Quiznetik

Basic of Biomedical Instruments | Set 2

1. Which of the following cannot be treated as a requirement of the instrumentation amplifier?

Correct : B. Low input impedance

2. Amplifier with power supply and output circuits galvanically isolated are called

Correct : B. Isolation amplifier

3. Voltage follower is also known as

Correct : A. Unity gain amplifier

4. Which configuration of op-amp is used for filter circuit?

Correct : C. Inverting

5. Amplification of low level signal can be done using

Correct : A. Electrometer amplifier

6. For an ideal op-amp, zero input results in zero output.

Correct : A. True

7. Which of the following is not a requirement of transmission lines?

Correct : C. High power signal

8. What is used between the two lead wires of a parallel transmission line?

Correct : A. Plastic

9. What is used as a surrounding for the solid center core in a coaxial cable?

Correct : A. Plastic dielectric

10. For what purpose was twisted pair cable first used?

Correct : B. Telephone

11. What is the type of transmission line in which neither wire is connected to the ground?

Correct : D. Balanced line

12. What is the phase difference between the current flowing in the two wires of a balanced line?

Correct : B. 180°

13. In a balanced line, noise is present in the transmission line but cancels at the receiver.

Correct : A. True

14. What is it called when the noise is present in the transmission line but gets canceled at the receiver?

Correct : C. Common mode rejection

15. Coaxial cables are lines?

Correct : B. Unbalanced

16. What is the device that converts the balanced line to an unbalanced line called?

Correct : C. Balun

17. Which filter attenuates any frequency outside the pass band?

Correct : A. Band-pass filter

18. Narrow band-pass filters are defined as

Correct : C. Q > 10

19. Find the center frequency of wide band-pass filter

Correct : A. fc= √(fh ×fL)

20. Find out the voltage gain magnitude equation for the wide band-pass filter.

Correct : A. AFt×( f/fL)/√[(1+(f/fh)2]×[1+(f/fL)2].

21. When a second order high pass filter and second order low pass sections are cascaded, the resultant filter is a

Correct : B. ±40dB/decade band-pass filter

22. Find the voltage gain magnitude of the wide band-pass filter? Where total pass band gain is=6, input frequency = 750Hz, Low cut-off frequency =200Hz and high cut-off frequency=1khz.

Correct : D. c) 14.837dB

23. Compute the quality factor of the wide band-pass filter with high and low cut-off frequencies equal to 950Hz and 250Hz.

Correct : C. 0.696

24. The details of low pass filter sections are given as fh =10kHz, AF= 2 and f=1.2kHz. Find the voltage gain magnitude of first order wide band-pass filter, if the voltage gain magnitude of high pass filter section is 8.32dB.

Correct : C. 14.28dB

25. The quality factor of a wide band-pass filter can be

Correct : B. 9.1

26. If the gain at center frequency is 10, find the quality factor of narrow band-pass filter

Correct : C. 3

27. The advantage of narrow band-pass filter is

Correct : D. All of the mentioned

28. Which of the following is the technique of analyzing the electrical activity of the heart by obtaining ECG’s?

Correct : A. VCG

29. Vectorcardiogram displays the electrical events in perpendicular axes.

Correct : B. two

30. is a vectorial representation of the distribution of electric potentials generated by heart.

Correct : D. VCG

31. How many loops each vectorcardiogram exhibits?

Correct : C. three

32. Which of the following instrument is used for recording the sounds connected with the pumping action of the heart?

Correct : C. PCG

33. Which instrument is used for clinical detection of heart sounds?

Correct : A. Stethoscope

34. Who provides a recording of waveforms of heart sounds?

Correct : C. Phonocardiograph

35. What is the frequency range of sound generated from the closure of the mitral and tricuspid valve?

Correct : B. 30 to 100 Hz

36. Which of the following microphone is used for recording phonocardiograms?

Correct : A. Contact Microphone

37. What is the frequency range of sound produced at the closure of aortic and pulmonic valves?

Correct : D. above 100 Hz

38. What is the thickness of the new acoustic sensor?

Correct : C. 1.0 mm

39. Who described the new acoustic sensor?

Correct : D. Kassal et al

40. Acoustic sensor principal sensing component is made up of which polymer?

Correct : C. PVDF(Poly-vinylidene fluoride)

41. What is the frequency range of amplifier used for a phonocardiograph?

Correct : C. 20 to 2000 Hz

42. PCG amplifiers usually have gain compensation circuits to increase the amplification of high frequency signals, which are usually of low intensity.

Correct : A. True

43. Which of the following instrument is used for recording the electrical activity of the muscles?

Correct : B. EMG

44. EMG is recorded by using surface electrodes.

Correct : A. True

45. Whose measurements are important for myoelectric control of prosthetic devices?

Correct : D. EMG

46. What is used to display EMG waveforms?

Correct : A. Cathode Ray Oscilloscope

47. The amplitude of EMG signals depend upon which of the following factor?

Correct : B. Position of electrode

48. What is the typical range of EMG signals?

Correct : C. 0.1 to 0.5 mV

49. EMG instrument contain frequency component extending up to Khz.

Correct : C. 10

50. What is included in the system to facilitate playback and study of EMG sound waveforms at a later convenient time?

Correct : C. Tape Recorder

51. What is necessary for providing a common reference for measurement?

Correct : B. ground electrode

52. Which of the following interpreter can diagnose various muscular disorders by listening to the sounds produced when the muscle potentials are fed to loudspeaker?

