MCQOPTIONS
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MCQOPTIONS
This section includes 93 Mcqs, each offering curated multiple-choice questions to sharpen your Active Filter Circuits knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
What is (are) the principal area(s) of application for isolation amplifiers? |
| A. | medical |
| B. | power plant |
| C. | automation |
| D. | all of the above |
| Answer» E. | |
| 52. |
A log amplifier has ________ in the feedback loop. |
| A. | a diode |
| B. | a BJT |
| C. | a resistor |
| D. | either a diode or a BJT |
| Answer» E. | |
| 53. |
A current-to-voltage converter produces a |
| A. | constant output voltage for a variable input current. |
| B. | variable output voltage for a constant input current. |
| C. | proportional output voltage for a variable input current. |
| D. | proportional output current for a variable input voltage. |
| Answer» D. proportional output current for a variable input voltage. | |
| 54. |
A log amplifier may use the ________ junction of a BJT in the feedback loop. |
| A. | base-collector |
| B. | base-emitter |
| C. | emitter-collector |
| D. | emitter-ground |
| Answer» C. emitter-collector | |
| 55. |
Refer to given circuits. Which circuit is known as a peak detector? |
| A. | a |
| B. | b |
| C. | c |
| D. | d |
| Answer» D. d | |
| 56. |
The main purpose of an instrumentation amplifier is to amplify ________ signals that are riding on ________ common-mode voltages. |
| A. | small, small |
| B. | small, large |
| C. | large, small |
| D. | large, large |
| Answer» C. large, small | |
| 57. |
Refer to given circuits. Which circuit is known as a voltage-to-current converter? |
| A. | a |
| B. | b |
| C. | c |
| D. | d |
| Answer» C. c | |
| 58. |
A(n) ________ amplifier is a differential voltage-gain device that amplifies the difference between the voltages existing at its two input terminals. |
| A. | instrumentation |
| B. | isolation |
| C. | operational transconductance |
| D. | log |
| Answer» B. isolation | |
| 59. |
Refer to the given figure. This circuit is a setup for |
| A. | an antilog amplifier. |
| B. | a constant-current source. |
| C. | an instrumentation amplifier. |
| D. | an isolation amplifier. |
| Answer» E. | |
| 60. |
Refer to given circuits. Which circuit is known as a current-to-voltage converter? |
| A. | a |
| B. | b |
| C. | c |
| D. | d |
| Answer» B. b | |
| 61. |
Refer to given circuits. Which circuit is known as an OTA? |
| A. | a |
| B. | b |
| C. | c |
| D. | d |
| Answer» E. | |
| 62. |
Instrumentation amplifiers are normally used to measure |
| A. | small differential signal voltages. |
| B. | signals superimposed on a common-mode voltage often much larger than the signal voltage. |
| C. | both of the above |
| D. | none of the above |
| Answer» D. none of the above | |
| 63. |
A basic ________ amplifier is formed by three op-amps and seven resistors. |
| A. | instrumentation |
| B. | isolation |
| C. | log |
| D. | antilog |
| Answer» B. isolation | |
| 64. |
The voltage gain of a basic instrumentation amplifier is set by a(n) |
| A. | diode. |
| B. | capacitor. |
| C. | resistor. |
| D. | inductor. |
| Answer» D. inductor. | |
| 65. |
A varactor is a pn junction diode that always operates in ________-bias and is doped to ________ the inherent capacitance of the depletion region. |
| A. | forward, maximize |
| B. | reverse, maximize |
| C. | reverse, minimize |
| D. | forward, minimize |
| Answer» C. reverse, minimize | |
| 66. |
A laser diode normally emits |
| A. | coherent light. |
| B. | monochromatic light. |
| C. | coherent and monochromatic light. |
| D. | neither coherent nor monochromatic light. |
| Answer» D. neither coherent nor monochromatic light. | |
| 67. |
What type of diode is commonly used in electronic tuners in TVs? |
| A. | varactor |
| B. | Schottky |
| C. | LED |
| D. | Gunn |
| Answer» B. Schottky | |
| 68. |
A tunnel diode is used |
| A. | in high-power circuits. |
| B. | in circuits requiring negative resistance. |
| C. | in very fast-switching circuits. |
| D. | in power supply rectifiers. |
| Answer» C. in very fast-switching circuits. | |
| 69. |
Back-to-back varactor diodes are used for what reason? |
| A. | over-voltage protection |
| B. | a wider tuning range |
| C. | to eliminate harmonic distortion |
| D. | no reason; only zeners are used in a back-to-back configuration |
| Answer» D. no reason; only zeners are used in a back-to-back configuration | |
