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Pune University - SY BSc (Sem - I) ELECTRONIC SCIENCE - II, April 2010

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Total No. of Questions : 4] P281 [Total No. of Pages : 2 [3717] - 124 S.Y. B.Sc. ELECTRONIC SCIENCE EL - 212 : Electronic Instrumentation (Semester - I) (Paper - II) (New Course) Time : 2 Hours] [Max. Marks : 40 Instructions to the candidates : 1) All questions are compulsory. 2) Draw the neat diagrams wherever necessary. 3) Figures to the right indicate full marks. 4) Use of nonprogrammable calculator is allowed. Q1) Attempt all of the following: a) State the unit of Lux. [1] b) Define accuracy of a measuring instrument. [1] c) Distinguish between fundamental and derive units. [1] d) What will be vms value if amplitude of a sine wave is 1 volt. [1] e) The expected value of current through a 100 resistor is 80 mA. The meter reads 78 mA. Calculate absolute and percentage error. [2] f) A moving coil voltmeter has a linear scale with 100 divisions. The fuel scale reading is 10 volt. Determine the resolution. [2] g) Input resistance of voltmeter should be very low . Comment. [2] h) Battery is the key factor in UPS - Comment. [2] Q2) Attempt any two of the following: a) Explain with the neat diagram the working of true rms meter. [4] b) Explain the sensor action of LDR in the detection of light in Lux-meter.[4] c) What is meant by regulation in power supply. State the expression for percent load Regulation. [4] P.T.O.

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Additional Info : S.Y. B.Sc. Electronic Science (Semister - I), EL - 212 : Electronic Instrumentation (Paper - II) (New Course), Pune University
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