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