MCQOPTIONS
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MCQOPTIONS
This section includes 104 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. |
A diode is in the ________ state if the current established by the applied sources is such that its direction matches that of the arrow in the diode symbol and VD > 0.7 V. |
| A. | off |
| B. | reverse bias |
| C. | on |
| D. | transition |
| Answer» D. transition | |
| 52. |
The combination of a short circuit in series with an open circuit always results in a(n) ________ circuit. |
| A. | open |
| B. | short |
| C. | neither short nor open |
| D. | unknown |
| Answer» B. short | |
| 53. |
A germanium diode is approximated by ________ equivalent for voltages less than 0.3 V. |
| A. | a short circuit |
| B. | a series circuit |
| C. | a parallel circuit |
| D. | an open circuit |
| Answer» E. | |
| 54. |
As the load resistor increases, the slope of the dc load line and the levels of diode current ________. |
| A. | increase |
| B. | decrease |
| C. | remain unchanged |
| D. | are unpredictable |
| Answer» C. remain unchanged | |
| 55. |
The x-intercept of the load line with the characteristic curve is determined by the ________. |
| A. | load resistor |
| B. | diode |
| C. | source voltage and the load resistor |
| D. | source voltage |
| Answer» E. | |
| 56. |
The source voltage must be ________ the voltage drop across the diode to conduct the diode. |
| A. | larger than |
| B. | smaller than |
| C. | the same as |
| D. | None of the above |
| Answer» B. smaller than | |
| 57. |
In a voltage regulator network with fixed R L and R, what element dictates the minimum level of source voltage? |
| A. | V Z |
| B. | I Z |
| C. | I ZM |
| D. | None of the above |
| Answer» B. I Z | |
| 58. |
With this Zener diode in its "on state," what is the level of I Z for the maximum load resistance? |
| A. | 0 mA |
| B. | Undefined |
| C. | Equal to I RL |
| D. | I ZM |
| Answer» E. | |
| 59. |
Determine the voltage across the resistor. |
| A. | 0 V |
| B. | 0.09 V |
| C. | 0.2 V |
| D. | 0.44 V |
| Answer» B. 0.09 V | |
| 60. |
Determine the current through each diode if E 1 = E 2 = 0 V. |
| A. | 4.65 mA |
| B. | 9.3 mA |
| C. | 18.6 mA |
| D. | 0.7 mA |
| Answer» B. 9.3 mA | |
| 61. |
Determine the average value of the current through the load resistor. |
| A. | 2.5 mA |
| B. | 0 mA |
| C. | 1.37 mA |
| D. | 1.479 mA |
| Answer» E. | |
| 62. |
Which diode arrangement will supply a positive output voltage? |
| A. | a |
| B. | b |
| C. | c |
| D. | d |
| Answer» B. b | |
| 63. |
A silicon diode has a voltage to ground of –117 V from the anode. The voltage to ground from the cathode is –117.7 V. The diode is |
| A. | open. |
| B. | shorted. |
| C. | forward-biased. |
| D. | reverse-biased. |
| Answer» D. reverse-biased. | |
| 64. |
What is the logic function of this circuit? |
| A. | Positive logic AND gate |
| B. | Positive logic OR gate |
| C. | Negative logic AND gate |
| D. | Negative logic OR gate |
| Answer» B. Positive logic OR gate | |
| 65. |
List the categories of clippers. |
| A. | Series |
| B. | Parallel |
| C. | Series and parallel |
| D. | None of the above |
| Answer» D. None of the above | |
| 66. |
Rectifiers are commonly used in battery chargers. |
| A. | True |
| B. | False |
