19. Technical control personnel must be able to recognize the significance
of terminology abbreviations such as dBm, dBr, dBa, and dBrn.
which can be used to indicate the power level of either signal or noise is
20. Assume that a noise reading of +68 dBrn (C-message) is obtained on a
noise measuring test set. This indicates that the level is
a. higher than 0 dBrn and the line is normally terminated by a 500-type
b. lower than 0 dBrn and the line is normally terminated by a 302-type
c. higher than 0 dBa and the line is terminated by a circuit that has a
d. lower than dBa0 and the line is terminated by a resistor.
Check your answers with Lesson 1: Practice Exercise Solution Sheet (page
103) and make necessary corrections.