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Biomedical Instrumentation MCQs – Oximeters

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1. The narrow beam transducer is very sensitive and produces a good trigger signal for instantaneous heart rate determination.




2. Which of the following transducer is used to detect foetal heart movements over a wider area?




3. Which transducer is arranged in the shape of a clover leaf so that it provides a large area of illumination?




4. The array transducer housing is flexible to permit it to follow the contour of the abdomen regardless of shape changes with contractions.




5. At what angle divergent beam is transmitted by a crystal in array transducer?




6. The transmitting crystal emits 40° divergent beam so that the beam covers an area of approximately _____ cm diameter.




7. What is the diameter of an array transducer?




8. The array transducer can be held in place by a simple buckle.




9. Which module consists of a pair of Perspex plates?




10. In the sampling unit, when it is in its earlier form consisted of a circular turntable carrying around its rim 40 disposable __________ of 2 ml capacity.




11. What is the ratio of the sampling time to wash time?




12. Which of the following is not the part of the manifold?




13. Which of the following is not the type of tubing?




14. There are two types of coils employed in the system, which are ____




15. In phasing, if the cholesterol stream arrives at Y time, albumin must arrive at ______




16. Which coils are used to permit the channels to enter the calorimeter in the proper sequence?




17. _____ is non-invasive method allowing the monitoring of the saturation of a patient’s hemoglobin.




18. A = log I0/I,where I0 is_____




19. A = ɛDC, where ɛ is _______




20. A pulse oximeter shows the percentage of venous hemoglobin in the oxyhemoglobin (HbO2) and hemoglobin (Hb).




21. What is used as a photodetector in pulse oximetry?




22. What is the wavelength of the red LED in pulse oximetry?




23. What is the wavelength of infrared LED in pulse oximetry?




24. A pulse oximeter is useful in any setting where a patients oxygenation is unstable.




25. Portable pulse oximeters are useful for ______ whose oxygen levels may decrease at high altitude.




26. ______ is very useful for patients having respiratory or cardiac problems because of their simplicity of use and the ability to provide continuous and immediate oxygen saturation levels.




27. What is intrauterine pressure during the expulsion period?




28. What is the interval of uterine contractions in a normal patient in spontaneous active labour?




29. What is the duration of uterine contractions in a normal patient in spontaneous active labour?




30. The toco-transducers are temperature sensitive.




31. What is the peak intensity of uterine contractions in a normal patient in spontaneous active labour?




32. What are labour-activity transducers?




33. What is used to convert the movement of transducer due to an increase of tension in uterus into an electric signal?




34. The narrow beam transducer permits the operator to position the baseline on the zero-level line of recording chart.




35. In external toco-tonometry, movement of _____ may be superimposed on labour activity.




36. What is measured in the internal method using fluid-filled catheter?




37. What is the range of Instantaneous beat to beat rate digitally displayed?




38. A _______ channel chart recorder is incorporated in instruments used for monitoring labour activity.




39. What is the standard chart speed?




40. In two-channel chart recorder, FHR is recorded on a calibrated chart in ________




41. Uterine contractions are calibrated in range of ______ in two-channel chart recorder.




42. The instrument which carries out a continuous and simultaneous recording of the instantaneous foetal heart rate and labour activity is called _________




43. ________ is not an indirect method of foetal heart rate in cordiotocography monitoring.




44. _______ is a direct technique of uterine contraction in cardiotocographic monitoring.




45. The galvanometer, which needs a frequency response of only 3 MHz, is positioned by a servo motor through a silent step-down belt drive.




46. The intrauterine pressure can reach values of 150 mmHg or more during the expulsion period.




47. Which transducer cannot be used in the same place as the foetal heart rate detector, thus the patient must have two transducers on her abdomen?




48. Which is the most important of all instrumental methods of analysis in clinical chemistry?




49. Which method of the following is based on the absorption of electromagnetic radiation in visible, ultraviolet and infrared ranges?




50. Where are the electrodes placed for recording foetal electrocardiogram?