GTU BE/B.Tech 2018 Winter Question Papers || Gujarat Technological University
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GUJARAT TECHNOLOGICAL UNIVERSITY
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BE - SEMESTER-1V (NEW) EXAMINATION - WINTER 2018
Subject Code:2141003
Subject Name:Electronics Measurement and Instrumentation
Time: 02:30 PM TO 05:00 PM
Date:01/12/2018
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Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| Q.1 | (a) | Fill in the blanks | 14 |
| The repeat accuracy of an instrument can be judged from its ______ of error. | |||
| A ______ device prevents the oscillation of the moving system and enables the latter to reach its final position quickly. | |||
| A ______ is a passive transducer and is employed for converting mechanical displacement into a change of resistance. | |||
| LVDT windings are wound on ______ material. | |||
| A permanent magnet moving coil instrument can be used as ______ using a low resistance shunt. | |||
| A null type of bridge with DC excitation is commonly known as ______ bridge. | |||
| Storage oscilloscope operates on ______ principle. | |||
| To avoid the effect of ______ in AC bridges we can use magnetic screening. | |||
| To measure the flux, devices used are based on ______ effect. | |||
| A spectrum analyzer is used to measure ______. | |||
| ______ shape signals are generated by Wien-bridge oscillators. | |||
| Most suitable material for a thermocouple is ______. | |||
| Focusing and accelerating anodes are of ______ shape. | |||
| ______ technique is most widely used in the single channel data acquisition system. | |||
| Q.2 | (a) | Define: (1) Sensitivity; (2) Reproducibility, (3) Repeatability. | 03 |
| (b) | Give the difference between Systematic error and Random error. | 04 | |
| (c) | What are the difficulties associated with low resistance measurement? | 07 | |
| Q.3 | (a) | Explain working principle of Kelvin’s double bridge. | 07 |
| OR | |||
| (b) | Elaborate the Maxwell’s induction-capacitance bridge and give its advantages and disadvantages. | 07 | |
| Q.3 | (a) | What is deflection defocusing and its causes? | 03 |
| (b) | Why phosphor screen is provided with an aluminum layer in Cathode Ray Tube? | 04 | |
| (c) | Explain Digital frequency meter. | 07 | |
| OR | |||
| (a) | Define: (1) gating error, (2) time base error, (3) trigger level error. | 03 | |
| (b) | Explain constant current mode and constant voltage mode with respect to Vector impedance meter. | 04 | |
| (c) | Draw and explain neat schematic diagram of Cathode Ray Tube. | 07 | |
| Q.4 | (a) | Give applications of Wave analyzer. | 03 |
| (b) | Compare standard signal generator with modern signal generator. | 04 | |
| (c) | Explain Resistance Temperature Detector and its lead compensation method. | 07 | |
| Q.4 | (a) | Write advantages of Wien Bridge Oscillator. | 03 |
| (b) | Explain the two types of delay line in CRO. | 04 | |
| (c) | Explain the sweep frequency generator. | 07 | |
| Q.5 | (a) | What are the piezoresistive and piezoelectric effects? | 03 |
| (b) | What is Lock-in amplifier? | 04 | |
| (c) | Elaborate Hall-effect transducer. | 07 | |
| OR | |||
| Q.5 | (a) | Note the importance any three components of Digital Acquisition System. | 03 |
| (b) | What are the advantages of opto-couplers? | 04 | |
| (c) | Explain principle, operation, working, applications of LVDT. | 07 |
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