1. Assume that the maximum gain of an amplifier is 35 db. If the overall
amplifier-attenuator gain needed is 27 db, the technician must adjust the input
attenuator to a loss of
a. 0 db.
c. 27 db.
b. 8 db.
d. 35 db.
2. When the circuit conditioner examines a
cutoff he looks for the point where the level
drops 3 db from that at the
midpoint of the bandpass. If the power level at
midpoint of the bandpass is 8
mw, the scale in figure 2-4 shows that the cutoff
is at a level of
a. 2 mw.
c. 5 mw.
b. 4 mw.
d. 11 mw.
3. Several factors bear on the reliability of voltage readings used to
determine signal power levels.
However, the most important combination of
factors is the
a. value of measured voltage and circuit impedance.
b. circuit impedance and the frequency of the test signal.
c. accuracy of the instrument and the value of measured voltage.
d. frequency of the test signal and the accuracy of the instrument.
4. Assume that a 1,000-Hz test tone from the signal generator is applied to
the ATT IN jack, and the level of -4 dbm is measured at the PAD OUT jack with
the DB meter. If the voltmeter is used to measure the same level, table II in
paragraph 2-2b shows that the meter should read
a. 1.23 volts.
c. 0.489 volt.
b. 0.775 volt.
d. 0.388 volt.
5. An accurate ac voltmeter may be used to establish a reference level of 0
dbm by taking the voltage drop across a calibrated resistor. The 1-mw standard
will be obtained when the meter reads
a. 0.775 volt across a 600-ohm resistor.
b. 0.3873 volt across a 75-ohm resistor.
c. 0.2739 volt across a 150-ohm resistor.
d. 0.3073 volt across a 600-ohm resistor.
6. Assume that you measure the composite line signal from a four-channel FDM
terminal, and find it to be +3 dbm. If each channel produces the same level,
the power in each channel signal is