s-and-answ -answe ers/

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APRIL 2 2 , 2 01 6 A T 6 :50 PM

Could you send these to me please? Thanks Tha nks REPLY

yame y ame APRIL 2 1 , 2 01 6 AT 1 0:3 9 AM

sir can i have a pdf copy of this file REPLY

Rajat Bobade APRIL 1 3 , 2 01 6 AT 3 :53 AM

Please sir provide Pdf Pdf of these mcq. On my email id [email protected] REPLY

Pijush Dutta APRIL 3 , 2 01 6 AT 5:5 7 PM

plz can you send me the pdf file of question & ans. REPLY

 engineer APRIL 3 , 2 01 6 AT 5:5 9 PM

ok Pijush Dutta i will will send you REPLY


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krish MAR ARCH CH 31 , 201 6 AT 5:30 AM

can u plz send these questions in pdf please REPLY

 engineer MAR ARCH CH 31 , 201 6 AT 1 1:49 AM

ok krish i will send you….. REPLY

Parmod kumar MAR ARCH CH 1 9, 2 01 6 AT 5:32 PM

Sir plz send me all electrical & electronics objective questions & answers pdf file. REPLY

harsha FEBR FE BRUAR UARY Y 20 , 2 01 6 A T 4:50 PM

ple REPLY

 engineer FEBR FE BRUAR UARY Y 25, 2 01 6 AT 8:3 9 AM

Ok i will will send you Questions and answers REPLY


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100 TOP MOST MAGNETISM and ELECTROMAGNETISM - Electrical Engineering Multiple choice Questions and Answers Electrical Engineering Multiple Choice Questions.pdf

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