21. 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 & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
22. 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 & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
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 & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
24. 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 & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
25. 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 & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
26. In a radio receiver, noise is generally developed at ___________ A. IF stage B. Receiving antenna C. Audio stage D. RF stage Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
27. 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 & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
28. 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 & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
29. If Amin = 40 and Amax = 60, what is the percentage of modulation? A. 20% B. 40% C. 50% D. 10% Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
30. 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 & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board