| 70. |
What diode is used in seven-segment displays? |
| A. | zener |
| B. | LED |
| C. | laser |
| D. | Schottky |
| Answer» C. laser | |
| 71. |
Zener diodes with breakdown voltages greater than 5 V operate predominantly in what type of breakdown? |
| A. | avalanche |
| B. | zener |
| C. | varactor |
| D. | Schottky |
| Answer» B. zener | |
| 72. |
Refer to this figure. If V IN decreases, I R will |
| A. | increase. |
| B. | decrease. |
| C. | remain the same. |
| D. | - |
| Answer» C. remain the same. | |
| 73. |
What diode operates only with majority carriers? |
| A. | laser |
| B. | tunnel |
| C. | Schottky |
| D. | step-recovery |
| Answer» D. step-recovery | |
| 74. |
What type of diode maintains a constant current? |
| A. | LED |
| B. | zener |
| C. | current regulator |
| D. | pin |
| Answer» D. pin | |
| 75. |
Refer to this figure. Which symbol is correct for a photodiode? |
| A. | a |
| B. | b |
| C. | c |
| D. | d |
| Answer» D. d | |
| 76. |
Refer to this figure. If the load current increases, I R will ________ and I Z will ________. |
| A. | remain the same, increase |
| B. | decrease, remain the same |
| C. | increase, remain the same |
| D. | remain the same, decrease |
| Answer» E. | |
| 77. |
An 8.2 V zener has a resistance of 5 . The actual voltage across its terminals when the current is 25 mA is |
| A. | 8.2 V. |
| B. | 125 mV. |
| C. | 8.325 V. |
| D. | 8.075 V. |
| Answer» D. 8.075 V. | |
| 78. |
The process of emitting photons from a semiconductive material is called |
| A. | photoluminescence. |
| B. | gallium arsenide. |
| C. | electroluminescence. |
| D. | gallium phosphide. |
| Answer» D. gallium phosphide. | |
| 79. |
Refer to this figure. Find the tunnel diode symbol. |
| A. | a |
| B. | b |
| C. | c |
| D. | d |
| Answer» E. | |
| 80. |
A 6.2 V zener is rated at 1 watt. The maximum safe current the zener can carry is |
| A. | 1.61 A. |
| B. | 161 mA. |
| C. | 16.1 mA. |
| D. | 1.61 mA. |
| Answer» C. 16.1 mA. | |
| 81. |
An LED is forward-biased. The diode should be on, but no light is showing. A possible trouble might be |
| A. | the diode is open. |
| B. | the series resistor is too small. |
| C. | none. The diode should be off if forward-biased. |
| D. | the power supply voltage is too high. |
| Answer» B. the series resistor is too small. | |
| 82. |
The normal operating region for a zener diode is the |
| A. | forward-bias region. |
| B. | reverse-bias region. |
| C. | zero-crossing region. |
| D. | reverse-breakdown region. |
| Answer» E. | |
| 83. |
Refer to this figure. If V IN attempts to increase, V R will |
| A. | increase. |
| B. | decrease. |
| C. | remain the same. |
| D. | - |
| Answer» B. decrease. | |
| 84. |
LEDs are made out of |
| A. | silicon. |
| B. | germanium. |
| C. | gallium. |
| D. | silicon and germanium, but not gallium. |
| Answer» D. silicon and germanium, but not gallium. | |
| 85. |
Which diode employs graded doping? |
| A. | zener |
| B. | LED |
| C. | tunnel |
| D. | step-recovery |
| Answer» E. | |
| 86. |
Refer to this figure. Which symbol is correct for a zener diode? |
| A. | a |
| B. | b |
| C. | c |
| D. | d |
| Answer» C. c | |
| 87. |
What kind of diode is formed by joining a doped semiconductor region with a metal? |
| A. | laser |
| B. | tunnel |
| C. | pin |
| D. | Schottky |
| Answer» E. | |
| 88. |
Zener diodes with breakdown voltages less than 5 V operate predominantly in what type of breakdown? |
| A. | avalanche |
| B. | zener |
| C. | varactor |
| D. | Schottky |
| Answer» C. varactor | |
| 89. |
Refer to this figure. If V IN increases, I Z will |
| A. | increase. |
| B. | decrease. |
| C. | remain the same. |
| D. | - |
| Answer» B. decrease. | |
| 90. |
Refer to this figure. Which symbol is correct for an LED? |
| A. | a |
| B. | b |
| C. | c |
| D. | d |
| Answer» B. b | |
| 91. |
You have an application for a diode to be used in a tuning circuit. A type of diode to use might be |
| A. | an LED. |
| B. | a Schottky diode. |
| C. | a Gunn diode. |
| D. | a varactor. |
| Answer» E. | |
| 92. |
The Schottky diode is used |
| A. | in high-power circuits. |
| B. | in circuits requiring negative resistance. |
| C. | in very fast-switching circuits. |
| D. | in power supply rectifiers. |
| Answer» D. in power supply rectifiers. | |
| 93. |
Schottky diodes are also known as |
| A. | PIN diodes. |
| B. | hot carrier diodes. |
| C. | step-recovery diodes. |
| D. | tunnel diodes. |
| Answer» C. step-recovery diodes. | |