78151. In a radio receiver, the local oscillator is always tuned to a frequency higher than the incoming frequency to
78152. 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
78153. 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
78154. In a superheterodyne receiver, the IF stage has better selectivity than RF stage because
78155. 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
78156. The purpose of incorporating a pre-selector stage in a receiver is to
78157. Vividh Bharati programme is transmitted in
78158. The thread angle of National fine thread is:
78159. In a receiver, which of the following device has RF input but IF output?
78160. The IF stage of a receiver employs
78161. 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
78162. Double spotting in a receiver is due to
78163. Three point tracking can be achieved with
78164. In a transistor receiver, the use of FET as the first stage amplifier is likely to
78165. The household radio receiver uses
78166. The source of which of the following noise is different from that of the remaining?
78167. A receiver having poor IF selectivity will also have poor
78168. Statement 1Diode is the most common device used for demodulation.Statement 2A discriminator is a FM detector.
78169. The selectivity curve of a standard receiver is represented by
78170. Which of the following statement about the advantage of phase discriminator over the slope detector is false?
78171. Fidelity of a receiver represents
78172. Which of the following produces upper and lower side frequencies?
78173. The passband of the tuned circuits of a radio receiver should be equal to
78174. 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. In receivers operating upto the limit of shortwave broadcasting the local oscillator often used is
78175. Select the ‘pitch’ of a medium hacksaw blade from the following:
78176. In an FM signal, the power
78177. 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 efficiency of detection is
78178. Selectivity varies with receiving frequency, frequency is raised.
78179. FM receivers using the standard 88 to 108 MHz band use IF of
78180. Most of the amplification of the received signal is obtained in a superheterodyne receiver from the
78181. The problem associated with tuned-radio frequency receiver is
78182. Refrigerator compressor motor winding burnt out:
78183. Superheterodyne receiver can be used in
78184. In a receiver, at higher frequencies
78185. Which of the following circuit cannot be used to demodulate SSB?
78186. High IF in a superheat receiver
78187. Which of the following is not a desirable property of a good insulating material?
78188. A communication channel with additive white Gaussian noise, has a bandwidth of 4 kHz and an SNR of 15. Its channel capacity is
78189. Compressor used in window A/c is:
78190. In a superheterodyne receiver
78191. The function of an AM detector circuit is to
78192. Which of the following should be used in order to prevent overloading or the last IF amplifier in a receiver?
78193. Most popular IF for receivers tuning to 540 to 1650 kHz is
78194. How many operations are in service valve?
78195. The most possible leakage spots in the refrigerator is:
78196. One Kilowat is equal to:
78197. It is an instrument used to measure high temperature:
78198. The operation of split A/c produces:
78199. The discussing sharing of a communication satellite by many geographically dispersed Earth station, DAMA means
78200. The angle subtended by earth at geostationary communication satellite is
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