9. The characteristic impedance of a cable depends on:

d. the inductance per foot and the capacitance per foot

a. the resistance per foot of the wire used

b. the resistance per foot and the Inductance per foot

c. the resistance per foot and the capacitance per foot

10. The term "balance line" means that:

a. both conductors carry currents that flow in opposite directors

b. conductors present equal capacitance to ground

c. one conductor is connected to ground

12. If an antenna is correctly matched to a transmitter , the length of transmission line:

d. will have no effect on the matching

a. must be a full wavelength long

b. must be an odd number of quarter-wave

c. must be an even number of half-waves

13. When sending power down a transmission line, it is usually desirable that as much power as possible will be absorbed by the load and as little as possible will be reflected back to the source. A negative voltage pulse sent down a transmission line terminated with its characteristic impedance:

a. would reflect as a positive pulse

b. would reflect as negative pulse

c. would reflect as a positive pulse followed by a negative pulse

15. The conductance value of a transmission line represents which of the following values?

a. expected value of current flow through the insulation

b. expected value of voltage supplied by the transmitter

c. value of the lump and distributed constants of the line divided by impedance

16. The reason that in BF transmission line should be matched at the transmitter end is to:

b. transfer the maximum amount of power to the antenna

a. ensure that the radiated signal has the intended polarization

d. overcome fading of the transmitted signal

17. In a transmission line:

b. if the load impedance is lesser than the line characteristic impedance, the reflection coefficient is negative

a. if the load impedance is greater than the line characteristic impedance, the reflection coefficient is negative

c. if the load impedance is equal to the line characteristic impedance, the reflection coefficient is equal to 1

d. if the load impedance is equal to the line characteristic impedance, the reflection coefficient will be maximum

19. What is an unbalanced line?

d. feed line with one conductor connected to ground

a. feed line with neither conductor connected to ground

b. feed line with both conductors connected to ground

c. feed line with both conductors connected to each other

22. If the load impedance is equal to line characteristic impedance, which of the following can you observe?

d. all of the given choices can be observed

a. there is maximum power transfer

b. the reflection coefficient is zero

c. the standing wave ratio is equal to 1

23. A positive voltage pulse sent down a transmission line terminated in a short-circuit:

b. would reflect as a negative pulse

a. would reflect as a positive pulse

c. would reflect as a positive pulse followed by a negative pulse

25. If your transmitter and antenna are

a. shorten the excess cable so the feed line is an odd number of wavelengths long

C. roll the excess cable into a coil which is as small as possible

c. shorten the excess cable so the feed line is an even number of wavelengths long

26. A positive voltage pulse sent down a transmission line terminated with its characteristic impedance:

a. would reflect as a positive pulse

b. would reflect as a negative pulse

c. would reflect as a positive pulse followed by a negative pulse

27. A transmission line that has current flowing through it has which, if any, of the following fields about it?

c. both electric and magnetic fields

29. A positive voltage-pulse sent down a transmission line terminated in an open-circuit:

a. would reflect as a positive pulse

b. would reflect as a negative pulse

c. would reflect as a positive pulse followed by a negative pulse

30. Maximum transfer of energy from the source to the transmission line takes place when what impedance relationship exists between the and the transmission line?

a. when the load impedance equals source impedance

b. when the load impedance is twice the source impedance

c. when the load impedance is half the source impedance

d. when the load impedance is one-fourth the source impedance

31. The characteristic impedance of a transmission line is determined by the:

b. physical dimensions and relative positions of the conductors

c. frequency at which the line is operated

35. A non-optimum value for SWR will cause:

c. higher voltage peaks on cable

37. The impedance of a coaxial line:

a. can be the same for different diameter line

b. changes with the frequency of the energy it carries

c. is correct for only one size of line

d. is greater for larger diameter line

38. When should lumped values for transmission-line constants be used to calculate characteristic impedance?

a. when the line is short compared to one wavelength

b. when the line is long compared to one wavelength

c. when the line is infinitely long

39. The characteristic impedance of a transmission line is:

d. equal to the pure resistance which, if connected to the end of the line, will absorb all the power arriving along it

a. the impedance of a section of the line one wavelength long

b. the dynamic impedance of the line at the operating frequency

c. the ratio of the power supplied to the line to the power delivered to the termination

