MCQOPTIONS
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MCQOPTIONS
This section includes 37 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
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 | |
| 2. |
The superhetrodyne principle provides selectivity at ______________stage? |
| A. | RF |
| B. | IF |
| C. | audio |
| D. | Before RF |
| Answer» C. audio | |
| 3. |
The signal voltage induced in the aerial of a radio receiver is of the order of_____________? |
| A. | mV |
| B. | µV |
| C. | V |
| D. | None of the above |
| Answer» C. V | |
| 4. |
The signal voltage induced in the aerial of a radio receiver is of the order of ________________? |
| A. | mV |
| B. | µV |
| C. | V |
| D. | None of the above |
| Answer» C. V | |
| 5. |
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 | |
| 6. |
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 | |
| 7. |
The IF is 455 kHz. If the radio receiver is tuned to 855 kHz, the local oscillator frequency is _______________? |
| A. | 455 kHz |
| B. | 1310 kHz |
| C. | 1500 kHz |
| D. | 1520 kHz |
| Answer» C. 1500 kHz | |
| 8. |
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 | |
| 9. |
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 | |
| 10. |
Overmodulation (amplitude) occurs when signal amplitude is _____________ carrier amplitude? |
| A. | Equal to |
| B. | Greater than |
| C. | Less than |
| D. | None of the above |
| Answer» C. Less than | |
| 11. |
Over modulation results in ______________? |
| A. | Weakening of the signal |
| B. | Excessive carrier power |
| C. | Distortion |
| D. | None of the above |
| Answer» D. None of the above | |
| 12. |
Most of the amplification in a superhetrodyne receiver occurs at ______________stage? |
| A. | IF |
| B. | RF amplifier |
| C. | Audio amplifier |
| D. | Detector |
| Answer» B. RF amplifier | |
| 13. |
Modulation refers to a low-frequency signal controlling the ________________? |
| A. | Amplitude of the carrier |
| B. | Frequency of the carrier |
| C. | Phase of the carrier |
| D. | May be any of the above |
| Answer» E. | |
| 14. |
Modulation is done in____________________ |
| A. | Transmitter |
| B. | Radio receiver |
| C. | Between transmitter and radio receiver |
| D. | None of the above |
| Answer» B. Radio receiver | |
| 15. |
Man made noise are______________ variations? |
| A. | Amplitude |
| B. | Frequency |
| C. | Phase |
| D. | Both phase and frequency |
| Answer» B. Frequency | |
| 16. |
In TV transmission, sound signal is ______________modulated? |
| A. | Amplitude |
| B. | Frequency |
| C. | Phase |
| D. | None of the above |
| Answer» C. Phase | |
| 17. |
In TV transmission, picture signal is ______________ modulated? |
| A. | Frequency |
| B. | Phase |
| C. | Amplitude |
| D. | None of the above |
| Answer» D. None of the above | |
| 18. |
In the above question, what is the power in sidebands ? |
| A. | 8 kW |
| B. | 6 kW |
| C. | 06 kW |
| D. | 9 kW |
| Answer» D. 9 kW | |
| 19. |
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. | |
| 20. |
In radio transmission, the medium of transmission is ________________? |
| A. | Space |
| B. | An antenna |
| C. | Cable |
| D. | None of the above |
| Answer» B. An antenna | |
| 21. |
In pakistan, ______________ modulation is used for radio transmission? |
| A. | Frequency |
| B. | Amplitude |
| C. | Phase |
| D. | None of the above |
| Answer» C. Phase | |
| 22. |
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 | |
| 23. |
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 | |
| 24. |
In amplitude modulation, the _____________of carrier is varied according to the strength of the signal? |
| A. | Amplitude |
| B. | Frequency |
| C. | Phase |
| D. | None of the above |
| Answer» B. Frequency | |
| 25. |
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 | |
| 26. |
In a TRF radio receiver, the RF and detection stages are tuned to______________? |
| A. | Radio frequency |
| B. | IF |
| C. | Audio frequency |
| D. | None of the above |
| Answer» B. IF | |
| 27. |
In a transmitter ____________oscillator is used? |
| A. | Hartley |
| B. | RC phase-shift |
| C. | Wien-bridge |
| D. | Crystal |
| Answer» E. | |
| 28. |
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 | |
| 29. |
In a radio receiver, we generally use ………….. oscillator as a local oscillator |
| A. | Crystal |
| B. | Wien-bridge |
| C. | Phase-shift |
| D. | Hartley |
| Answer» E. | |
| 30. |
In a radio receiver, noise is generally developed at _______________? |
| A. | IF stage |
| B. | Receiving antenna |
| C. | Audio stage |
| D. | RF stage |
| Answer» E. | |
| 31. |
If modulation is 100% then signal amplitude is ____________arrier amplitude? |
| A. | Equal to |
| B. | Greater than |
| C. | Less than |
| D. | None of the above |
| Answer» B. Greater than | |
| 32. |
If level of modulation is increased ______________ power is increased? |
| A. | Carrier |
| B. | Sideband |
| C. | Carrier as well as sideband |
| D. | None of the above |
| Answer» C. Carrier as well as sideband | |
| 33. |
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. | |
| 34. |
Demodulation is done in ________________? |
| A. | Receiving antenna |
| B. | Transmitter |
| C. | Radio receiver |
| D. | Transmitting antenna |
| Answer» D. Transmitting antenna | |
| 35. |
At 100% modulation, the power in each sideband is _____________ of that of carrier? |
| A. | 50% |
| B. | 40% |
| C. | 60% |
| D. | 25% |
| Answer» E. | |
| 36. |
As the modulation level is increased, the carrier power__________________? |
| A. | Is increased |
| B. | Remains the same |
| C. | Is decreased |
| D. | None of the above |
| Answer» C. Is decreased | |
| 37. |
A high Q tuned circuit will permit an amplifier to have high __________________? |
| A. | Fidelity |
| B. | Frequency range |
| C. | Sensitivity |
| D. | Selectivity |
| Answer» E. | |