64751. In a radio receiver, if the intermediate frequency is too high
64752. In a superheterodyne receiver, the IF is 455 kHz. If it is tuned to 1200 kHz, the image frequency will be
64753. The selectivity of most receivers is determined largely by
64754. In a superheterodyne receiver with an IF of 450 kHz is tuned to a signal at 1200 kHz. The image frequency is
64755. In a broadcast superheterodynes receiver having no RF amplifier, the loaded Q of the antenna coupling circuit is 100. If the intermediate frequency is 455 kHz. The rejection ratio at 25 MHz will be
64756. As compared to tuned radio frequency receivers which of the following is the advantage of using superheterodyne receivers?
64757. In a radio receiver, if the intermediate frequency is too low
64758. FM amplifier in a superheterodyne receiver
64759. Padders are used in a receiver to
64760. In a radio receiver, the local oscillator is tuned to a frequency
64761. Which of the following oscillator is generally not used at VHF?
64762. An unmodulated voltage 10 V effective is applied to a dioxide detector in which load resistance is 4 x 10-5 ohms. A micrometer shows that the rectified DC current in this resistance is 30 A. The input resistance of the detector is
64763. The output of a diode detector contains
64764. Which of the following noise does not occur in transistors?
64765. Noise generated in a resistor is also known as
64766. Which of the following is used to provide tracking between RF amplifier and local oscillator stages of receiver?
64767. The selectivity of a radio receiver is
64768. If the intermediate frequency of a superheterodyne receiver falls within the tuning range of the receiver
64769. EM 84 tube is used in radio receivers as
64770. Which of the following statement about receivers is false?
64771. Modulated carrier power in FM
64772. In superheterodyne receivers, the local oscillator is used to
64773. Which of the following is same in AM and FM receivers?
64774. A notch filter is sometimes used in communication receivers to
64775. Which one of the following is not a useful quantity for comparing the noise performance of receivers?
64776. Which of the following statement about the amplitude limiter is not valid?
64777. Noise limiter is provided on AM receivers to
64778. A low ratio of the A.C. load impedance of a diode detector results in
64779. A trimmer is basically a
64780. In a radio receiver
64781. Which curve represents the fidelity curve of a standard receiver?
64782. The sensitivity of a superheterodyne receiver is determined by
64783. The closing of churner and top cover done air tight by:
64784. In radio receiver, the maximum contribution to noise is from
64785. Power spectral density of white noise
64786. In a FM waveform, the side bands are spaced at intervals equal to
64787. A receiver having an RF amplifier and an IF of 450 kHz, has Q of the coils 65 and an incoming frequency of 1200 kHz. The image rejection of the receiver is
64788. A padder is basically a/an
64789. In a radio receiver, the local oscillator is always tuned to a frequency higher than the incoming frequency to
64790. When a superheterodyne receiver is tuned to 455 kHz, its local oscillator provides a mixer with the input at 1010 kHz. The image frequency is
64791. In a broadcast superheterodynes receiver having no RF amplifier, the loaded Q of the antenna coupling circuit is 100. If the intermediate frequency is 455 kHz. The image frequency at 1000 kHz will be
64792. In a superheterodyne receiver, the IF stage has better selectivity than RF stage because
64793. An arbitrary signal m (t) has zero average value and it is bandlimited to 3.2 kHz. It is sampled at the rate of 8 K samples/S. The samples are passed through an ideal bandpass filter with centre frequency of 32 kHz and bandwidth of 6.4 kHz. The output of band pass filter is
64794. The purpose of incorporating a pre-selector stage in a receiver is to
64795. Vividh Bharati programme is transmitted in
64796. The thread angle of National fine thread is:
64797. In a receiver, which of the following device has RF input but IF output?
64798. The IF stage of a receiver employs
64799. A FM signal with modulation index Mf is passed through a frequency doubler. The wave in the output of the doubler will have modulation index of