MCQOPTIONS
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MCQOPTIONS
This section includes 177 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
When the voltage across a capacitor is tripled, the stored charge |
| A. | Triples |
| B. | Is cut to one-third |
| C. | Stays the same |
| D. | Doubles |
| Answer» B. Is cut to one-third | |
| 52. |
A capacitor of 2,000 pF is greater than |
| A. | 0.02 µF |
| B. | 0.002 µF |
| C. | 0.0002 µF |
| D. | 0.0000002 F |
| Answer» D. 0.0000002 F | |
| 53. |
Five time constants are required for a capacitor to charge fully or discharge fully. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 54. |
Voltage leads current by 90° in a capacitor. |
| A. | True |
| B. | False |
| Answer» C. | |
| 55. |
What is the capacitance when Q = 60 µC and V = 12 V? |
| A. | 720 µF |
| B. | 5 µF |
| C. | 50 µF |
| D. | 12 µF |
| Answer» C. 50 µF | |
| 56. |
A 330 pF capacitor and a 220 pF capacitor are each connected across a 6 V dc source. The voltage across the 330 pF capacitor is |
| A. | 3 V |
| B. | 6 V |
| C. | 4 V |
| D. | 0 V |
| Answer» C. 4 V | |
| 57. |
A sine wave voltage is applied across a capacitor. When the frequency of the voltage is decreased, the current |
| A. | Increases |
| B. | Remains constant |
| C. | Decreases |
| D. | Ceases |
| Answer» D. Ceases | |
| 58. |
Which of the following capacitors is polarized? |
| A. | Mica |
| B. | Ceramic |
| C. | Plastic-film |
| D. | Electrolytic |
| Answer» E. | |
| 59. |
A 2 µF, a 4 µF, and a 10 µF capacitor are connected in series. The total capacitance is less than |
| A. | 2 µF |
| B. | 4 µF |
| C. | 10 µF |
| D. | 1.5 µF |
| Answer» E. | |
| 60. |
When the plate area of a capacitor increases, |
| A. | The capacitance increases |
| B. | The capacitance decreases |
| C. | The capacitance is unaffected |
| D. | The voltage it can withstand increases |
| Answer» B. The capacitance decreases | |
| 61. |
A 12 kHz voltage is applied to a 0.33 µF capacitor, and 200 mA of rms current is measured. What is the value of the voltage? |
| A. | 8 V |
| B. | 80 V |
| C. | 800 V |
| D. | 0.88 V |
| Answer» B. 80 V | |
| 62. |
The opposition to ac from a capacitor is called reluctance. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 63. |
When a capacitor is charging, current will flow through its dielectric. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 64. |
This circuit is an RC integrator. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 65. |
Capacitance is directly proportional to the dielectric constant and the distance between its plates and inversely proportional to the area of the plates. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 66. |
A capacitor takes ___ time constants to charge to 95% of its capacity. |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» C. 4 | |
| 67. |
Capacitors in parallel have a higher total value than any individual capacitor. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 68. |
In an RC series circuit VS = VC + VR. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 69. |
The term “integrator” is derived from a mathematical function in trigonometry. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 70. |
The impedance in an RC parallel circuit is |
| A. | 1 |
| B. | |
| Answer» C. | |
| 71. |
The reactance of C2 is _____ in the given circuit. |
| A. | 66 |
| B. | 80 |
| C. | 199 |
| D. | 398 |
| Answer» E. | |
| 72. |
This circuit is a low-pass filter. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 73. |
The ___ of a capacitor affects the time it takes to charge and discharge. |
| A. | package style |
| B. | lead arrangement |
| C. | plate area |
| D. | voltage rating |
| Answer» D. voltage rating | |
| 74. |
The true power in an RC series circuit is PR = I2 x R. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 75. |
The frequency response curve illustrates that as the frequency of the input increases, the voltage of the output will decrease. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 76. |
The ______ the area of the plates, the greater the number of electrons and ______ that can be stored. |
| A. | larger, charge |
| B. | smaller, charge |
