201. If transmitted power is 75 kW, the field strength at 30 km distance will be about
202. In the television system in India, each frame is scanned
203. Each kilometer of travel in electromagnetic radiation means a time delay of
204. A video monitor is exactly similar to TV receiver.
205. A RADAR can be used to
206. In single tone AM modulation, the transmission efficiency for m = 1 is
207. AM amplifier having noise figure of 20 dB and available power gain of 15 dB is followed by a mixer circuit having noise figure of 9 dB. The overall noise figure as referred to input in dB is
208. Which one of the following is non-resonant antenna?
209. The efficiency of using a binary system for selection of 1 out of 13 equally probable events is
210. The most suitable method for detecting a modulated signal g(t) = (3 to 6 cos 2p fmt) cos 2p fct is
211. The time required for horizontal blanking is 16% of that for each horizontal line. If horizontal time is 63.5 μs, the horizontal blanking time for each line is about
212. When the number of quantising levels is 16 in PCM, the number of pulses in a code group will be
213. A message signal with bandwidth 10 kHz is lower sideband SSB modulated with carrier frequency fc1 = 106 Hz. The resulting signal is then passed though a narrow band frequency modulator with carrier frequency fc2 = 109 Hz. The bandwidth of the output would be
214. In a PCM system, if the code word length is increased from 6 to 8 bits, the signal to quantization noise ratio improves by the factor.
215. For 10 bit PCM system, the signal to quantization noise ratio is 62 dB. If the number of bits is increased by 2, then the signal to quantization noise ratio will
216. The video heads, in VCR, feed the other circuit
217. A high pulse repetition frequency in a radar
218. In PCM, the biggest disadvantage as compared to AM is
219. Which of the following microphones is the cheapest?
220. If a line is terminated in characteristic impedance Z0, the input impedance measured at the input will be
221. In a TV, the output from RF tuner is about
222. 24 telephone channels, each band limited to 3.4 kHz, are to be time division multiplexed by using PCM, calculate the bandwidth of PCM system for 128 quantization levels and an 8 KHz sampling frequency
223. A signal is sampled at 8 kHz and is quantized using 8 bit uniform quantizer. Assuming SNRq for a sinusoidal signal, the correct statement for PCM signal with a bit rate of R is
224. Generally a VCR has
225. A remote control of TV uses a 10 bit word. The maximum number of total commands it can transmit is