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Assignment Questions - 14183_187
Assignment Questions - 14183_189

Neets Module 11-Microwave Principles
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12 2-29.   In a twt, what is the purpose of the attenuators along the helix? 1.   To focus the beam 2.   To limit the input 3.   To limit the output 4.   To prevent reflections 2-30.   A microwave tube that extracts energy from a wave that travels from the collector toward the cathode is referred to as the 1.   klystron 2.   traveling-wave tube 3.   crossed-field amplifier 4.   backward-wave oscillator 2-31.   In a magnetron, the magnetic field between the plate and cathode serves what purpose? 1.   Acts as a grid 2.   Provides a plate load 3.   Acts as a space-charge suppressor 4.   Provides filament power 2-32.   What property in a magnetron is controlled by the cavities in the plate? 1.   Input power 2.   Output power 3.   Input voltage 4.   Output frequency 2-33.   In a magnetron, what causes the path of an electron to curve when it is moving from the cathode to the plate? 1.   The cathode pulse 2.   The electric field 3.   The resonant cavities 4.   The permanent magnetic field 2-34.   The critical value of magnetic field strength in a magnetron causes which of the following electronic actions? 1.   Plate cavities stop oscillating 2.   Output power decreases to zero 3.   Electrons strike the plate and return to the cathode 4.   Electrons miss the plate and return to the cathode 2-35.   Magnetron oscillators are divided into what total number of classes? 1.   One 2.   Two 3.   Three 4.   Four 2-36.   THIS QUESTION HAS BEEN DELETED. 2-37.   In a negative-resistance magnetron, which, if any, of the following values of magnetic field strengths is required to start oscillations? 1.   Critical value 2.   Slightly lower than critical value 3.   Slightly higher than critical value 4.   None of the above 2-38.   In magnetrons, the effect of filament bombardment can be reduced by which of the following actions? 1.   Increasing plate voltage 2.   Reducing filament voltage 3.   Reducing signal frequency 4.   Increasing signal frequency 2-39.   In electron-resonance magnetrons, which of the following anode blocks is/are used? 1.   Vane anode 2.   Rising-sun anode 3.   Hole-and-slot anode 4.   Each of the above






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