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ANSWERS TO QUESTIONS Q1. AND Q20.

A1. A bridge circuit is balanced when the opposite legs of the comparing and measuring circuits exhibit the same voltage drop.
A2. The capacitive and inductive characteristics of the test leads.
A3. As the supply voltage increase]s, bridge components may heat up and become less accurate.
A4. Small values of resistances.
A5. A standard capacitor.
A6. Both measure phase angle and magnitude in determining impedance.
A7. High vswr, which equates to poor reception or a loss of power output.
A8. DB, dBm, and vu.
A9. 600-ohm load.
A10. DB meters are used for measuring sine waves. Vu meters are used to measure the average value of complex waveforms.
A11. Current transformers.
A12. Electronic wattmeters are capable of measuring high-fequency signals.
A13. Most in-line wattmeters are capable of measuring both forward and reflected power.
A14. Temperature-sensitive material that exhibits a large negative temperature coefficient.
A15. Temperature, mass, and time.
A16. As power is applied, the medium heats up in proportion to the applied power.
A17. The National Bureau of Standards.
A18. They are used to monitor fixed motor speeds.
A19. Monitor a submultiple frequency to prolong the flasher-tube life.
A20. Power is absorbed by the frequency meter cavity; and a pronounced dip in power, at the output, will be observed.