40. 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?

d. they are evenly distributed along the line

a. they are in phase with each other

b. they are equal to Zo of the line

c. they are out of phase with each other

43. The characteristic impedance of a parallel wire transmission line does not depend on the:

a. velocity of energy on the line

c. centre to centre distance between conductors

45. The characteristic impedance for an infinite transmission line can be figured using which of the following ratios?

b. input voltage to input current

c. input voltage to line resistance

d. input current to line resistance

46. Any length of transmission line may be made to appear as an infinitely long line by:

a. terminating the line in its characteristic impedance

b. leaving the line open at the end

c. shorting the line at the end

d. increasing the standing wave ratio above unity

47. When a transmission line is not terminated in its characteristic impedance (Zo), what happens to the incident energy that is not transferred to the load?

a. it is returned along the transmission line

d. it is converted to heat energy

48. What factors determine the characteristic impedance of a parallel- conductor antenna feed line?

a. the distance between the centres of the conductors and the radius of the conductors

b. the distance between the centres of the conductors and the length of the line

c. the radius of the conductors and the frequency of the signal

d. the frequency of the signal and the length of the line

50. What factors determine the characteristic impedance of a coaxial antenna feed line?

a. the ratio of the diameter of the inner conductor to the diameter of the braid

b. the diameter of the braid and the length of the line

c. the diameter of the braid and the frequency of the signal

d. the frequency of the signal and the length of the line

51. The center of the Smith chart always represents:

c. the characteristic impedance

CHAPTER 3 TRANSLINE

Authored by Hades Vlank

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

1. What happens when the impedance of an electrical load is equal to the Internal Impedance of the power source?

a. the electrical load is shorted

b. the source delivers maximum power to the load

c. current can flow through the circuit

d. the source delivers minimum power to the load

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

2. Determine the impedance of an infinitely long section of a particular Cable having a capacitance of

a. 35 ohms

c. 20 ohms

b. 140 ohms

d. 300 ohms

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

3. What is the primary advantage of a rigid coaxial line?

a. low radiation losses

b. inexpensive construction

c. low high-frequency losses

d. each of the above

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

4. What is the major factor that makes coaxial-cable less susceptible to noise than twisted-pair cable?

a. inner conductor

b. diameter of cable

c. outer conductor

d. insulating material

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

5. Why is impedance matching important?

a. so the load will draw minimum power from the source

b. to ensure that there is less resistance than reactance in the circuit

c. to ensure that the resistance and reactance in the circuit are equal

d. so the source can deliver maximum power to the load

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

6. In twisted pair cables, as the number of twists decreases, the capacity:

a. Increases

c. unchanged

b. Decreases

d. doubles

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

7. As frequency increases, the loss in a cable's dielectric:

a. increases

b. decreases

c. stays the same

d. there is no loss in a dielectric

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CHAPTER 3 TRANSLINE

1. What happens when the impedance of an electrical load is equal to the Internal Impedance of the power source?

2. Determine the impedance of an infinitely long section of a particular Cable having a capacitance of

3. What is the primary advantage of a rigid coaxial line?

4. What is the major factor that makes coaxial-cable less susceptible to noise than twisted-pair cable?

5. Why is impedance matching important?

6. In twisted pair cables, as the number of twists decreases, the capacity:

7. As frequency increases, the loss in a cable's dielectric:

8. To obtain efficient power transmission from a transmitter to an antenna requires:

9. The characteristic impedance of a cable depends on:

10. The term "balance line" means that:

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