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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. Q3) Attempt any two of the following: a) How D Arsonvol movement is converted into multirange ammeter. [4] b) Draw the circuit diagram of unregulated power supply and explain the working of each block. [4] c) Explain the working of Inductive pick-up tachometer. [4] Q4) Attempt any two of the following: a) With the help of block diagram explain the working of DC to DC converter. [6] b) Draw neat labeled diagram of dual beam CRO. c) i) How oscilloscope is used to measure phases. ii) How square wave is obtained in function generator. [6] [6] OR Attempt all of the following: a) Design 0 - 10V range voltmeter with D Arsonvol movement. Full scale deflection is 50 A and interval resistance of a coil is 500 . Find the value of series resistance. Draw the diagram. [4] b) For a signal generator 30 volt is output resistance value and 3 volt is in range value. Find the attenuation in dB. [4] c) i) For the CRO vertical amplifier control is set of 10mV/dR and peak to peak display is at 4 dB. Find the peak voltage of the signal. [2] ii) For a microvoltmeter the deflection is 10 division for 10 mV input. Find the sensitivity of its. [2] Y [3717] - 124 2

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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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