Correct : D. EMG

53. What is the diameter of silver electrodes in the amplifier circuit of Johnson et al?

Correct : C. 6 mm

54. What should be CMRR of preamplifier upto 5 Khz?

Correct : D. greater than 90 dB

55. Modern EMG machines are PC based.

Correct : A. True

56. EMG instrument is useful for making study of

Correct : B. neuromuscular function

57. Which of the following instrument is used for making a study of reflex responses?

Correct : D. EMG

58. Blood pressure measurement can be classified in major way(s).

Correct : A. 2

59. The regular BP cuff is a non – invasive method of measuring blood pressure.

Correct : A. True

60. How is the oxygen content monitored in blood?

Correct : B. By Pulse Oximetry

61. What principle does pulse oximetry follow?

Correct : C. Beer – Lambert Law

62. The normal BP cuff using instrument is called as

Correct : B. Sphygmomanometer

63. Which instrument is used to listen to the Korotkoff sounds?

Correct : C. Piezoelectric Microphone

64. For infants, the pulse oximetry band is attached to their

Correct : D. foot

65. Which of the following devices/ methods do not use a cuff?

Correct : D. Continuous Slow Flow Flushing Method

66. Which type of transducer is commonly used for invasive blood pressure measurement?

Correct : C. Piezoelectric

67. Which of the following uses ultrasound to check the blood flow?

Correct : A. Doppler Shift Method

68. In the differential auscultatory technique, where is the pressure sensor located?

Correct : C. In the lower portion of the cuff

69. Which of the following statement is correct?

Correct : D. 190/110 mm Hg may harm vital organs

70. Blood pressure is the pressure exerted by blood against

Correct : B. artery walls

71. Blood pressure is measured in terms of

Correct : A. mm Hg

72. A person can suffer from both low blood pressure and high blood pressure.

Correct : A. True

73. A normal heart rate in an adult at rest is

Correct : D. 75

74. Unhealthy growth of tissue due to higher pressures on the walls of the artery is termed as

Correct : A. atheroma

75. Any mechanism that increases heart rate is said to have a positive effect.

Correct : C. chronotrophic

76. The colloid osmotic pressure of blood plasma is due to high concentration of

Correct : A. albumin

77. The sinoatrial node depolarizes more frequently under the influence of

Correct : C. norepinephrine

78. is the enzyme that converts Angiotensinogen to Angiotensin I.

Correct : A. Rennin

79. The plasma is a viscous, light red liquid, i.e. almost clear in the fasting stage.

Correct : B. False

80. method is based on the absorption of electromagnetic radiation in the visible, ultraviolet and infrared ranges.

Correct : C. Spectrophotometry

81. waves have short wave-length.

Correct : C. Gamma rays

82. The method based on the absorption of radiation of a substance is known as

Correct : D. Absorption spectrophotoscopy

83. The ratio of the radiant power transmitted by a sample to the radiant power incident on the sample is known as

Correct : B. Transmittance

84. If absorbance is plotted graphically against concentration, the graph is

Correct : C. Straight line

85. is not a source of radiant energy.

Correct : A. Tungsten-mercury lamp

86. Which of the following statements is false about single beam absorption instruments?

Correct : B. Beam splitter is used to get parallel beam

87. Which of the following statement is false about double beam absorption instruments?

Correct : C. Reference beam must have a higher intensity than sample beam

88. Which of the following is not an application of colorimeter?

Correct : D. Composition detection

89. In photometers, the readings of the specimen are initially obtained in the form of which of the following parameters?

Correct : A. Transmittance

90. Colorimeters are used in applications where great accuracy is required.

Correct : B. False

91. In the diagram of single beam photometer given below, identify the component that is not marked.

Correct : C. Sample holder

92. Colorimeters are used to determine the concentration of solutions.

Correct : A. True

93. Which of the following is the purpose of balance indicator in double beam photometer or colorimeter?

Correct : D. Indicates the difference between the output of two photometers

94. Which of the following is the purpose of the beam splitter in double beam photometer or colorimeter?

Correct : A. Splits beam into two equal intensity beams

95. Which of the following is a source used in spectroscopy?

Correct : D. Tungsten lamp

96. Which of the following indicate leakages in a condenser?

Correct : D. The concentration of sodium in steam and condensate are not equal

97. Which of the following are added for pH adjustment in sodium analyser?

Correct : D. Ammonia buffer

98. Normally, electrodes measure which of the following parameters?

Correct : A. Activity

99. Which of the following represent the concentration of a solution?

Correct : C. Free ions and bound ions

100. Sodium selective electrode provides a good response in measurement when the pH is above which of the following values?

Correct : D. 10