CHAPTER 3 TRANSLINE

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

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

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

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

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

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

• a. Increases
• c. unchanged
• b. Decreases
• d. doubles

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

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

• a. High load impedance
• b. Low ohmic resistance
• c. Matching of impedance
• d. Inductive impedance

9. The characteristic impedance of a cable depends on:

• 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
• d. the inductance 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
• d. A and B above