SERVICE TECHNICIAN 4 QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS) ALREADY
GRADED A+
Which of the following was a popular circuit in the vacuum tube era?
Ans✓✓✓Center-tapped circuit
Which of the following statements is true of a forward-biased silicon
diode? Ans✓✓✓The voltage drop across the diode is approximately 0.7
volt
Schottky barrier diodes are popular as rectifiers because Ans✓✓✓the
have a lower voltage drop than do silicon diodes
One application for the varactor diode is Ans✓✓✓As a reference
frequency standard that locks 10 MHz oscillator to a precise frequency
The intrinsic region in the middle of a PIN diode is useful because
Ans✓✓✓It allows the RF resistance of the diode to be controlled by the
DCcurrent in the diode
If we have chosen our dopants correctly to generate light energy of the
correct wavelength what must be added to a light emitting diode to make
it a Fabry-Perot (F-P) laser? Ans✓✓✓An interferometer consisting of a
mirror on one end of the laser diode and a partially-reflecting mirror on
the other end
, What is the purpose of a back-facet diode in an optical transmitter?
Ans✓✓✓To sense the light level being put out by the diode
If you needed to couple a control signal from one circuit to another.
While keeping the ground connections isolated in the two circuits, what
component would you use? Ans✓✓✓Opto-isolator
What are two uses of PIN diodes? Ans✓✓✓As current-variable RF
resistors and fast RF switches
In use, a photodiode is normally Ans✓✓✓Reverse biased.
Modulation error ratio (MER) is an indicator of digital modulation
signal quality. For error free reception and adequate margin, what should
be the minimum MER reading for a 256 QAM signal Ans✓✓✓32 dB
BER is one of the measurements a technician uses to determine how
well the network is operating. What is an acceptable post BER at the end
of the drop? Ans✓✓✓<1.0E-9
Coherent interference causes the constellation display to look like a
series of small donuts. What is one cause of coherent interference?
Ans✓✓✓In-channel ingress
DETAILED ANSWERS (VERIFIED ANSWERS) ALREADY
GRADED A+
Which of the following was a popular circuit in the vacuum tube era?
Ans✓✓✓Center-tapped circuit
Which of the following statements is true of a forward-biased silicon
diode? Ans✓✓✓The voltage drop across the diode is approximately 0.7
volt
Schottky barrier diodes are popular as rectifiers because Ans✓✓✓the
have a lower voltage drop than do silicon diodes
One application for the varactor diode is Ans✓✓✓As a reference
frequency standard that locks 10 MHz oscillator to a precise frequency
The intrinsic region in the middle of a PIN diode is useful because
Ans✓✓✓It allows the RF resistance of the diode to be controlled by the
DCcurrent in the diode
If we have chosen our dopants correctly to generate light energy of the
correct wavelength what must be added to a light emitting diode to make
it a Fabry-Perot (F-P) laser? Ans✓✓✓An interferometer consisting of a
mirror on one end of the laser diode and a partially-reflecting mirror on
the other end
, What is the purpose of a back-facet diode in an optical transmitter?
Ans✓✓✓To sense the light level being put out by the diode
If you needed to couple a control signal from one circuit to another.
While keeping the ground connections isolated in the two circuits, what
component would you use? Ans✓✓✓Opto-isolator
What are two uses of PIN diodes? Ans✓✓✓As current-variable RF
resistors and fast RF switches
In use, a photodiode is normally Ans✓✓✓Reverse biased.
Modulation error ratio (MER) is an indicator of digital modulation
signal quality. For error free reception and adequate margin, what should
be the minimum MER reading for a 256 QAM signal Ans✓✓✓32 dB
BER is one of the measurements a technician uses to determine how
well the network is operating. What is an acceptable post BER at the end
of the drop? Ans✓✓✓<1.0E-9
Coherent interference causes the constellation display to look like a
series of small donuts. What is one cause of coherent interference?
Ans✓✓✓In-channel ingress
