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