List of top Sensors and Bioinstrumentation Questions

Consider two cuboidal blocks of volume 1 cm\(^3\) each, one made of gold and the other of undoped silicon. What will happen to the resistivity of these blocks if the temperature is increased from 300 K to 350 K?
A Hall effect flow meter is used to measure the volumetric flow through a blood vessel. The system calculated the flow rate to be 100 cm\(^3\cdot\text{s}^{-1}\). Later, calibration revealed that (i) the voltmeter was reading 40% higher than actual, and (ii) the caliper was measuring the vessel diameter 10% smaller than actual. Assuming a uniform flow profile and ignoring viscosity, the actual blood flow is _________ cm\(^3\cdot\text{s}^{-1}\) (rounded off to two decimal places).
A catheter based arterial blood pressure measurement device uses a flexible diaphragm mounted with four identical strain gauges in a Wheatstone bridge configuration as shown in the figure. Assume that the strain gauges have a nominal resistance value of \(R_G = 10\ \text{k}\Omega\), Gauge Factor \(G = 40\) and Young’s Modulus \(E = 10\ \text{MPa}\). Blood pressure variations result in small finite change in strain \(\varepsilon (\varepsilon>0)\). If \(V_o\) is the output voltage of the Wheatstone bridge and \(\sigma\) is the stress in MPa, the sensitivity \[ \frac{V_o}{\sigma} \] is ________ V.MPa\(^{-1}\).
Which of the following statements related to biomedical measurements are TRUE?
The thickness of piezoelectric crystal (PZT5A) used in ultrasound applications will determine the resonant frequency of the transducer. To work at a resonance frequency of 5 MHz, the thickness of a PZT5A transducer must be ________ mm (rounded off to three decimal places).
Which of the following statements related to the safety of biomedical instruments are TRUE?
Which of the following statements related to the operating principle of pulse oximetry are CORRECT?