True/False Indicate whether the statement is
true or false.


1.

If the measured power is smaller than the reference
power, the dB calculated will be a positive number and indicate a measurement of loss.


2.

If the measured power is larger than the reference
power, the dB calculated will be a positive number and indicate a measurement of gain.


3.

International standards and some US standards that have adopted them calculate
loss or attenuation as a positive number and gain as negative number, different from other
definitions of dB.

Multiple Choice Identify the choice that best
completes the statement or answers the question.


4.

The “dB” or “decibel” was named for _________.
a.  The Liberty Bell  b.  Alexander Graham Bell  c.  Belle
Star  d.  The Bell Curve 


5.

In the equation defining dB, power is measured in units
of ________.
a.  Watts, milliwatts or microwatts  b.  dB  c.  dBm  d.  Newtons 


6.

If the dB equation is used for defining dBm,
________.
a.  The measured power must be in milliwatts  b.  The reference power
is 1 milliwatt  c.  The reference power can be any power from +20 to 30 dBm  d.  Both measurements
must be in dB 


7.

If the measured power is twice the reference power, the
dB equation will calculate the dB change as , ________.
a.  3dB  b.  2 dB  c.  0
dB  d.  +3dB 


8.

If the measured power is equal to the reference power,
the dB equation will calculate the dB as , ________.
a.  3dB  b.  2 dB  c.  0
dB  d.  +3dB 


9.

If the measured power is half the reference power, the
dB equation will calculate the dB change as , ________.
a.  3dB  b.  2 dB  c.  0
dB  d.  +3dB 


10.

The difference between dB and dBm is ___________.
a.  dB measures power while dBm measures gain or loss  b.  dBm measures power
while dB measures gain or loss 


11.

If you are measuring the output of a fiber optic transmitter, you make the
measurement in _________.


12.

If you are measuring the input of a fiber optic receiver, you make the
measurement in _________.


13.

If you are measuring the loss of a fiber optic cable, you make the measurement
in _________.


14.

OTDRs and OLTS measure loss as a positive number and gain as a negative number
because ____________.
a.  Both mresure the loss first then the reference  b.  They follow an
international standard that changed the dB equation  c.  Both measure using backscatter which changes
the ratio of power  d.  Their display cannot show negative
numbers 
