Scientific Equipment & Services 358/1, New Adarsh Nagar, Roorkee - 247 667, UA, INDIA Ph. Ans. Summarise your thesis/research in 3 minutes. Input unit, memory unit, arithmetic and logic unit, output unit and control unit. Download our four probe experiment viva questions eBooks for free and learn more about four probe experiment viva questions. 2. Microwave Lab Viva Questions With Answers Familiarization of microwave components. A pure semiconductor completely free from impurities is called intrinsic semiconductor. THEORY: In figure four probes are spaced S1, S2, S3 and S4 apart. 46. Viva Questions Mar 16, 2017 Mar 16, 2017 Manas Sharma The following are some of the frequently asked questions for Viva of the Four Probe Experiment, … 31. Ge single crystal (n type with thickness (w) = 0.05 cm. What are the types of computer? CAO LAB VIVA Questions with Answers :-1. 39. … RESISTIVITY OF SEMICONDUCTORS BY FOUR PROBE METHOD AT DIFFERENT TEMPERATURES Manufactured by . The classic starter question to summarise your research. About the Author. 47. 1. Q.3. 37. VIVA VOCE QUESTIONS - SEMICONDUCTORS Q.1.What is a semiconductor ? 36. 41. What is meant by intrinsic semiconductor ? These books contain exercises and … 33. The four metal tips are part of an auto-mechanical stage which travels up and down during measurements. 43. 32. 3. In four probe method, do we 'have' to mearure the potential drop between the center 2 terminals, or, could we swap the functions of the probes... Also, can we, (theoreticaly), alter the distances between the probes which measure voltage, instead of all the probes … 29. 34. Previous Next Post . 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. What are the functional units of a computer? 42. . 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. Physics Lab Viva Questions. Each tip is supported by springs on the other end to minimize sample damage during probing. 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!. Personal computer, notebook computer, workstations, enterprise or mainframes. 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. Next Prev Post. The four points probe, as depicted schematically in fig.1, contains four thin collinear probes are made to contact the sample under test. 44. 1. ), four probe arrangement [distance between probes (S) = 0.2 cm. 45. Objective: To determination of the band-gap of the semiconductor using the four probe method. ... of undesired frequency or amplitude changes in the source itself as a result of interaction of oscillator or probe. The reason using four probes instead of two by having force and sense probes is to eliminate contact resistance and increase accuracy. Four point probe method is used straightly for resistivity measurement. It is a substance with conduction properties between metals and insulators. 30. Ans. Q.2. : +91-1332-272852, 277118 Fax: +91-1332-274831 Email: ses@sestechno.com 35. 40. 38. ], oven and thermometer. The 4-point probe setup used in the EECS 143 instructional lab consists of four equally spaced tungsten metal tips with finite radius. Changes in the source itself as a result of interaction of oscillator or probe four metal are. As a result of interaction of oscillator or probe tip is supported by springs on the other end minimize. 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