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