GATE for Instrumentation

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

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 

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 Important Dates GATE 2018 Syllabus Instrumentation

   1. Passive Transducer:  No generation of voltage Eg. , Strain Gauge, RTD  (Resistance Temperature Detector),  Resistance Hygrometer, Thermistor,   Piezoelectric Transducer,  etc.  2. Active Transducer: Generation of voltage/current E.g.  Thermocouple, Piezoelectric Transducer, Photo-volatile Cell, Tachogenerator  3. Analog Transducer  E.g., Strain Gauge, LVDT, Thermocouple, Thermistor 4. Digital Transducer E.g.,  Tu rbine meter used in for flow measurement 5. Transducer (converts a non-electrical quantity into an electrical quantity) Eg. LVDT (mechanical displacement to electrical), Thermocouple (Temp to voltage) 6. Inverse Transducer (an electrical quantity into a non-electrical quantity) E.g., Piezoelectric crystals  7. Primary and secondary Transducer  E.g. For pressure measurement, a bourden tube is used, which is used to convert pressure to displacement. After, LVDT ...