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2003 Course Biomedical Eng.

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Total No. of Questions : 12] P1614 [Total No. of Pages : 3 [3764]-235 B.E. (E & T/C) BIOMEDICAL ENGINEERING (404225) (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer 3 questions from Section-I and 3 questions from Section-II. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Assume suitable data, if necessary. SECTION - I Q1) a) Discuss 10 most important factors to be considered in the design of medical instrumentation. [8] b) State measurement range and frequency of following physiological parameters and sensors used in biomedical engineering. [8] i) Blood Flow ii) Arterial and Venous blood pressure iii) PO 2 iv) ECG OR Q2) a) What is use of isolation amplifier in biosignal amplification? Explain working of such amplifier with necessary diagram. [8] b) Explain optical fiber sensors for various measurements in bio medical. [8] P.T.O. Q3) a) Explain Einthoven triangle concept with necessary diagram. [8] b) Lead I amplitude is 4 mm. Lead III amplitude is 7 mm. What is Lead III amplitude? If sensitivity is 100 mm/mV, calculate aVR, aVL and aVF. [8] OR Q4) a) What are the different problems frequently encountered in the measurement of ECG? [8] b) What are the different protections provided in the ECG machine? [8] Q5) a) What are effects of electric current on the biological tissues? [8] b) Draw block diagram and explain essential features of central monitoring system for an critical care unit in the hospital. [10] OR Q6) a) What is Let go current? Explain macroshock and microshock hazards of electricity in medical instrumentation. [10] b) Explain operation of Lead Fault indicator in a bedside monitor. [8] SECTION - II Q7) a) What is the basic photometric technique used in bio-analytical instruments? [6] b) Draw and explain different components of an blood oxygen electrode. [6] c) State the chemical reaction between electrode and electrolyte in the measurement of PO2. [4] OR Q8) a) State the Beard-Lambards law that govern the operation of analytical instruments. [4] [3764]-235 -2- b) Why it is necessary to have a monochromatic light source in analytical instruments? [4] c) Explain different methods to generate monochromatic light source.[8] Q9) a) State the ideal specifications of an recorder to be used in medical instrumentation. [8] b) What is open circuit (No-load) voltage across the patient electrodes of a defibrillator using 16 F capacitor and charged to 200 w-s normally? [4] c) In the above example if patient resistance is of 500 and internal resistance of instrument is 20 , calculate the electrode voltage when discharge button is pressed. [4] OR Q10) a) Draw different types of EEG waveforms in normal resting brain condition. State their amplitude and frequency range. [8] b) State the normal counts of different blood cells present in men and women. [4] c) Explain the principle of blood cell counting in a Coulter blood cell counter. [4] Q11) a) Draw block diagram of image intensifier in a X-ray machine and explain its working. [6] b) Explain principle of Ultrasonic doppler effect measurements. [6] c) What is diabetic retiopathy? How it is cured with Laser? [6] OR Q12) a) Explain gradient generation in reference to MRI technique. Draw neat block diagram of MRI. Show the relation between RF Transmitter, receiver chain, gradient generation and coil drive unit. [16] b) Explain long forms of He-Ne Laser Nd-YAG Laser [2] rrr [3764]-235 -3-

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