McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Biomedical Engineering .
Chapters
| 51. |
Letter F in the EEG electrode placement system denotes? |
| A. | front |
| B. | face |
| C. | frontal lobe |
| D. | fast |
| Answer» C. frontal lobe | |
| Explanation: F denotes frontal lobe of the head. The position of each electrode is specified using the International 10/20 system. Each electrode site is labeled with a letter and a number. | |
| 52. |
Normal EEG frequency range is |
| A. | 50-500Hz |
| B. | 0.5-50HZ |
| C. | 0.05-5Hz |
| D. | 1-200Hz |
| Answer» B. 0.5-50HZ | |
| Explanation: The frequency varies greatly with different behavioral states. The normal EEG frequency content ranges from 0.5 to 50Hz. The nature of the wave varies over the different parts of the scalp. | |
| 53. |
The letter T in the EEG electrode placement system denotes? |
| A. | temporal lope |
| B. | temper lobe |
| C. | trace |
| D. | timpanic |
| Answer» A. temporal lope | |
| Explanation: T denotes temporal lobe of the head. The position of each electrode is specified using the International 10/20 system. Each electrode site is labeled with a letter and a number. | |
| 54. |
According to the international 10/20 system to measure EEG, odd number denotes which side of the brain? |
| A. | left |
| B. | right |
| C. | top |
| D. | front |
| Answer» A. left | |
| Explanation: The position of each electrode is specified using the International 10/20 system. Each electrode site is labeled with a letter and a number. Odd number denotes the left side of the head. | |
| 55. |
The delta wave in EEG ranges from |
| A. | 0.5-4Hz |
| B. | 4-8Hz |
| C. | 8-13Hz |
| D. | 13-22Hz |
| Answer» A. 0.5-4Hz | |
| Explanation: The delta wave in EEG ranges from 0.5-4Hz. The theta wave in EEG ranges from 4-8Hz. The alpha wave in EEG ranges from 8-13Hz and beta from 13-22Hz. | |
| 56. |
Disturbance in the EEG pattern resulting from the external stimuli is called |
| A. | provoked response |
| B. | ckoored response |
| C. | evoked response |
| D. | impulse response |
| Answer» C. evoked response | |
| Explanation: Disturbance in the EEG pattern resulting from the external stimuli is called evoked response. The stimuli could be a flash light or a click of sound. The stimuli can be repeated and the EEG waveform can be observed to find the activities occurring because of the stimuli. | |
| 57. |
The peak to peak amplitude of the waves that can be picked from the scalp is |
| A. | 100mV |
| B. | 100V |
| C. | 100uV |
| D. | 10mV |
| Answer» C. 100uV | |
| Explanation: The EEG signal can be picked up with electrodes either from the scalp or directly from the cerebral cortex. The peak to peak amplitude of the waves that can be picked up from the scalp is normally 100uV. The frequency varies greatly with different behavioral states. | |
| 58. |
Which rhythm is the principal component of the EEG that indicates the alertness of the brain? |
| A. | theta rhythm |
| B. | gamma rhythm |
| C. | beta rhythm |
| D. | alpha rhythm |
| Answer» D. alpha rhythm | |
| Explanation: The alpha rhythm is the principal component of the EEG and is an indicator of the state of alertness of the brain. It serves as an indicator of the depth of anesthesia in the operating room. The frequency of the EEG seems to be affected by the mental activity of a person. Topic 2.4 EMG– unipolar and bipolar mode. | |
| 59. |
Which of the following is a preferred electrode for measuring EMG? |
| A. | surface electrodes |
| B. | needle electrodes |
| C. | pregelled electrodes |
| D. | scalp electrodes |
| Answer» B. needle electrodes | |
| Explanation: Electrodes for EMG work are usually of the needle type. Needle electrodes are used in clinical EMG, neurography and other electrophysiological measurements of the muscle tissues underneath the skin. Surface electrodes are preferred to measure ECG. Scalp electrodes for EEG. | |
