Q. The depth of modulation is doubled in FM system then, the power transmitted

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Q. Ground wave can be used for communication upto

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Q. A Marconi antenna

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Q. When large amount of power is required, a push pull amplifier is designed for operation as

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Q. Why does a FM radio station perform better than and AM station radiating the same actual power?

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Q. In cable TV local programmes can be telecast at any frequency.

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Q. In amplitude modulation, the magnitude of side bands is

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Q. If fs be the signal frequency and fi be the intermediate frequency then image frequency is given by

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Q. In VHS format the width of tape is

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Q. The minimum viewing angle of resolution of human eye is (D is iris opening and λ is wavelength of light)

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Q. In FM,

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Q. The power density spectrum of noise voltage of resistor R can be expressed as

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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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