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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-IV (NEW) EXAMINATION - WINTER 2018
Subject Code: 2141704 Date: 01/12/2018
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Subject Name: Measurement & Instruments
Time: 02:30 PM TO 05:00 PM Total Marks: 70
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Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| MARKS | ||
| Q.1 | (a) Explain Lissajous pattern in oscilloscope in short. | 03 |
| (b) Differentiate indicating and recording instruments with examples. | 04 | |
| (c) Explain loading effect and their elimination in AC and DC meters. | 07 | |
| Q.2 | (a) How to minimize the possible errors in measurement of unknown resistance using Voltmeter-Ammeter method? | 03 |
| (b) Explain the PMMC with neat block diagram. | 04 | |
| (c) Explain Vector voltmeter with block diagram. | 07 | |
| OR | ||
| (c) Explain Digital storage oscilloscopes with neat block diagram. | 07 | |
| Q.3 | (a) What is harmonic? Explain the importance of harmonic analysis. | 03 |
| (b) Explain the frequency measurement using necessary diagram. | 04 | |
| (c) A moving coil ammeter has a fixed shunt of 0.02O, with a coil resistance of R=1000O and a potential difference of 500mV across it, full scale deflection is obtained. Calculate, --- Content provided by FirstRanker.com --- (a) The shunt current(b) Current through the meter coil: to give FSD (c) The meter coil resistance R to give full scale deflection when shunted current is 10A. | 07 | |
| OR | ||
| Q.3 | (a) Explain power measurement in DC circuit. | 03 |
| (b) Explain dual beam oscilloscope in short. | 04 | |
| (c) Explain the 3-phase power measurement using 2 watt-meter method with necessary diagrams. | 07 | |
| Q.4 | (a) Derive equation for Wheatstone Bridge. | 03 |
| (b) Explain 7 segment display in short. | 04 | |
| (c) Enlist different probes of oscilloscope, explain any two. | 07 | |
| OR | ||
| Q.4 | (a) Explain conductive coupling interference in short. | 03 |
| (b) Explain Sweep Frequency generators in short. | 04 | |
| (c) A Maxwell’s capacitance bridge shown in figure 1 (page 2) is used to measure an unknown inductance. The various values at balance are, R3=400O, R4=600O, R1=1000O, C1=0.5uF. Calculate the values of Rx and Lx. Also calculate the storage factor Q of coil if frequency is 1000 Hz. | 07 | |
| Q.5 | (a) Explain elimination of capacitance interference in short. | 03 |
| (c) Enlist different bridge circuits for inductance measurement. Explain Anderson Bridge with necessary diagram. | 07 | |
| OR | ||
| Q.5 | (a) Explain speed measurement in short. | 03 |
| (b) Explain power factor measurement using analog meter. | 04 | |
| (c) Explain the Current transformer with necessary diagram, also discuss its applications. | 07 | |
| Q-4 | (C) (OR) Figure 1 |
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