Q. Which of the following microphones has lowest output impedance?

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Q. High frequency waves are

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Q. During fast forward operation of a tape recorder

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Q. Homodyne detection means

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Q. A radio station works at 800 kHz and uses AM. If this is a public broadcast system, it should transmit using

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Q. In a superheterodyne broadcast receiver, the frequency of local oscillator is __________ the incoming signal frequency.

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Q. PAL stands for

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Q. In free space, line of sight propagation case, the transmission losses between transmitter and receiver increase with frequency (f) as

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Q. PCM : Quantising Noise :: Transistor :

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Q. For a given data rate, the bandwidth βp of a BPSK signal and the bandwidth β₀ of the OOK signal are related as

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Q. A direct radiating cone type loudspeaker attenuates :

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Q. The advantage of pulse modulation is

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Q. Sparking affects amplitude modulation.

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Q. For low impedance SAW filter the most suitable material for substrate of SAW filter is

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Q. An angle modulated signal is expressed by fa(t) = cos (2 x 10⁸ πt) + 75 sin (2 x 10³ πt). The peak frequency deviation of the carrier is

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Q. The amplitude of a modulated RF aerial current is 6 A on the peaks of modulation and 4 A on the troughs of modulation. The value of carrier amplitude is

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Q. In practical commercial AM system channel bandwidth is

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Q. The currents fed to the two dipoles of turnstile antenna are

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Q. Armstrong modulator generates

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Q. The diagonal clipping in Amplitude Demodulation using (envelope detector) can be avoided if Rc time constant of the envelope detector satisfies the following condition here ω is message bandwidth and ωc is carrier frequency both in rad sec,

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