GATE for Instrumentation

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Transducer: Signal Conditioning Circuit

Transducer: Signal Conditioning Circuit Table Transducer Book Sr. No Transducer Signal Condition Circuit 1 Strain Gauge DC Bridge (Wheatstone bridge) 2 LVDT (Linear Variable Differential Transformer) Phase Sensitive Detector 3 RTD DC Bridge (Wheatstone bridge) 4 Piezoelectric Transducer Charge Amplifier 5 Thermocouple Cold Junction Compensation 6 Capacitance Transducer Push-Pull configuration, Capacitance Amplifier 7 PH Transducer Amplifier with High Input Impedance 8 LDR (light Dependence Resistance) Amplifier 9 Thermistor Bridge amplifier

Sensors and Industrial Instrumentation NPTEL Lectuers

1. Temperature Measurement https://youtu.be/As5kzxkyT24 http://nptel.ac.in/courses/108105063/4 https://youtu.be/5_MpULxwijg https://youtu.be/8nVnsKNR6dI https://youtu.be/85gm5aqeY44 https://youtu.be/ksJYAt9YupY 2. Pressure, Force and Torque Sensors https://youtu.be/0MP_9n08urA4 http://nptel.ac.in/courses/108105063/5 https://youtu.be/ydyVsVk96z8 https://youtu.be/9VpimWrPTaM https://youtu.be/RARjXXaFEQ0 3. Flow Measurement https://youtu.be/gByrUkZUnKo http://nptel.ac.in/courses/108105063/7 4. Level, Humidity, Viscosity and pH Measurement http://nptel.ac.in/courses/108105063/8 https://youtu.be/aM6ASRHwh8k 5.Strain Gauge https://youtu.be/lUjBmV4wMtA 6. LVDT https://youtu.be/g5OOzVcgfUQ 7. Capacitance Transducers https://youtu.be/f6miNLVGTqU 8. Piezoelectric Transducers https://youtu.be/QaNDC44ADHY

Transducer: piezoelectric transducer

Piezoelectric Sensor Piezoelectric Transducer It is example of active and passive transducer. Piezo-electric effect Direct Effect: generating an electric charge when subjecting it to a strain Indirect Effect: Generating a mechanical strain in response to an applied electric field Piezoelectric Material: Natural : Tourmaline; Quartz; Topaz; Rochelle salt Synthetic: Barium Titanate (BaTiO 3 ); Lead Zirconate (PbZio 3 ); Polymer Films (Polyvinylidene fluoride (PVDF), (-CH2-CF2-)n). Applications: Mechanical variables such as pressure, force and acceleration. Gas Lighters Quartz clocks Loudspeaker Signal Conditioning Circuit: Charge Amplifier Formula for piezoelectric transducer

GATE 2018 Paper Solution

Why do we need previous years papers? (GATE 2019 including GATE 2018 paper) Give detail idea about different topics Check your knowledge on particular topic Give confidence about your preparation See previous years paper before starting of preparation (Bird view) Solve previous years paper after preparation Any difficulty, refer theory Good paper solution Made Easy / ACE Hyd Volume 1 . / Volume 2

GATE 2018 Announcement

GATE 2018 Important Dates GATE 2018 Syllabus Instrumentation

Transducer List (useful for Match the following)

Sr. No Variable Sensor Remark 1 Temperature RTD(Resistance Temperature detector / Resistance Thermometer As temp. increase resistance increase. (mostly linear) Thermocouple (Two metals connected together) Active Transducer, generate voltage depends on temp. difference and material used. Thermistor NTC (Negative temperature coefficient), As temp. increase resistance decrease. Non linear Pyrometer Used for high temperature measurement LM 35 (Semiconductor IC) Most linear Temp. sensor Bimetallic Thermometer Two metal connected with different temperature coefficient 2 Flow Variable area flow meter ( rotameter ) Linear Scale, Float position change with flow, Q α h