Q. Consider the following

1. Generation of SSB signals
2. Design of minimum phase type filters
3. Representation of band pass signals

Which of the above applications is Hilbert transform used?

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Q. The dc voltage on plate modulated class C amplifier is 8 kV. If the peak modulating voltage is 4 kV, the peak RF voltage delivered to load is

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Q. The minimum step size required for a Delta modulator operating at 36 samples/sec to track the signal (here u(t) is the unit step function) x(t) = 125t (u(t) - u(t - 1)) + (250 - 125t) (u(t - 1) - u(t - 2)) So that slope overload is avoided, would be

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Q. An FM signal with a deviation δ is passed through a mixer, and has its frequency reduced 5 fold. The deviation in the output of the mixer is

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Q. In PCM, if the number of quantization levels is increased from 4 to 64, then the bandwidth requirement will approximately be increased __________ times.

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Q. A tweeter should be fed from the input through a

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Q. The modulation index is, if fm = 500 Hz, Δf = 2.25 kHz

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Q. Which of the following is true in a tape recorder?

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Q. In a high speed modem the data rate handled is about

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Q. Trinitron is a monochrome picture tube.

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Q. The first pulse in a TV remote control is

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Q. If the ratio of ac to dc load impedance of a diode detector is low, the result will be

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Q. If D is mouth diameter of a paraboloid reflector, its directivity is proportional to

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Q. A noiseless 3 kHz channel can't transmit binary bit at the rate

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Q. In an AM wave the carrier and one of the side bands is suppressed. If m = 1, the percentage saving in power is

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Q. Assertion (A): An electronic tuner uses varactor diode

Reason (R): The capacitance of a varactor diode depends on the magnitude of reverse bias.

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Q. A superheterodyne receiver is to operate in the frequency range 550 kHz - 1650 kHz, with the intermediate frequency of 450 kHz. Let R = Cmin/Cmax denote the required capacitance ratio of the local oscillator and I denote the image frequency (in kHz) of the incoming signal. If the receiver is tuned to 700 kHz, then

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Q. In a tape recorder the output from RF oscillator is given to

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Q. A + 1.9 lens has a focal length of 25 mm. The diameter of lens is about

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Q. Which of the following terms are applicable to troposcatter propagation?

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