Unformatted text preview: is? National Institute of Technology, Rourkela - 769008
Mid— Semester Examination, 2009
Session: 2008-09 Semester B. Tech: 8‘11 Semester
Subject: SOFC Technology (CR-436) Department Code: Ceramic Engineering
Full Marks: 60 marks Duration of Examination: 2 Hours Answer all Questions
Figures at the right hand margin indicate marks
All parts of a question should be answered to the point at one place
Marks a) Explain why Fuel Cell technology is gaining ground as alternative energy source. 4+5+3+
b) What are the basic requirements for different component of Ceramic Fuel Cell? “3+3
0) Deﬁne thermodynamic efﬁciency, Voltage efﬁciency and current efﬁciency of a
fuel cell? (1) Explain voltage efﬁciency by considering different kind of polarization observed in SOFC.
c) Find out the power/current relation for a SOFC. a) Draw the variation of defect concentration as a function of oxygen partial 20+4+6
pressure for C210 doped ZrOz system. Use electroneutrality condition and relation of different defect concentration with oxygen partial pressure. b) How will you prepare YSZ ﬁne particle by hydrolysis method from commercial source of zirconia? 0) Discuss the effect of different rare earth dopant on the conductivity of stabilized zirconia. ...
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