| C. | - |
| D. | - |
| Answer» B. False | |
| 67. |
In a voltage-multiplier circuit, the number of diodes is directly proportional to the multiplicative voltage factor. |
| A. | True |
| B. | False |
| C. | - |
| D. | - |
| Answer» B. False | |
| 68. |
Determine I D . |
| A. | 0 mA |
| B. | 1.893 mA |
| C. | 2.036 mA |
| D. | 2.143 mA |
| Answer» C. 2.036 mA | |
| 69. |
The output frequency of a half-wave rectifier is ________ the input frequency. |
| A. | one-half |
| B. | twice |
| C. | equal to |
| D. | none of the above |
| Answer» D. none of the above | |
| 70. |
A diode is in the "________" state if the current established by the applied sources is such that its direction matches that of the arrow in the diode symbol, and V D ? 0.7 V for Si and V D ? 0.3 V for Ge. |
| A. | off |
| B. | on |
| C. | neutral |
| D. | quiescent |
| Answer» C. neutral | |
| 71. |
Determine V o if E 1 = E 2 = 10 V. |
| A. | 9.3 V |
| B. | 10 V |
| C. | –10 V |
| D. | 0 V |
| Answer» C. –10 V | |
| 72. |
Which diode(s) has (have) a zero level current and voltage drop in the ideal model? |
| A. | Si |
| B. | Ge |
| C. | Both Si and Ge |
| D. | Neither Si nor Ge |
| Answer» D. Neither Si nor Ge | |
| 73. |
In a particular problem, which mode has the highest level of I DQ ? |
| A. | Ideal |
| B. | Approximate equivalent |
| C. | Exact mode using characteristic curve |
| D. | None of the above |
| Answer» B. Approximate equivalent | |
| 74. |
In the operation of a half-wave rectifier with a capacitor-input filter, the ripple factor can be lowered by ________ the value of the filter capacitor or ________ the load resistors. |
| A. | decreasing, decreasing |
| B. | decreasing, increasing |
| C. | increasing, decreasing |
| D. | increasing, increasing |
| Answer» E. | |
| 75. |
Calculate I L and I Z . |
| A. | 2 mA, 0 mA |
| B. | 4 mA, 2 mA |
| C. | 2 mA, 2 mA |
| D. | 2 mA, 4 mA |
| Answer» E. | |
| 76. |
If the ac supply is 60 Hz, what will be the ripple frequency out of the half-wave rectifier? |
| A. | 30 Hz |
| B. | 50 Hz |
| C. | 60 Hz |
| D. | 120 Hz |
| Answer» D. 120 Hz | |
| 77. |
Use the information provided here to determine the value of I DQ . |
| A. | 0 mA |
| B. | 4.3 mA |
| C. | 5 mA |
| D. | 10 mA |
| Answer» C. 5 mA | |
| 78. |
Determine the value of the load resistor. |
| A. | R L = 5 k |
| B. | R L = 5.5 k |
| C. | R L = 6 k |
| D. | None of the above |
| Answer» C. R L = 6 k | |
| 79. |
A silicon diode in a half-wave rectifier has a barrier potential of 0.7 V. This has the effect of |
| A. | reducing the peak output voltage by 0.7 V. |
| B. | increasing the peak output voltage by 0.7 V. |
| C. | reducing the peak input voltage by 0.7 V. |
| D. | no effect. |
| Answer» B. increasing the peak output voltage by 0.7 V. | |
| 80. |
Determine I D1 . |
| A. | 0 mA |
| B. | 29.40 mA |
| C. | 14.70 mA |
| D. | 14.09 mA |
| Answer» B. 29.40 mA | |
| 81. |
An open circuit can have any voltage across its terminals, but the current is always ________. |
| A. | 5 A |
| B. | 0 A |
| C. | 1 A |
| D. | - |
| Answer» C. 1 A | |
| 82. |
How many terminals do the 7800 series fixed positive voltage regulators have? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» C. 4 | |
| 83. |
If the ac supply is 50 Hz, what will be the ripple frequency out of the full-wave rectifier? |
