31. Which of the following operating frequencies is used for the modern loran navigational system? A. Loran C: 100 kHz B. Loran D: 10.2 kHz C. Loran A: 1950 kHz D. Loran B: 900 kHz Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
32. The maximum usable range of the usual radar set (on any particular range setting) is determined by A. The width of the transmitted pulses B. The interval between transmitted pulses C. The bandwidth of the receiver IF stages D. The duty cycle Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
33. A Class-S Emergency Position-Indicating Radio Beacon (E.P.I.R.B) A. Must be capable of floating or being secured to a survival B. Must have its battery replaced after emergency use C. May be tested during the first five minutes of any hour D. All of these Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
34. A thin layer of dirt and grime coverts the reflecting surface of the parabolic dish of a radar set. The particular effect on the performance of the radar will be A. A decrease in range B. A reduction in horizontal resolution C. No noticeable effect D. A decrease in gain Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
35. Which of the reception problems below that is not due to multipath? A. Delayed spreading B. Rayleigh fading C. Random Doppler shift D. Slow fading Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
36. A traveling-wave tube (TWT) amplifies by virtue of A. The absorption of energy by the signal from an electron stream B. The effect of an external magnetic field C. The energy contained the cavity resonators D. The energy liberated form the collector Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
37. Calculate the effective earth’s radius if the surface refractivity is 301. A. 8493 km B. 8493 mmi C. 6370 km D. 6370 mi Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
38. In an SHF pulsed radar set, a reflex klystron can be used as a A. Single mixer stage B. Local oscillator C. Transmitter oscillator D. Duplexer stage Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
39. To achieve good bearing resolution when using a pulsed-radar set, an important requirement is A. A narrow, antenna-beam width in the vertical plane B. A narrow, antenna-beam width in the horizontal plane C. A low repetition rate D. A high duty cycle Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
40. The highest frequency which a conventional vacuum tube oscillator can generate is not limited by the A. Electron transit time B. Distributed lead inductance C. Inter-electrode capacitance D. Degree of emission from the cathode Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
