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Consider the following types of modulation: 1. Amplitude modulation 2. Frequency modulation 3. Phase modulation 4. Pulse modulation Which of the above modulation are used for telecasting TV programs?
Consider the following statements regarding modulation : 1. The communication systems, where a weak signal is transmitted by the use of a modulation is essential in carrier signal. 2. When the frequency of the high frequency signal is varied in accordance with the intensity of the low-frequency weak signal, the modulation is said to be frequency modulation. 3. The process of recovering original baseband signal from the modulated signal is called phase modulation. Which of the above statements are correct ? 
Most commonly used modulation system for telegraphy is ________
For telegraphy pulse code modulation (PCM) is widely used.
Consider the following: 1. Pulse-position modulation. 2. Pulse-code modulation. 3. Pulse-width modulation. Which of the above communications are not digital?
When was Morse system for telegraphy first used?
Which of the following modulation system is used for video-modulation?
In telegraphy we generally use __________
Which element promoted the industrialization of wireless telegraphy?
Wireless telegraphy was developed by