Page:Electronics Technician - Volume 7 - Antennas and Wave Propagation - NAVEDTRA 14092.pdf/116

 3-9. Maximum transfer of energy from the source to the transmission line takes place when what impedance relationship exists between the source and the transmission line?
 * 1) When the load impedance equals the source impedance
 * 2) When the load impedance is twice the source impedance
 * 3) When the load impedance is half the source impedance
 * 4) When the load impedance is one-fourth the source impedance

3-10. Which of the following sets of terms represents a type of loss in a transmission line?
 * 1) I$2$R and induction only
 * 2) Induction and dielectric only
 * 3) Dielectric and radiation only
 * 4) I$2$R, induction, and dielectric

3-11. Skin effect is classified as which of the following types of loss?
 * 1) Copper
 * 2) Voltage
 * 3) Induction
 * 4) Dielectric

3-12. What transmission—line loss is caused by magnetic lines of force not returning to the conductor?
 * 1) Copper
 * 2) Radiation
 * 3) Induction
 * 4) Dielectric

3-13. When a dc voltage is applied to a transmission line and the load absorbs all the energy, what is the resulting relationship between current and voltage?
 * 1) They are in phase with each other
 * 2) They are equal to Z$o$ the line
 * 3) They are out of phase with each other
 * 4) They are evenly distributed along the line

3-14. The initial waves that travel from the generator to the load of a transmission line are referred to as what type of waves?
 * 1) Incident
 * 2) Refracted
 * 3) Reflected
 * 4) Diffracted

3-15. Waves that travel from the output end to the input end of a transmission line are referred to as what type of waves?
 * 1) Incident
 * 2) Refracted
 * 3) Reflected
 * 4) Diffracted

3-16. The ratio of maximum voltage to minimum voltage on a transmission line is referred to as the
 * 1) rswr
 * 2) pswr
 * 3) vswr
 * 4) iswr

3-17. Which of the following ratios samples the magnetic field along a line?
 * 1) Vszr
 * 2) Pswr
 * 3) Iswr
 * 4) Rswr

3-18. Which of the following lines is NOT a transmission medium?
 * 1) Load line
 * 2) Coaxial line
 * 3) Two—wire open line
 * 4) Twisted—pair line

3-19. Electrical power lines are most often made of which of the following types of transmission lines? 12
 * 1) Twin—lead line
 * 2) Shielded—pair line
 * 3) Two—wire open line
 * 4) Two—wire ribbon line