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