GATE Sensors and Bioinstrumentation: Sensors and Signal Conditioning – Previous Year Questions
14 GATE previous year questions on Sensors and Signal Conditioning (Sensors and Bioinstrumentation, Biomedical Engineering) with answers and explanations, from every paper.
- GATE 2020 BM Q30 – An endoscope’s distal end is 1 mm from the gastrointestinal wall. Fibre core and cladding refractive indices are 1.5 and 1.45. Find maximum full…
- GATE 2020 BM Q31 – Two coils are wound separately on identical ring-shaped ferromagnetic cores. Coil 1 has N turns and wire gauge G, while coil 2 has 2N turns and gauge…
- GATE 2020 BM Q32 – Two dyes X,Y have concentration ratio cX/cY=0.25 and are measured in identical cuvettes. Their absorbance ratio AX/AY=0.5. Find the ratio of molar…
- GATE 2020 BM Q34 – An 830 nm laser-Doppler blood-flow probe is at 60° to the flow direction. Mean flow velocity is 3 cm/s. Find Doppler-shift magnitude in kHz to one…
- GATE 2021 BM Q19 – Which displacement sensor is known for high sensitivity and a relatively large measurement range?
- GATE 2021 BM Q20 – Which temperature sensor is used in contact-type digital thermometers for measuring body temperature?
- GATE 2022 BM Q53 – A wire material has linear temperature coefficient x×10⁻⁴ °C⁻¹. Its resistance is 50 Ω at 25°C and 60 Ω at 75°C. Find x to two decimals.
- GATE 2023 BM Q55 – A thermistor has resistance 1 kΩ at 25°C and 500 Ω at 50°C. Find its temperature coefficient of resistance at 35°C, in °C⁻¹ to three decimals.
- GATE 2023 BM Q62 – A metallic strain gauge has resistance 200 Ω, Young’s modulus 80 GPa and Poisson’s ratio 0.42. It experiences longitudinal strain 50×10⁻⁶. Neglect…
- GATE 2024 BM Q52 – A 15 ng/μL DNA solution in a 0.5 mm microcuvette has absorbance 0.24 at 260 nm. After concentration, absorbance is 0.38 at the same wavelength and…
- GATE 2024 BM Q63 – A 4 mV biopotential enters an amplifier with differential gain 2000. Common-mode input noise is 1000 mV and output noise 200 mV. Find CMRR in dB,…
- GATE 2025 BM Q30 – Which does NOT use piezoelectric transducers?
- GATE 2025 BM Q53 – A thermistor obeys R(T)=R 0[(1/T-1/T 0)], with β=3100 K. A resistance measurement has 10% relative error. Estimate relative error in measuring T=310…
- GATE 2026 BM Q57 – A 532 nm laser fully illuminates a photodiode in series with 10 kΩ. Responsivity at this wavelength is 0.5 A/W, voltage across the resistor is 10 mV,…