1-18.
The bel most often expresses what value
of any component, circuit, or system?
1. Power
2. Input
3. Output
4. Ratio of input to output power
1-19.
In the formula for bel, which of the
following symbols would represent the
output of an amplifier?
1. N
2. PI
3.
P2
4. Log10
1-20.
In the formula for bel, which of the
following symbols would represent the
gain of an amplifier in bels?
1.
N
2.
P1
3.
P2
4.
Log10
1-21.
The decibel is equal to what total number
of bels?
1 .
1/10 bel
2 .
1/100 bel
3 .
1 bel
4 .
10 bels
1-22.
A value of 1.5 bels is equal to what total
number of decibels?
1 .
15
.
2 .
15
3 .
150
4.
1,500
1-23.
What is the power ratio of an increase of
a reference signal of 30 dBs?
1.
10
2.
100
3.
1,000
4.
10,000
1-24.
A power gain of -6 dB from a reference
signal of 1,000 watts results in what
maximum value of output signal?
1. 250 watts
2. 500 watts
3. 2,500 watts
4. 5,000 watts
1-25.
When dBm is measured, which of the
following signals is normally the
reference signal?
1. Input
2. Output
3. 1 milliwatt
4. 1 millivolt
1-26.
Which of the following signal levels
indicates that the output signal is greater
than the input signal?
1 .
5 dB
2 .
+3 dB
3 .
Either 1 or 2 above
4 .
-2 dB
1-27.
A reading of 0 dB indicates that the
output signal has what relationship to the
reference signal?
1. Equal to
2. Less than
3. Greater than
4. Not equal to
3
