MCQOPTIONS
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MCQOPTIONS
This section includes 78 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
_ A crystal diode has$? |
| A. | one pn junction |
| B. | two pn junctions |
| C. | three pn junctions |
| D. | none of the above |
| Answer» B. two pn junctions | |
| 52. |
_ The ratio of reverse resistance and forward resistance of a germanium crystal diode is about ___________$? |
| A. | 1 : 1 |
| B. | 100 : 1 |
| C. | 1000 : 1 |
| D. | 40000 : 1 |
| Answer» E. | |
| 53. |
_ Mains a.c. power is converrted into d.c. power for ___________$? |
| A. | lighting purposes |
| B. | heaters |
| C. | using in electronic equipment |
| D. | none of the above |
| Answer» D. none of the above | |
| 54. |
_ When the graph between current through and voltage across a device is a straight line, the device is referred to as ___________$? |
| A. | linear |
| B. | active |
| C. | nonlinear |
| D. | passive |
| Answer» B. active | |
| 55. |
_ The most widely used rectifier is ___________$? |
| A. | half-wave rectifier |
| B. | centre-tap full-wave rectifier |
| C. | bridge full-wave rectifier |
| D. | none of the above |
| Answer» D. none of the above | |
| 56. |
_ ___________ rectifier has the lowest forward resistance$? |
| A. | solid state |
| B. | vacuum tube |
| C. | gas tube |
| D. | none of the above |
| Answer» B. vacuum tube | |
| 57. |
_ If the temperature of a crystal diode increases, then leakage current ___________$? |
| A. | remains the same |
| B. | decreases |
| C. | increases |
| D. | becomes zero |
| Answer» D. becomes zero | |
| 58. |
_A crystal diode is a ___________ device$? |
| A. | non-linear |
| B. | bilateral |
| C. | linear |
| D. | none of the above |
| Answer» B. bilateral | |
| 59. |
_The forward voltage drop across a silicon diode is about ___________$? |
| A. | 2.5 V |
| B. | 3 V |
| C. | 10 V |
| D. | 0.7 V |
| Answer» E. | |
| 60. |
_The reverse current in a diode is of the order of ___________$? |
| A. | kA |
| B. | mA |
| C. | μA |
| D. | A |
| Answer» D. A | |
| 61. |
_The PIV rating of each diode in a bridge rectifier is ___________ that of the equivalent centre-tap rectifier$? |
| A. | one-half |
| B. | the same as |
| C. | twice |
| D. | four times |
| Answer» B. the same as | |
| 62. |
_The maximum efficiency of a half-wave rectifier is ___________$? |
| A. | 40.6% |
| B. | 81.2% |
| C. | 50% |
| D. | 25% |
| Answer» B. 81.2% | |
| 63. |
_A zener diode utilizes ___________ characteristics for its operation.$? |
| A. | forward |
| B. | reverse |
| C. | both forward and reverse |
| D. | none of the above |
| Answer» C. both forward and reverse | |
| 64. |
_When the crystal current diode current is large, the bias is ___________$? |
| A. | forward |
| B. | inverse |
| C. | poor |
| D. | reverse |
| Answer» B. inverse | |
| 65. |
A zener diode is always ___________ connected.? |
| A. | reverse |
| B. | forward |
| C. | either reverse or forward |
| D. | none of the above |
| Answer» B. forward | |
| 66. |
A series resistance is connected in the zener circuit to___________? |
| A. | properly reverse bias the zener |
| B. | protect the zener |
| C. | properly forward bias the zener |
| D. | none of the above |
| Answer» C. properly forward bias the zener | |
| 67. |
A crystal diode has forward resistance of the order of ___________? |
| A. | kΩ |
| B. | Ω |
| C. | MΩ |
| D. | none of the above |
| Answer» C. M≈í¬© | |
| 68. |
When a crystal diode is used as a rectifier, the most important consideration is ___________? |
| A. | forward characteristic |
| B. | doping level |
| C. | reverse characteristic |
| D. | PIC rating |
| Answer» E. | |
| 69. |
The ripple factor of a half-wave rectifier is ___________? |
| A. | 2 |
| B. | 1.21 |
| C. | 2.5 |
| D. | 0.48 |
| Answer» E. | |
| 70. |
The leakage current in a crystal diode is due to ___________? |
| A. | minority carriers |
| B. | majority carriers |
| C. | junction capacitance |
| D. | none of the above |
| Answer» B. majority carriers | |
| 71. |
In the breakdown region, a zener didoe behaves like a ___________ source. |
| A. | constant voltage |
| B. | constant current |
| C. | constant resistance |
| D. | none of the above |
| Answer» B. constant current | |
| 72. |
A zener diode has ___________ breakdown voltage |
| A. | undefined |
| B. | sharp |
| C. | zero |
| D. | none of the above |
| Answer» C. zero | |
| 73. |
If the doping level in a crystal diode is increased, the width of depletion layer___________ |
| A. | remains the same |
| B. | is decreased |
| C. | in increased |
| D. | none of the above |
| Answer» D. none of the above | |
| 74. |
If the doping level of a crystal diode is increased, the breakdown voltage___________ |
| A. | remains the same |
| B. | is increased |
| C. | is decreased |
| D. | none of the above |
| Answer» D. none of the above | |
| 75. |
If the a.c. input to a half-wave rectifier is an r.m.s value of 400/‚à ö2 volts, then diode PIV rating is ___________# |
| A. | 400/‚à ö2 V |
| B. | 400 V |
| C. | 400 x ‚à ö2 V |
| D. | none of the above |
| Answer» C. 400 x ‚Äö√ √∂2 V | |
| 76. |
A crystal diode utilises ___________ characteristic for rectification |
| A. | reverse |
| B. | forward |
| C. | forward or reverse |
| D. | none of the above |
| Answer» C. forward or reverse | |
| 77. |
A zener diode is ___________ device |
| A. | a non-linear |
| B. | a linear |
| C. | an amplifying |
| D. | none of the above |
| Answer» B. a linear | |
| 78. |
If the arrow of crystal diode symbol is positive w.r.t. bar, then diode is ___________ biased. |
| A. | forward |
| B. | reverse |
| C. | either forward or reverse |
| D. | none of the above |
| Answer» B. reverse | |