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sem - vii Instrumentation System (dec-07)(Electronics)
Posted Date: 19 Jan 2008 Resource Type: Articles/Knowledge Sharing Category: General
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Posted By: bhavik Member Level: Bronze
Rating:  Points: 5
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N.B. (1)Question No.1 is compulsory.
(2)Attempt any four questions out of remaining questions.
(3)Draw Neat technical Figures and Block diagrams & circuit diagrams.
1. (a)Explain the sample & hold amplifiers with block & circuit diagram,& timing diag. for sample state,sample to hold state,hold-state & hold to sample state.(5)
(b)Explain the 4-Op-Amp type instrumentation amplifier & compare it with 3-Op-Amp I.A. version.Derive the equation of gain for 4-Op-Amp type instrumentation amplifier.(5)
(c)Explain the operating principles of photo-conductive cell,photo-voltaic cell, & photo-emissive cells.Also state their application in industrial applications.(5)
(d)Explain the 3-wire & 4-wire,2-wire typr PT-100-temperature measurement probes/transducers.Also explain explain this comparisons.(5)
2. Explain the weather monitoring type Data aquisition system on the following guidelines (20)
- Types of weather parameters to be monitored
- Suitable sensors/tranducers for that weather parameters
- Analog/Digital Signal/Information processing module.
- Out-put module in the form of recording,storing & communicating methodology.
3. (a)Explain the need of isolators in analog digital ckts. Give the diff. (20)methods of Isolator used in signal processing/amplifications. Also state the comparison of 2-port,& 3-port isolation technology with functional diagrams.
(b) (1)Explain the seebede & peltier effects in the thermocouples type temperature measurements.
(2)Explain the 5-laws of thermo-couples types temperature transducers.
4. (a)Explain the following types of displacement transducers : (20)
- Incremental type for angular & linear displacements.
- Encoded type for angular & linear displacements.
Also explain how the DIRECTION & MAGNITUDE of DISPLACEMENT quantifier are generated for the user.
(b)Explain both types of ultrasonic type flow-measurement methods with constructional & mathematical & also the circuit/block diagram type technical support.
5. (a)Explain the binary-weigted & R-2R weighted type D/A convertors.Give (20)mathematical relationships between digital i/p & output analog value. Also compare qualities for D/A conversions.
(b)Explain the quad-integrating convertor type A/D. Convertor with following things:
- Timing diagram for all 4-phases
- Comparison with dual slop type A/D convertor
- block/ckt diagram for quad-slope A/D convertor.
6. (a)Define the following terms : (20)
- Gause pressure
- Absolute pressure
- Differential pressure
- Static pressure
- Velocity pressure
(b)Explain the following types of strain Gauges :
- Wire type
- Foil type
- Semi-conductor type
7. (a)Explain the diff methods of torque measurements.Give their (20)
constructional diagrams with working principles.
(b)What is LVDT & RVDT ? Explain what are the parameters those can be measured with this. Give their output characteristics with constructional details. Explain how direction & magnitude of displacement are monitored/measured.
8. (a)Explain the following types of proximity s/w (any two) :- (20)
- Ultrasonic-echo-type proximity s/w
- Inductive-proximity s/w
- Retro-Reflective optical proximity s/w.
Give the constructional diagram , electrical block/ckt diagram also give the connector pin , Specifications & on prx-switch adjustment controls.
(b)Explain the mechanical pressure transducers of following types.(any Two):-
- Bourdon-tubes
- Inductive differential pressure transducers
- Solid-state crystal type pressure transducers.
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