Q. An FM signal is modulated by an 8 kHz sine wave and has maximum and minimum frequencies of 100.05 MHz and 99.95 MHz respectively. Its deviation frequency is

View solution

Q. Assertion (A): RF tuner is called front end of TV receiver

Reason (R): RF tuner receives the TV signal and selects the required channel.

View solution

Q. In TV broadcast, UHF range is

View solution

Q. The most commonly used microphone for public address systems is

View solution

Q. Pre-emphasis and De-emphasis is done by using R-C circuit.

View solution

Q. The sampling frequency in CD is 10 kHz.

View solution

Q. Vestigial sideband is most commonly used in

View solution

Q. An image uses 512 x 512 picture elements. Each element can take any of eight distinguishable levels. The maximum entropy in the above image will be

View solution

Q. The subcarrier frequency for transmission of colour difference signals in TV systems in India is

View solution

Q. A helical antenna is used for satellite tracking due to its

View solution

Q. The main advantage of superheterodyne receiver is

View solution

Q. PAL system was proposed first in

View solution

Q. MCVF telegraphy causes

View solution

Q. Consider the following statements as regards noise

1. If Gaussian noise is applied at input of a rectifier, the output is not gaussian
2. The noise encountered on a telephone line consists of short, pulse type disturbances whose amplitude distribution is not Gaussian
3. Shot noise results from random emission of electrons from a cathode
4. Shot noise results from phenomenon associated with the flow of current across semi conductor junctions

Which of the above are correct?

View solution

Q. Noise can be reduced by increasing sampling rate

View solution

Q. Which of the following is invariably found in SSB?

View solution

Q. In the spectrum of a frequency modulated wave

View solution

Q. Which of the following pulse communication system is inherently immune to noise?

View solution

Q. In a PCM system, if we increase the quantization levels from 2 to 8, how do the relative bandwidth requirements vary?

View solution

Q. If the target area is small compared to wavelength of radar the situation is called

View solution