Electronic Instrumentation (INDSC2C) — DU B.Sc. (Hons) Instrumentation Previous Year Question Papers

Electronic Instrumentation (Core) B.Sc. Instrumentation (NEP UGCF Mode) 2. Attempt five questions in all. Q.1 (a) I(b) What is loading effect observed in voltmeter? How can it be resolved? (3) In a Q meter, selfcapacitance of a coil is measured. The first measurement (3) is at fi=4hffl and the value of capacitance Ci=800pF. The second •measurementisatf2=8hAlzandthevalueofcapacitanceC2=300pF.Find (c) (d) (e) (I) the value of di stributed capacitance. Draw the block diagram of Random Noise Generator. Calculate the value ofRsh for an ammeter with 5mA meter movement and internal resistance of 400Q. The range of the ammeter is 0-250mA. Draw the circuit for the design?d ammeter. In a balanced wheatstone Bridge, the resistances in three arms are given as Ri = 5 kQ, R2 = 10 k£2, and R3 = 30 kQ. Detemine the value of the unknown resistance Rx in the fourth arm. Draw one Lissajous pattern obtained when a 6 kHz frequency signal is connected to vertical (fy) and 2 ldlz frequency signal (fx) is connected to the horizontal section of a CRO. (3) Q.2 (a) Explaintheworking of Dual slopeintegratingtypeDVMwiththe help (7) of block diagram. (b) Explain the working of AC voltmeterwith full wave rechfier. Also derive (7) the formulae for multiplier resistance Rs for the AC voltmeter with full wave rectifier. (c) A Schering bridge is used to measure a capacitive impedance. The bridge (4) constants at balance are Ci=0.4HF, Ri=5k£2, R2=10k£2, C3=0.6LF and f=2kllz. Find the series equivalent of the unknown impedance and dissipation factor. Q.3 (a) Explain the working of gate control flip flop used in measurement of (7) frequency in basic circuit of digital frequency meter. (b) Explain the working of square wave generator using block diagram. (7) (c) What is gating error in universal counter? Calculate the crossover (4) frequency of the universal counter if crystal frequency of the instrument is 64RE. Q.4 (a) Derive the formulae for deflection sensitivity (S) of a CRT. (7) (b) What is the application of a Sampling Oscilloscope? Describe its (7) operation with help of a block diagram. (c) Explain the working of vertical deflection system of a CRO with help of (4) a block diagram. and large capacitors. (b) What is a spectrum Analyzer? Explain its operation with help of a block (7) (c) Explain the working of a basic wave analyzer. (4) Q.6 (a) (b) (C) Design an Aryton shuntto provide an Dc ammeterwith current ranges of 0-2mA, 10mA and 20mA, using D'Arsonval movement having internal resistance of 60Q and full-scale current of 200LiA. Which parameter is measured using wein's Bridge? Draw its circuit and derive the formulae for the unknown parameter. A 3 i digital voltmeter is used for voltage measurement (i) Find its resolution. (ii) How would 0.6589 be displayed on lv and 10V range? it is achieved in CRO? a) What is the basic working principle of Harmonic Distortion Analyzer? (7) Explain any one method to design a Harmonic Distortion Analyzer.