MCQOPTIONS
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MCQOPTIONS
This section includes 72 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. |
In GSM, the interface which connects BTS to BSC is called: |
| A. | SS7 |
| B. | Abis |
| C. | Um |
| D. | A |
| Answer» C. Um | |
| 52. |
For communication from satellite to the earth station, microwave frequencies are used because: |
| A. | Loss is minimum |
| B. | Noise added to signal is low in this window |
| C. | These do not get reflected back by ionosphere |
| D. | Many channels can be used |
| Answer» E. | |
| 53. |
For an earth station transmitter input power of 40 dBW (10,000 W), with a backoff loss of 3 dB, a total branching and feeder loss of 3 dB, and a transmit antenna gain of 40 dB, determine the EIRP. |
| A. | 40 dBW |
| B. | 74 dBW |
| C. | 34 dBW |
| D. | 80 dBW |
| Answer» C. 34 dBW | |
| 54. |
INSAT-2E was launched from |
| A. | India |
| B. | French Guiana |
| C. | Peru |
| D. | Mayotte |
| Answer» C. Peru | |
| 55. |
In case of satellite communication. |
| A. | Uplink frequency > Downlink frequency |
| B. | Downlink frequency > Uplink frequency |
| C. | Downlink frequency = Uplink frequency |
| D. | None of the above |
| Answer» B. Downlink frequency > Uplink frequency | |
| 56. |
Assertion A): In satellite communication, uplink and downlink frequencies are kept different.Reason R): The uplink frequency is chosen to be of lower value than the down link frequency.Choose the correct answer: |
| A. | Both A) and R) are true and R) is the correct explanation of A |
| B. | Both A) and R) are true, but R) is not the correct explanation of A |
| C. | is true, but R) is false |
| D. | is false, but R) is true |
| Answer» D. is false, but R) is true | |
| 57. |
A virtual ground |
| A. | is a ground for both voltage and current |
| B. | is a ground for voltage |
| C. | is a ground for voltage but not for current |
| D. | is ground for current |
| Answer» D. is ground for current | |
| 58. |
The negative potential at the control grid in a vacuum triode that causes plate current Zero is called |
| A. | cut in voltage |
| B. | cut off bias |
| C. | forward blocking voltage |
| D. | reverse blocking voltage |
| Answer» C. forward blocking voltage | |
| 59. |
An intrinsic semiconductor at the absolute zero temperature |
| A. | behaves like an insulator |
| B. | behaves like a metallic conductor |
| C. | has a large number of electrons |
| D. | has a large number of holes |
| Answer» B. behaves like a metallic conductor | |
| 60. |
The minimum gate current which can turn on SCR is called |
| A. | holding current |
| B. | trigger current |
| C. | break over current |
| D. | junction |
| Answer» C. break over current | |
| 61. |
If a 1 MHz carrier is amplitude modulated with a 5 kHz audio signal, the upper-side frequency is ________ kHz. |
| A. | 1005 |
| B. | 1000 |
| C. | 995 |
| D. | none of the above |
| Answer» B. 1000 | |
| 62. |
A phase-locked loop (PLL) is a feedback circuit consisting of a |
| A. | phase detector. |
| B. | low-pass filter. |
| C. | VCO. |
| D. | all of the above |
| Answer» E. | |
| 63. |
What is the full form of VCO in Communications ? |
| A. | Visually-Controlled Organization |
| B. | Voltage-Controlled Oscillator |
| C. | Voltage-Centered Oscilloscope |
| D. | - |
| Answer» C. Voltage-Centered Oscilloscope | |
| 64. |
Amplitude modulation is a ________ process. |
| A. | multiplication |
| B. | division |
| C. | sum/difference |
| D. | - |
| Answer» B. division | |
| 65. |
The output spectrum of a ________ modulator includes upper-side and lower-side frequencies and the carrier frequency. |
| A. | balanced |
| B. | standard amplitude |
| C. | none of the above |
| D. | - |
| Answer» C. none of the above | |
| 66. |
For a four-quadrant linear multiplier, what is the output voltage, given input voltages of V x = +2 V and V y = –10 V? |
| A. | +2 V |
| B. | +1 V |
| C. | –2 V |
| D. | –1 V |
| Answer» D. –1 V | |
| 67. |
In AM, the carrier is changed by a modulating signal. What parameter of the carrier is changed? |
| A. | amplitude |
| B. | frequency |
| C. | pulse width |
| D. | phase |
| Answer» B. frequency | |
| 68. |
Light may be propagated along a fiber-optic cable in which of the following modes? |
| A. | multimode step index |
| B. | single-mode step index |
| C. | multimode graded index |
| D. | all of the above |
| Answer» E. | |
| 69. |
In order for a light ray to propagate along a fiber-optic cable, what must the relationship be between the angle of incidence and the critical angle? |
| A. | ? i > ? c |
| B. | ? i < ? c |
| C. | ? i = ? c |
| D. | none of the above |
| Answer» B. ? i < ? c | |
| 70. |
The intermediate frequency in a standard AM receiver is |
| A. | 455 Hz. |
| B. | 455 kHz. |
| C. | 4.55 MHz. |
| D. | none of the above |
| Answer» C. 4.55 MHz. | |
| 71. |
An AM demodulator can be implemented with a linear multiplier followed by a ________ filter. |
| A. | low-pass |
| B. | high-pass |
| C. | band-pass |
| D. | band-stop |
| Answer» B. high-pass | |
| 72. |
A certain fiber-optic cable has the following characteristics: n 1 = 1.82 and n 2 = 1.73. What is the value of ? c ? |
| A. | 71.90º |
| B. | 0.95º |
| C. | 18.1º |
| D. | 1.81º |
| Answer» B. 0.95º | |