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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 ? 
Directions : In each of the following questions a statement is given, followed by two conclusions. Give answer :

Statement : Of all the radio sets manufactured in India, the 'X' brand has the largest sale.

Assumptions :
I. The sale of all the radio sets manufactured in India is known.
II. The manufacturing of no other radio set in India is as large as 'X' brand radio.
If the transmission co-efficient T₁ of a transmission line is 1.333 and the characteristic impedance of the λ/4 transmission line used is 100Ω, then the characteristic impedance of the transmission line is:
Consider the following: 1. Pulse-position modulation. 2. Pulse-code modulation. 3. Pulse-width modulation. Which of the above communications are not digital?
A frequency division multiplexing system is used to multiplex 24 independent voice signals. Single sideband modulation is used for the transmission. Each voice signal is allotted a bandwidth of 4 kHz. What is the overall transmission bandwidth of the channel ?
In radio transmission, the medium of transmission is ___________
Why does the ionosphere of the Earth's atmosphere facilitate radio communication? i. The presence of ozone causes the reflection of radio waves to earth ii. Radio waves have a very long wavelength
A layer in the Earth's atmosphere called Ionosphere facilitates radio communication. Why? 1. The presence of ozone cause the reflection of radio waves to Earth. 2. Radio waves have a very long wavelength. Which of the statements given above is/are correct?
Ram goes to electronic shop to buy a T.V. and Radio. He bargains for a 10% discount on the Radio and 25% discount on T.V. However, the shopkeeper, by mistake, interchanged the discount percentage figures while making the bill and Ram paid accordingly. When compared to what he should have paid for his purchase he pay extra, what percentage did Ram pay extra if given that the Radio costs 40% as much as the T.V.