9) Characteristics of four different permanent magnet materials are shown in the
ID: 2292880 • Letter: 9
Question
9) Characteristics of four different permanent magnet materials are shown in the below figure Everything else being similar, what magnet material can better resist against demagnetization? a) Alnico S 15 b) Ceramic 7 10 09 ()? c) Samarium cobalt Neodymium iron boron d) Neodymium-iron-boron 0.4 0.a 0 Samarium cobalt Ccramic 7 000 900 -800-700 0o -500 -400 300 200 -100 H. kA/m 10) F or the characteristics of the previous question, what magnet material could create the largest magnetic field? a) Alnico 5 b) Ceramic 7 c) Samarium cobalt d) Neodymium-iron-boron 11) In a DC machine, the current polarity of the conductor that undergoes commutation rapidly, resulting in large di/dt. This phenomenon is called a) Shift of neutral plane b) Flux weakening c) Inductive kick d) Run-outExplanation / Answer
9. d) Neodymium iron boron because it has the highest coercivity(from graph).
10. d) Neodymium iron boron because it has highest remanence.
11. c)Inductive kick
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