| 60. |
Generally what is the material of needle electrodes? |
| A. | stainless steel |
| B. | copper |
| C. | lead |
| D. | iron |
| Answer» A. stainless steel | |
| Explanation: The material of the needle electrode is generally stainless steel. In spite of the face that stainless steel is unfavorable electrode material from the point of view of noise, it is preferred in EMG work. It is due to its mechanical solidity and low price. | |
| 61. |
Monopolar needle electrodes are having coatings of which material over the stainless steel wires which are bare only at the tips? |
| A. | carbon |
| B. | calcium |
| C. | sodium |
| D. | teflon |
| Answer» D. teflon | |
| Explanation: The monopolar needle electrode consists of a teflon coated stainless steel wire. The wire is bare only at the tip. It is found that after the needle has been used a number of times, the teflon coating will recede, increasing the tip area. The needle should be discarded when this happens. | |
| 62. |
Which electrode can be used to pick up signals from individual fibers of muscle tissues? |
| A. | biopolar needle electrode |
| B. | concentric core needle electrode |
| C. | multi-element needle electrode |
| D. | monopolar needle electrode |
| Answer» C. multi-element needle electrode | |
| Explanation: Multi-element needle electrodes are used to pick up the signals from individual fibers of muscle tissue. Special needles are available using 25-micron diameter electrode surfaces. They have up to 14 pickup surfaces down the side of one needle. | |
| 63. |
instrument is used to hold patients head and guide the placement of electrodes. |
| A. | Monotaxic |
| B. | Stereotonic |
| C. | Stereotaxic |
| D. | Monotonic |
| Answer» C. Stereotaxic | |
| Explanation: For measurement of potential from specific part of the brain, longer needles are inserted inside the head. The needles are precisely located by means of a map or atlas of the brain. A special instrument called stereotaxic instrument is used to hold the subject’s head and guide the placement of the electrodes. | |
| 64. |
Number of cloud deployment models that are recognized are |
| A. | 2 |
| B. | 5 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| Explanation: There are 3 recognized cloud deployment models. They are – Private cloud, Public cloud and Hybrid cloud. | |
| 65. |
The ground electrode is usually positioned over which body structures? |
| A. | bony |
| B. | hairy |
| C. | fleshy |
| D. | sweaty |
| Answer» A. bony | |
| Explanation: The ground electrode is usually positioned over bony structures rather than over large muscle masses, in the vicinity of the recording and stimulating electrodes, and where possible, equidistant from them. Hairy areas don’t transmit proper signals. It increases impedance of the skin. | |
| 66. |
When intramuscular EMG is required to look into the electrical activities of deeper or overlaid muscles, electrodes are used. |
| A. | plate shape electrodes |
| B. | surface electrodes |
| C. | thin thread electrodes |
| D. | fine wire electrodes |
| Answer» D. fine wire electrodes | |
| Explanation: When intramuscular EMG is required to look into the electrical activities of deeper or overlaid muscles, thin and flexible fine wire electrodes are used. These electrodes are inserted into the muscle site of interest. The needle or steel cannula is removed, and the electrode wires are connected to the steel spring adapters to minimize movement artefacts. | |
| 67. |
The contraction of the skeletal muscles results in the generation of action potential in the individual muscle fibers. Record of this action potential is called |
| A. | ECG |
| B. | EMG |
| C. | EEG |
| D. | EKG |
| Answer» B. EMG | |
