RESISTIVITY OF SEMICONDUCTORS BY FOUR PROBE METHOD AT DIFFERENT TEMPERATURES Manufactured by . 40. It is a substance with conduction properties between metals and insulators. Physics Lab Viva Questions. : +91-1332-272852, 277118 Fax: +91-1332-274831 Email: ses@sestechno.com The 4-point probe setup used in the EECS 143 instructional lab consists of four equally spaced tungsten metal tips with finite radius. VIVA VOCE QUESTIONS - SEMICONDUCTORS Q.1.What is a semiconductor ? THEORY: In figure four probes are spaced S1, S2, S3 and S4 apart. 43. So, here are more than 7 questions you can prepare for in advance of your PhD viva: You can now check out this post too for 67 practice viva questions!. . Current I am made to flow between to outer probes, and voltage Vis measured between the outer probes and voltage V is measured between the two inner probes, ideally without drawing any current. 45. These books contain exercises and … Four point probe method is used straightly for resistivity measurement. Theory: In a crystalline solid as a result of interaction between tremendous numbers of atoms in the crystal the energy levels are split up and form bands of allowed energy which contains almost continuum of levels. 46. 44. What is meant by intrinsic semiconductor ? 3. ], oven and thermometer. Q.3. 30. 34. ), four probe arrangement [distance between probes (S) = 0.2 cm. Download our four probe experiment viva questions eBooks for free and learn more about four probe experiment viva questions. Scientific Equipment & Services 358/1, New Adarsh Nagar, Roorkee - 247 667, UA, INDIA Ph. Input unit, memory unit, arithmetic and logic unit, output unit and control unit. 1. Viva Questions. The reason using four probes instead of two by having force and sense probes is to eliminate contact resistance and increase accuracy. 38. Ans. … Ge single crystal (n type with thickness (w) = 0.05 cm. Microwave Lab Viva Questions With Answers Familiarization of microwave components. Summarise your thesis/research in 3 minutes. ... of undesired frequency or amplitude changes in the source itself as a result of interaction of oscillator or probe. Personal computer, notebook computer, workstations, enterprise or mainframes. 32. What are the types of computer? The classic starter question to summarise your research. 37. 33. 31. 47. Previous Next Post . Q.2. Next Prev Post. 2. 41. Objective: To determination of the band-gap of the semiconductor using the four probe method. 29. The four points probe, as depicted schematically in fig.1, contains four thin collinear probes are made to contact the sample under test. 42. CAO LAB VIVA Questions with Answers :-1. 39. Current I is passed through the outer probes (1 & 4) and the floating potential V is measured approx the inner pairs of probes 2 & 3. Ans. 35. 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