Q. If k denotes Boltzmann's constant, the rms value of thermal noise voltage is proportional to

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Q. The output of a battery eliminator is about

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Q. TV receivers use flyback switched mode power supply because

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Q. SSB stands for

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Q. Assertion (A): In SSB, carrier is suppressed by about 45 dB

Reason (R): SSB is standard form for radio communication

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Q. For a parallel two wire line with both conductors touching each other, the characteristic impedance is about

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Q. Tape recorders use

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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

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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.

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Q. In TV broadcast, UHF range is

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

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

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Q. The sampling frequency in CD is 10 kHz.

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Q. Vestigial sideband is most commonly used in

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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

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

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

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Q. The main advantage of superheterodyne receiver is

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Q. PAL system was proposed first in

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Q. MCVF telegraphy causes

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