Assignment Questions

Neets Module 18-Radar Principles
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10 2-19. In order that nearby targets may be detected, which of the following characteristics must the transmitted pulse have? 1. A steep leading edge 2. A steep trailing edge 3. A sloping leading edge 4. A sloping trailing edge 2-20. Compared to the hard-tube modulator, the line-pulsing modulator has which of the following advantages? 1. It is more complex 2. It is more efficient 3. It is more sensitive to voltage changes 4. It requires a higher power-supply voltage 2-21. The modulator of a radar basically consists of a power supply, a switch, a storage element, and a/an 1. IF strip 2. oscillator 3. transmitter 4. charging impedance 2-22. Which of the following devices can be used as the storage element in a radar modulator? 1. A capacitor 2. A pulse-forming network 3. An artificial transmission line 4. Each of the above 2-23. A signal introduced at the input end of an artificial transmission line moves through the circuit to the output end and is reflected back to the input. The output end of an artificial transmission line appears to the input signal as what type of circuit? 1. Open 2. Short 3. Inductive reactance 4. Capacitive reactance 2-24. The discharge pulse from the artificial transmission line causes a voltage of what magnitude to appear across the primary of the pulse transformer? 1. Twice the original charge voltage 2. One-half the original charge voltage 3. The same as the original charge voltage 4. One-fourth the original charge voltage 2-25. What parameter, if any, of the output pulse from an artificial transmission line is affected by the inductance and capacitance of each section of the line? 1. Width 2. Amplitude 3. Frequency 4. None of the above 2-26. A pulse-forming network exhibits electrical behavior similar to which of the following devices? 1. A resistance-capacitance network 2. An artificial transmission line 3. A capacitor 4. An inductor 2-27. The requirements of a modulator switch are to (1) reach full conduction quickly, (2) consume low power, (3) start and stop conduction suddenly, and (4) conduct high currents and handle high voltages. Which of the following tubes meets these requirements? 1. A tetrode 2. A thyratron 3. A magnetron 4. A beam-powered amplifier

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