Flashcards in NAVEDTRA 14182A, NEETS Mod. 10, Ch. 3 Deck (19):
Which device is designed to guide electrical energy from one point to another?
Which type of line is most often used for power lines, rural telephone lines, and telegraph lines?
Two-wire open line
Which type of line consists of two insulated wires twisted together to form a flexible line without the use of spacers?
Leakage caused by the condensation of moisture is prevented in some rigid line applications by the use of what?
What was developed to replace rubber and eliminate high-frequency losses associated with rubber insulators?
The radius of bends in the waveguide must measure greater than how many wavelengths at the operating frequency of the equipment to avoid excessive attenuation?
Line losses may be any of three types— Radiation/Induction, Dielectric, and what else?
Copper losses can be minimized and conductivity increased in an RF line by plating the line with what?
Which type of losses occur because some magnetic lines of force about a conductor do not return to the conductor when the cycle alternates?
What determines the amount of current that can flow when a given voltage is applied to an infinitely long line?
The characteristic impedance of lines in actual use normally lies between 50 and how many ohms?
When a transmission line is "short” compared to the length of the radio-frequency waves it carries, the opposition presented to the input terminals is determined primarily by what?
If a line is not terminated in characteristic impedance, what is it said to be?
What are voltages called that are moving toward the receiving end of a line?
Which type of line has no standing waves of current and voltage?
Which type of line has a finite length and is not terminated in its characteristic impedance?
What is the ratio of maximum voltage to minimum voltage on a line called?
What are hollow metal tubes used to transfer energy from one point to another?