MCQOPTIONS
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MCQOPTIONS
This section includes 72 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. |
__In amplitude modulation, bandwidth is ___________ the audio signal frequency__ |
| A. | Thrice |
| B. | Four times |
| C. | Twice |
| D. | None of the above |
| Answer» D. None of the above | |
| 52. |
__In an AM wave, the majority of the power is in _____________ |
| A. | Lower sideband |
| B. | Upper sideband |
| C. | Carrier |
| D. | None of the above |
| Answer» D. None of the above | |
| 53. |
__The function of ferrite antenna is to _____________ |
| A. | Reduce stray capacitance |
| B. | Stabilise d.c. bias |
| C. | Increase the Q of tuned circuit |
| D. | Reduce noise |
| Answer» D. Reduce noise | |
| 54. |
__In an AM wave useful power is carrier by _____________ |
| A. | Carrier |
| B. | Sidebands |
| C. | Both sidebands and carrier |
| D. | None of the above |
| Answer» C. Both sidebands and carrier | |
| 55. |
__The letters AVC stand for _____________ |
| A. | Audio voltage control |
| B. | Abrupt voltage control |
| C. | Automatic volume control |
| D. | Automatic voltage control |
| Answer» D. Automatic voltage control | |
| 56. |
_Demodulation is done in ___________$? |
| A. | Receiving antenna |
| B. | Transmitter |
| C. | Radio receiver |
| D. | Transmitting antenna |
| Answer» D. Transmitting antenna | |
| 57. |
In a transmitter ___________ oscillator is used$? |
| A. | Hartley |
| B. | RC phase-shift |
| C. | Wien-bridge |
| D. | Crystal |
| Answer» E. | |
| 58. |
In TV transmission, picture signal is ___________ modulated$? |
| A. | Frequency |
| B. | Phase |
| C. | Amplitude |
| D. | None of the above |
| Answer» D. None of the above | |
| 59. |
If a radio receiver amplifies all the signal frequencies equally well, it is said to have high ___________$? |
| A. | Sensitivity |
| B. | Selectivity |
| C. | Distortion |
| D. | Fidelity |
| Answer» E. | |
| 60. |
The major advantage of FM over AM is ___________$? |
| A. | Reception is less noisy |
| B. | Higher carrier frequency |
| C. | Smaller bandwidth |
| D. | Small frequency deviation |
| Answer» B. Higher carrier frequency | |
| 61. |
The diode detector in an AM radio receiver is usually found ___________$? |
| A. | Before the first RF stage |
| B. | After the first RF stage |
| C. | After several stages of amplification |
| D. | None of the above |
| Answer» D. None of the above | |
| 62. |
When the modulating signal controls the frequency of the carrier, we get___________$? |
| A. | Phase modulation |
| B. | Amplitude modulation |
| C. | Frequency modulation |
| D. | May be any one of the above |
| Answer» D. May be any one of the above | |
| 63. |
Overmodulation results in ___________$? |
| A. | Weakening of the signal |
| B. | Excessive carrier power |
| C. | Distortion |
| D. | None of the above |
| Answer» D. None of the above | |
| 64. |
Modulation is done in ___________? |
| A. | Transmitter |
| B. | Radio receiver |
| C. | Between transmitter and radio receiver |
| D. | None of the above |
| Answer» B. Radio receiver | |
| 65. |
At 100% modulation, the power in each sideband is ___________ of that of carrier |
| A. | 50% |
| B. | 40% |
| C. | 60% |
| D. | 25% |
| Answer» E. | |
| 66. |
Man made noise are ___________ variations. |
| A. | Amplitude |
| B. | Frequency |
| C. | Phase |
| D. | Both phase and frequency |
| Answer» B. Frequency | |
| 67. |
A high Q tuned circuit will permit an amplifier to have high ___________ |
| A. | Fidelity |
| B. | Frequency range |
| C. | Sensitivity |
| D. | Selectivity |
| Answer» E. | |
| 68. |
A 50 kW carrier is to be amplitude modulated to a level of 85%. What is the carrier power after modulation? |
| A. | 50 kW |
| B. | 5 kW |
| C. | 8 kW |
| D. | 25 kW |
| Answer» B. 5 kW | |
| 69. |
In a radio receiver, noise is generally developed at ___________ |
| A. | IF stage |
| B. | Receiving antenna |
| C. | Audio stage |
| D. | RF stage |
| Answer» E. | |
| 70. |
In India, ___________ modulation is used for radio transmission |
| A. | Frequency |
| B. | Amplitude |
| C. | Phase |
| D. | None of the above |
| Answer» C. Phase | |
| 71. |
In superhetrodyne receiver, the input at mixer stage is ___________ |
| A. | IF and RF |
| B. | RF and AF |
| C. | IF and AF |
| D. | RF and local oscillator signal |
| Answer» E. | |
| 72. |
In a superhetrodyne receiver, the difference frequency is chosen as the IF rather than the sum frequency because ___________ |
| A. | The difference frequency is closer to oscillator frequency |
| B. | Lower frequencies are easier to amplify |
| C. | Only the difference frequency can be modulated |
| D. | None of the above |
| Answer» C. Only the difference frequency can be modulated | |