| Explanation: The contraction of the skeletal muscles results in the generation of action potential in the individual muscle fibers, a record of such action potential is known as electromyogram (EMG). The activity is similar to that observed in the cardiac muscles (ECG or EKG), but in the skeletal muscles, repolarization takes place much more rapidly. The action potential lasts for only few milliseconds. | |
| 68. |
In voluntary contraction of the skeletal muscles, the muscle potential ranges from |
| A. | 50 uV – 5 mV |
| B. | 50 mV – 5 V |
| C. | 0.05 uV – 2 mV |
| D. | 50 mV – 500 mV |
| Answer» A. 50 uV – 5 mV | |
| Explanation: In voluntary contraction of the skeletal muscles, the muscle potential ranges from 50 uV – 5 mV and duration from 2 to 15 ms. The values vary with the anatomic position of the muscle and the size and location of the electrode. In a relaxed muscle there are no action potentials. | |
| 69. |
Bio potential amplifiers have input terminals. |
| A. | 3 |
| B. | 4 |
| C. | 5 |
| D. | 6 |
| Answer» A. 3 | |
| 70. |
The ability of the amplifier to reject common voltages on its two input leads is known as |
| A. | common mode rejection rate |
| B. | coupled mode rejection rate |
| C. | common mode rejection ratio |
| D. | coupled mode rejection ratio |
| Answer» C. common mode rejection ratio | |
| 71. |
CMRR is measured in |
| A. | V/s |
| B. | dB |
| C. | dB/s |
| D. | dB/ms |
| Answer» B. dB | |
| 72. |
CMRR of the preamplifiers should be as high as possible. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 73. |
The output of differential gain is given by |
| A. | (difference of the two input voltage)*(feedback resistance/input resistance) |
| B. | (sum of the two input voltage)*(feedback resistance/input resistance) |
| C. | (difference of the two input voltage)*(input resistance/feedback resistance) |
| D. | (sum of the two input voltage)*(input resistance/feedback resistance) |
| Answer» A. (difference of the two input voltage)*(feedback resistance/input resistance) | |
| 74. |
In order to be able to minimize the effects of changes occurring in the electrode impedances, it is necessary to employ a preamplifier having a high input impedance. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 75. |
The impedance of the input should be in order to obtain high CMRR in the differential amplifier. |
| A. | low |
| B. | High |
| C. | Does not matter |
| D. | Very low |
| Answer» B. High | |
| 76. |
A Differential Amplifier should have collector resistor’s value (RC1 & RC2) as |
| A. | 5kΩ, 5kΩ |
| B. | 5Ω, 10kΩ |
| C. | 5Ω, 5kΩ |
| D. | 5kΩ, 10kΩ |
| Answer» A. 5kΩ, 5kΩ | |
| 77. |
A Differential Amplifier amplifies |
| A. | Input signal with higher voltage |
| B. | Input voltage with smaller voltage |
| C. | Sum of the input voltage |
| D. | None of the Mentioned |
| Answer» D. None of the Mentioned | |
| 78. |
The value of emitter resistance in Emitter Biased circuit are RE1=25kΩ & RE2=16kΩ. Find RE |
| A. | 9.756kΩ |
| B. | 41kΩ |
| C. | 9.723kΩ |
| D. | 10kΩ |
| Answer» A. 9.756kΩ | |
| 79. |
If output is measured between two collectors of transistors, then the Differential amplifier with two input signal is said to be configured as |
| A. | Dual Input Balanced Output |
| B. | Dual Input Unbalanced Output |
| C. | Single Input Balanced Output |
| D. | Dual Input Unbalanced Output |
| Answer» A. Dual Input Balanced Output | |
| 80. |
A differential amplifier is capable of amplifying |
| A. | DC input signal only |
| B. | AC input signal only |
| C. | AC & DC input signal |
| D. | None of the Mentioned |
| Answer» C. AC & DC input signal | |
| 81. |
In ideal Differential Amplifier, if same signal is given to both inputs, then output will be |
| A. | Same as input |
| B. | Double the input |
| C. | Not equal to zero |
| D. | Zero |
| Answer» D. Zero | |
| 82. |
An emitter bias Dual Input Balanced Output differential amplifier has VCC=20v, β=100, VBE=0.7v, RE=1.3kΩ. Find IE |
