GTU BE 6th Semester 2163906 Nanomagnetism and NanoFluids Summer 2018 Question Paper

Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE – SEMESTER ?VI (NEW) – EXAMINATION ? SUMMER 2018
Subject Code:2163906 Date:10/05/2018
Subject Name:Nanomagnetism and NanoFluids
Time:10:30 AM to 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Q.1 (a) What are magnetic materials? Define types of magnetic materials 03
(b) Give comparison between ferromagnetic materials and ferromagnetic
materials.
04
(c) Explain any four types of magnetic materials on the base of magnetization. 07

Q.2 (a) What is nonlinear magnetic behavior? Give its example. 03
(b) Explain magnetic hysteresis loop with neat sketch 04
(c) Explain temperature effect on magnetization and susceptibility. 07
OR
(c) Explain nano scale effect on properties of magnetic materials. 07
Q.3 (a) Define nano magnet with examples. 03
(b) What is fluid? Explain magnetic fluid. 04
(c) Explain B-H loop of magnetic materials 07
OR
Q.3 (a) Define ferrofluid with their examples. 03
(b) Explain properties of ferrofluid. 04
(c) Explain sintering temperature effect on properties of nano magnets. 07
Q.4 (a) Define bottom up and top down approach to prepare nano fluid. 03
(b) Describe temperature effect on properties of nano fluid. 04
(c) Write short note on application of nano fluid. 07
OR
Q.4 (a) Define stability of nano fluid. 03
(b) Discuss magnetization of nano fluid 04
(c) Explain sol ?gel technique to synthesize nano fluid. 07
Q.5 (a) What is electro discharge technique? 03
(b) Explain Electro discharge technique to prepare nano fluid. 04
(c) Explain smart cooling nano fluid and write their applications. 07
OR
Q.5 (a) What is step one technique to prepare nano fluid? 03
(b) Explain stability of nano fluid. 04
(c) Describe applications of magnetic materials as memory storage device. 07
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