| C. | larger, polarity |
| D. | smaller, polarity |
| Answer» B. smaller, charge | |
| 77. |
In a series capacitive circuit the smallest capacitor will have the largest voltage drop across it. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 78. |
An ohmmeter can be used to test a capacitor. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 79. |
The given image is a _____ capacitor. |
| A. | 0.33 pF |
| B. | 0.00033 F |
| C. | 33,000 pF |
| D. | 0.33 F |
| Answer» E. | |
| 80. |
A discharged capacitor has ______ charges on its plates. |
| A. | no |
| B. | unequal |
| C. | equal |
| D. | negative |
| Answer» D. negative | |
| 81. |
The phase angle of an RC series circuit is = invtan (XC/R) = invtan (VC/VR). |
| A. | 1 |
| B. | |
| Answer» B. | |
| 82. |
A high-pass filter heavily attenuates the higher frequencies. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 83. |
Capacitors are often used as filters. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 84. |
The greater the distance between the plates of a capacitor, the smaller the capacitance value. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 85. |
The rate of charge or discharge of a capacitor is based on ___ function. |
| A. | an exponential |
| B. | a linear |
| C. | a parabolic |
| D. | a trigonometric |
| Answer» B. a linear | |
| 86. |
Between any two time constants, the charge on a capacitor changes about 63%. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 87. |
The impedance of an RC series circuit is (R2 +C2)1/2. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 88. |
The frequency response curve for a low-pass filter illustrates that as the frequency of the input increases, the voltage of the output will decrease. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 89. |
A source voltage across a capacitor will: |
| A. | lead the current by 90 degrees |
| B. | lead the current by 180 degrees |
| C. | lag the current by 90 degrees |
| D. | lag the current by 180 degrees |
| Answer» D. lag the current by 180 degrees | |
| 90. |
The total circuit reactance is ______ in the given circuit. |
| A. | 50 |
| B. | 140 |
| C. | 265 |
| D. | 676 |
| Answer» D. 676 | |
| 91. |
A capacitor is charged when one of its plates has more electrons than the other plate. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 92. |
If an open capacitor is checked with an ohmmeter, the needle will: |
| A. | stay on zero |
| B. | stay on infinity |
| C. | move from zero to infinity |
| D. | move from infinity to zero |
| Answer» C. move from zero to infinity | |
| 93. |
As a capacitor is being charged, the voltage across its terminals will: |
| A. | increase |
| B. | decrease |
| C. | remain the same |
| D. | oppose the source |
| Answer» B. decrease | |
| 94. |
With a 500 kHz signal source, what would be the value of a capacitor yielding a capacitive reactance of 1 k ? |
| A. | 318 pF |
| B. | 2 nF |
| C. | 3.18 F |
| D. | 2 F |
| Answer» B. 2 nF | |
| 95. |
The basic capacitor is made up of ___ that separates two conductive plates. |
| A. | a conductor |
| B. | a spacer |
| C. | a dielectric |
| D. | an electrode |
| Answer» D. an electrode | |
| 96. |
The unit of capacitance is a farad; one farad stores one coulomb of charge or 6.24 x 1018 electrons. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» B. | |
| 97. |
In an ac circuit, an output capacitor and a resistor are connected in series with an ac signal. What filter action will be the result? |
| A. | bandpass |
| B. | low-pass |
| C. | high-pass |
| D. | band-stop |
| Answer» C. high-pass | |
| 98. |
If a charged capacitor is disconnected from a circuit, it will: |
| A. | immediately discharge |
| B. | recharge |
| C. | remain charged |
| D. | leak the charge |
| Answer» E. | |
| 99. |
The term ______ is derived from a mathematical function in calculus. |
| A. | differentiator |
| B. | integrator |
| C. | filter |
| D. | voltage-divider |
| Answer» C. filter | |
| 100. |
If the dielectric constant of a capacitor is decreased, then its capacitance will: |
| A. | increase |
| B. | decrease |
| C. | remain the same |
| D. | be destroyed |
| Answer» C. remain the same | |