MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
__DVD uses__ |
| A. | Laser beam for both recording and playback |
| B. | Laser beam for recording and video head for playback |
| C. | Video head for recording and laser beam for playback |
| D. | None of the above |
| Answer» B. Laser beam for recording and video head for playback | |
| 2. |
_Which of the following is used to generate PDM?$? |
| A. | Free running multi-vibrator |
| B. | Monostable multi-vibrator |
| C. | JK flip-flop |
| D. | Schmitt trigger |
| Answer» C. JK flip-flop | |
| 3. |
_PAM stands for$? |
| A. | Pulse Analogue Modulation |
| B. | Phase Analogue Modulation |
| C. | Pulse Amplitude Modulation |
| D. | Phase Amplitude Modulation |
| Answer» D. Phase Amplitude Modulation | |
| 4. |
_FM transmitting and receiving equipment as compared to AM equipment is$? |
| A. | Costly |
| B. | Cheaper |
| C. | Almost equally costly |
| D. | None of the above |
| Answer» B. Cheaper | |
| 5. |
_DVD uses$? |
| A. | Laser beam for both recording and playback |
| B. | Laser beam for recording and video head for playback |
| C. | Video head for recording and laser beam for playback |
| D. | None of the above |
| Answer» B. Laser beam for recording and video head for playback | |
| 6. |
_The characteristic impedance of a twin wire feeder used for TV signals is about$? |
| A. | 1000 ohm |
| B. | 500 ohm |
| C. | 300 ohm |
| D. | 100 ohm |
| Answer» D. 100 ohm | |
| 7. |
_If sampling is done at the rate of 10 kHz. The bandwidth required is$? |
| A. | 35 kHz |
| B. | 70 kHz |
| C. | 10 kHz |
| D. | 1280 kHz |
| Answer» B. 70 kHz | |
| 8. |
_For a given carrier wave, maximum undistorted power is transmitted when value of modulation is$? |
| A. | 1 |
| B. | 0.8 |
| C. | 0.5 |
| D. | 0 |
| Answer» B. 0.8 | |
| 9. |
_Which one of the following is analog?$? |
| A. | PCM |
| B. | PWM |
| C. | Delta modulation |
| D. | Differential PCM |
| Answer» C. Delta modulation | |
| 10. |
_If in a broadcasting studio, a 1000 kHz carrier is modulated by an audio signal of frequency range 100-5000 kHz, the width of channel is __________ kHz.$? |
| A. | 5 |
| B. | 4.9 |
| C. | 995 |
| D. | 10 |
| Answer» E. | |
| 11. |
VSB modulation is preferred in TV because$? |
| A. | It reduces the bandwidth requirement to half |
| B. | It avoids phase distortion at low frequencies |
| C. | It results in better reception |
| D. | None of the above |
| Answer» B. It avoids phase distortion at low frequencies | |
| 12. |
Circular polarization$? |
| A. | Is useful in reducing depolarization effect on received wave |
| B. | Involves critical alignment of transmitting and receiving antenna |
| C. | Is useful in discrimination between reception of adjacent beams |
| D. | None of the above |
| Answer» B. Involves critical alignment of transmitting and receiving antenna | |
| 13. |
Leak type bias is used in plate modulated class C amplifier to$? |
| A. | Increase the bandwidth |
| B. | Prevent over modulation |
| C. | Prevent excessive grid current |
| D. | Prevent tuned circuit damping |
| Answer» D. Prevent tuned circuit damping | |
| 14. |
An audio signal (say from 50 Hz to 10000 Hz) is frequency translated by a carrier having a frequency of 106 Hz. The values of initial (without frequency translation) and final (after frequency translation) fractional change in frequency from one band edge to the other are$? |
| A. | 200 and 1.01 |
| B. | 200 and 10.01 |
| C. | 200 and 100.1 |
| D. | 200 and 200 |
| Answer» B. 200 and 10.01 | |
| 15. |
In TV systems, equalising pulses are sent during$? |
| A. | Horizontal blanking |
| B. | Vertical blanking |
| C. | Serrations |
| D. | Horizontal retrace |
| Answer» B. Vertical blanking | |
| 16. |
