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