| A. | 50 Hz |
| B. | 60 Hz |
| C. | 100 Hz |
| D. | 120 Hz |
| Answer» D. 120 Hz | |
| 84. |
Determine V 2 . |
| A. | 3.201 V |
| B. | 0 V |
| C. | 4.3 V |
| D. | 1.371 V |
| Answer» E. | |
| 85. |
Determine the current level if E = 15 V and R = 3 k . |
| A. | 0 A |
| B. | 4.76 mA |
| C. | 5 mA |
| D. | 5 A |
| Answer» C. 5 mA | |
| 86. |
What best describes the circuit? |
| A. | Full-wave rectifier |
| B. | Half-wave rectifier |
| C. | Clipper |
| D. | Clamper |
| Answer» B. Half-wave rectifier | |
| 87. |
What is the PIV for each diode in a full-wave center-tapped rectifier? Note : V p(out) = peak output voltage. |
| A. | V p(out) – 0.7 V |
| B. | V p(out) + 0.7 V |
| C. | 2V p(out) – 0.7 V |
| D. | 2V p(out) + 0.7 V |
| Answer» E. | |
| 88. |
In a regulated supply, what term describes how much change occurs in the output voltage over a certain range of load current values, from minimum to maximum current? |
| A. | line regulation |
| B. | voltage regulator |
| C. | current regulator |
| D. | load regulation |
| Answer» E. | |
| 89. |
Determine I D2 . |
| A. | 6.061 mA |
| B. | 0.7 mA |
| C. | 3.393 mA |
| D. | 3.571 mA |
| Answer» D. 3.571 mA | |
| 90. |
What type of diode circuit is used to add or restore a dc level to an electrical signal? |
| A. | clipper or limiter |
| B. | clamper |
| C. | IC voltage regulator |
| D. | none of the above |
| Answer» C. IC voltage regulator | |
| 91. |
What is the V RRM (PIV rating) for the 1N4001 rectifier diode? |
| A. | 50 V |
| B. | 100 V |
| C. | 200 V |
| D. | 400 V |
| Answer» B. 100 V | |
| 92. |
What is the peak inverse voltage across each diode in a voltage doubler? |
| A. | V m |
| B. | 2V m |
| C. | 0.5V m |
| D. | 0.25V m |
| Answer» C. 0.5V m | |
| 93. |
Determine the peak for both half cycles of the output waveform. |
| A. | 16 V, –4 V |
| B. | 16 V, 4 V |
| C. | –16 V, 4 V |
| D. | –16 V, –4 V |
| Answer» B. 16 V, 4 V | |
| 94. |
A short circuit has a ________ drop across its terminals, and the current is limited only by the surrounding network. |
| A. | 5 V |
| B. | 0 V |
| C. | 1 V |
| D. | - |
| Answer» C. 1 V | |
| 95. |
In a regulated supply, what term describes how much change occurs in the output voltage for a given change in the input voltage? |
| A. | load regulation |
| B. | voltage regulator |
| C. | line regulation |
| D. | ripple voltage |
| Answer» D. ripple voltage | |
| 96. |
Determine the peak value of the output waveform. |
| A. | 25 V |
| B. | 15 V |
| C. | –25 V |
| D. | –15 V |
| Answer» C. –25 V | |
| 97. |
Determine the peak value of the current through the load resistor. |
| A. | 2.325 mA |
| B. | 5 mA |
| C. | 1.25 mA |
| D. | 0 mA |
| Answer» B. 5 mA | |
| 98. |
PIV is which of the following? |
| A. | peak input voltage |
| B. | peak inverse voltage |
| C. | peak immediate voltage |
| D. | positive input voltage |
| Answer» C. peak immediate voltage | |
| 99. |
What is the voltage measured from the negative terminal of C 4 to the negative terminal of the transformer? |
| A. | –10 V |
| B. | –20 V |
| C. | 10 V |
| D. | 20 V |
| Answer» C. 10 V | |
| 100. |
The output frequency of a full-wave rectifier is ________ the input frequency. |
| A. | one-half |
| B. | equal to |
| C. | twice |
| D. | one-quarter |
| Answer» D. one-quarter | |