Assertion (A): In FM the frequency of the carrier is varied by the modulating voltageReason (R): FM and PM are two forms of angle modulation.$? |
| A. | Both A and R are correct and R is correct explanation of A |
| B. | Both A and R are correct but R is not correct explanation of A |
| C. | A is correct but R is wrong |
| D. | A is wrong but R is correct |
| Answer» C. A is correct but R is wrong | |
| 17. |
Under ordinary circumstances, impulse noise can be reduced in$? |
| A. | FM only |
| B. | AM only |
| C. | Both AM and FM |
| D. | None of the above |
| Answer» B. AM only | |
| 18. |
A woofer should be fed from the input through a$? |
| A. | Low pass filter |
| B. | High pass filter |
| C. | Band pass filter |
| D. | Band stop filter |
| Answer» B. High pass filter | |
| 19. |
Fourier analysis indicate that a square wave can be represented as$? |
| A. | A fundamental sine wave and odd harmonics |
| B. | A fundamental sine wave and even harmonics |
| C. | A fundamental sine wave and harmonics |
| D. | Fundamental and subharmonic sine waves |
| Answer» B. A fundamental sine wave and even harmonics | |
| 20. |
Under ordinary circumstances, impulse noise can be reduced in? |
| A. | FM only |
| B. | AM only |
| C. | Both AM and FM |
| D. | None of the above |
| Answer» B. AM only | |
| 21. |
Assertion (A): In FM the frequency of the carrier is varied by the modulating voltageReason (R): FM and PM are two forms of angle modulation.? |
| A. | Both A and R are correct and R is correct explanation of A |
| B. | Both A and R are correct but R is not correct explanation of A |
| C. | A is correct but R is wrong |
| D. | A is wrong but R is correct |
| Answer» C. A is correct but R is wrong | |
| 22. |
Leak type bias is used in plate modulated class C amplifier to? |
| A. | Increase the bandwidth |
| B. | Prevent over modulation |
| C. | Prevent excessive grid current |
| D. | Prevent tuned circuit damping |
| Answer» D. Prevent tuned circuit damping | |
| 23. |
An audio signal (say from 50 Hz to 10000 Hz) is frequency translated by a carrier having a frequency of 106 Hz. The values of initial (without frequency translation) and final (after frequency translation) fractional change in frequency from one band edge to the other are? |
| A. | 200 and 1.01 |
| B. | 200 and 10.01 |
| C. | 200 and 100.1 |
| D. | 200 and 200 |
| Answer» B. 200 and 10.01 | |
| 24. |
A woofer should be fed from the input through a? |
| A. | Low pass filter |
| B. | High pass filter |
| C. | Band pass filter |
| D. | Band stop filter |
| Answer» B. High pass filter | |
| 25. |
Fourier analysis indicate that a square wave can be represented as? |
| A. | A fundamental sine wave and odd harmonics |
| B. | A fundamental sine wave and even harmonics |
| C. | A fundamental sine wave and harmonics |
| D. | Fundamental and subharmonic sine waves |
| Answer» B. A fundamental sine wave and even harmonics | |
| 26. |
In TV systems, equalising pulses are sent during? |
| A. | Horizontal blanking |
| B. | Vertical blanking |
| C. | Serrations |
| D. | Horizontal retrace |
| Answer» B. Vertical blanking | |
| 27. |
VSB modulation is preferred in TV because? |
| A. | It reduces the bandwidth requirement to half |
| B. | It avoids phase distortion at low frequencies |
| C. | It results in better reception |
| D. | None of the above |
| Answer» B. It avoids phase distortion at low frequencies | |
| 28. |
Circular polarization? |
| A. | Is useful in reducing depolarization effect on received wave |
| B. | Involves critical alignment of transmitting and receiving antenna |
| C. | Is useful in discrimination between reception of adjacent beams |
| D. | None of the above |
| Answer» B. Involves critical alignment of transmitting and receiving antenna | |