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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 ? 
The Vestigial Side Band (VSB) modulation is preferred in TV systems because 1. It reduces the bandwidth requirement to half 2. It avoids phase distortion at low frequencies Which of the above statements is/are correct?
VSB modulation is used in televisions because it avoids phase distortion at low frequencies.
VSB modulation is used in televisions because it results in better reception.
The color preferences of a group of girls were mapped and the results were as follows: 20 preferred pink, 16 preferred red and 14 preferred green. 5 preferred all the three colours. 9 of them chose Pink and Green. 7 of them chose Pink and Red. 8 of them chose Red and Green. How many girls chose only one colour?
Base modulation is preferred over collector modulation of a class C transistor because of its better efficiency.
Base modulation is preferred over collector modulation of a class C transistor because it has high power output per transistor.
Consider the following: 1. Pulse-position modulation. 2. Pulse-code modulation. 3. Pulse-width modulation. Which of the above communications are not digital?
In the survey among girls at IIT Delhi, it was found that 46% preferred coffee and 15% preferred smoking. Also, 44% did not preferred coffee or smoking. If 55 girls like both coffee and smoking, then, find the total number of girls who participated in survey?