| A. | 7.42mA |
| B. | 9.8mA |
| C. | 10mA |
| D. | 8.6mA |
| Answer» A. 7.42mA | |
| 83. |
Find IC, given VCE=0.77v, VCC=10v, VBE=0.37v and RC=2.4kΩ in Dual Input Balanced Output differential amplifier |
| A. | 0.4mA |
| B. | 0.4A |
| C. | 4mA |
| D. | 4A |
| Answer» C. 4mA | |
| 84. |
For the circuit shown below, determine the Output voltage (Assume β=5, differential input resistance=12 kΩ) |
| A. | 4.33v |
| B. | 2.33v |
| C. | 3.33v |
| D. | 1.33v |
| Answer» C. 3.33v | |
| 85. |
In a Single Input Balanced Output Differential amplifier, given VCC=15v, RE = 3.9kΩ, VCE=2.4 v and re=250Ω. Determine Voltage gain |
| A. | 26 |
| B. | 56 |
| C. | 38 |
| D. | 61 |
| Answer» A. 26 | |
| 86. |
The characteristic impedance of a quarter wave transformer with load and input impedances given by 30 and 75 respectively is |
| A. | 47.43 |
| B. | 37.34 |
| C. | 73.23 |
| D. | 67.45 |
| Answer» A. 47.43 | |
| 87. |
For a matched line, the input impedance will be equal to |
| A. | Load impedance |
| B. | Characteristic impedance |
| C. | Output impedance |
| D. | Zero |
| Answer» B. Characteristic impedance | |
| 88. |
The reflection coefficient lies in the range of |
| A. | 0 < τ < 1 |
| B. | -1 < τ < 1 |
| C. | 1 < τ < ∞ |
| D. | 0 < τ < ∞ |
| Answer» A. 0 < τ < 1 | |
| 89. |
When the ratio of load voltage to input voltage is 5, the ratio of the characteristic impedance to the input impedance is |
| A. | 1/5 |
| B. | 5 |
| C. | 10 |
| D. | 25 |
| Answer» B. 5 | |
| 90. |
The power of the transmitter with a radiation resistance of 12 ohm and an antenna current of 3.5A is |
| A. | 147 |
| B. | 741 |
| C. | 174 |
| D. | 471 |
| Answer» A. 147 | |
| 91. |
The group delay of the wave with phase constant of 62.5 units and frequency of 4.5 radian/sec is |
| A. | 13.88 |
| B. | 31.88 |
| C. | 88.13 |
| D. | 88.31 |
| Answer» A. 13.88 | |
| 92. |
5 is" The maximum impedance of a transmission line 50 ohm and the standing wave ratio of |
| A. | 20 |
| B. | 125 |
| C. | 200 |
| D. | 75 |
| Answer» B. 125 | |
| 93. |
5 and Zo = 50, we get Zmax = 2.5 x 50 = 125 ohm. "9. |
| A. | " The minimum impedance of a transmission line 75 ohm with a standing wave ratio of 4 is 75 |
| B. | 300 |
| C. | 18.75 |
| D. | 150 |
| Answer» C. 18.75 | |
| 94. |
The average power in an electromagnetic wave is given by |
| A. | propagation constant |
| B. | poynting vector |
| C. | phase constant |
| D. | attenuation constant |
| Answer» B. poynting vector | |
| 95. |
The characteristic impedance of a transmission line is normally chosen to be |
| A. | 50 |
| B. | 75 |
| C. | 50 or 75 |
| D. | 100 |
| Answer» C. 50 or 75 | |
| 96. |
Identify the material which is not present in a transmission line setup. |
| A. | waveguides |
| B. | cavity resonator |
| C. | antenna |
| D. | oscillator |
| Answer» D. oscillator | |
| 97. |
What is the Common Mode Rejection Ratio? |
| A. | Output of a differential amplifier |
| B. | Ability of an amplifier to reject common mode signals |
| C. | Ability of an amplifier to accept common mode signals |
| D. | None of the mentioned |
| Answer» B. Ability of an amplifier to reject common mode signals | |
| 98. |
Which of the following is not a characteristic of an ideal op-amp? |
| A. | Zero slew rate |
| B. | Infinite bandwidth |
| C. | Infinite input impedance |
| D. | Zero output impedance |
| Answer» A. Zero slew rate | |
| 99. |
For an inverting amplifier positive terminal of input is connected to of 741 IC. |
| A. | Pin number 3 |
| B. | Pin number 2 |
| C. | Pin number 1 |
| D. | Pin number 7 |
| Answer» B. Pin number 2 | |
| 100. |
In 741 IC, pin number 4 is represented by |
| A. | Offset null |
| B. | Positive input |
| C. | Negative input |
| D. | Negative supply |
| Answer» D. Negative supply | |
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