A alnico alloys b aluminium c cast iron d wrought

This preview shows page 3 - 6 out of 10 pages.

(a) alnico alloys (b) aluminium (c) cast iron (d) wrought iron Ans: a 8. Energy stored by a coil is doubled when its current is increased by percent. (a) 25 (b) 50 (c)41.4 (d) 100 Ans: c 9. Those magnetic materials are best suited for making armature and transformer cores which have____permeability and_______hystersis loss. (a) high, high (b) low, high (c) high, low (d) low, low Ans: c 10. The rate of rise of current through an inductive coil is maximum (a) at 63.2% of its maximum steady value (b) at the start of the current flow (c) after one time constant (d) near the final maximum value of current Ans: b 11. When both the inductance and resistance of a coil are doubled the value of (a) time constant remains unchanged (b) initial rate of rise of current is doubled (c) final steady current is doubled (d) time constant is halved Ans: a Surya Sasmal on 600 TOP MECHANICAL ENGINEERING Interview Questions and Answers PDF Zigam Abedin on [LATEST] ECE Questions and Answers Pdf free Download karni.seshagiri on 300 TOP Mechanical Engineering LAB VIVA Questions and Answers karni.seshagiri on 60 TOP MOST THERMAL Engineering VIVA Questions and Answers karni.seshagiri on 300 TOP Mechanical Engineering LAB VIVA Questions and Answers
Image of page 3

Subscribe to view the full document.

2/5/2018 50 TOP MAGNETIC CIRCUIT Multiple Choice Questions and Answers Pdf 4/10 12. The initial rate of rise of current through a coil of inductance 10 H when suddenly connected to a D.C. supply of 200 V is_______Vs (a) 50 (b) 20 (c) 0.05 (d) 500 Ans: b 13. A material for good magnetic memory should have (a) low hysteresis loss (b) high permeability (c) low retentivity (d) high retentivity Ans: d 14. Conductivity is analogous to (a) retentivity (b) resistivity (c) permeability (d) inductance Ans: c 15. In a magnetic material hysteresis loss takes place primarily due to (a) rapid reversals of its magnetisation (b) flux density lagging behind magnetising force (c) molecular friction (d) it high retentivity Ans: d 16. Those materials are well suited for making permanent magnets which have _____ retentivity and _______ coercivity. (a) low, high (b) high, high (c) high, low (d) low, low Ans: b
Image of page 4
2/5/2018 50 TOP MAGNETIC CIRCUIT Multiple Choice Questions and Answers Pdf 5/10 17. If the area of hysteresis loop of a material is large, the
Image of page 5

Subscribe to view the full document.

Image of page 6
  • Fall '18
  • rtghrtgh
  • Magnetic Field, Engineering Multiple choice, CIRCUIT Multiple Choice

{[ snackBarMessage ]}

Get FREE access by uploading your study materials

Upload your study materials now and get free access to over 25 million documents.

Upload now for FREE access Or pay now for instant access
Christopher Reinemann
"Before using Course Hero my grade was at 78%. By the end of the semester my grade was at 90%. I could not have done it without all the class material I found."
— Christopher R., University of Rhode Island '15, Course Hero Intern

Ask a question for free

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern