1. what type of voltage is supplied by a rectifier?
TRANSCRIPT
1. What type of voltage is 1. What type of voltage is supplied by a rectifier?supplied by a rectifier?
2. What type of voltage is 2. What type of voltage is usually required by most usually required by most electronic equipment?electronic equipment?
3. What is the purpose of a 3. What is the purpose of a filter used in a rectifier filter used in a rectifier
circuit?circuit?
4. What do you call the filter that 4. What do you call the filter that uses a capacitor as the first uses a capacitor as the first
component following the rectifier component following the rectifier output?output?
6. What do you call the filter that 6. What do you call the filter that uses a coil as the first uses a coil as the first
component following the rectifier component following the rectifier output?output?
8. When is the pi filter with 8. When is the pi filter with the resistor in it mainly used?the resistor in it mainly used?
10. Which is the most common 10. Which is the most common filter configuration found in filter configuration found in
power supplies?power supplies?
It is a network of resistors It is a network of resistors and inductors or capacitors.and inductors or capacitors.
To filter means to oppose or To filter means to oppose or reject voltages and currents of reject voltages and currents of certain frequencies while also certain frequencies while also offering little opposition to or offering little opposition to or
passing of voltages and passing of voltages and currents of other frequencies.currents of other frequencies.
The total opposition to current The total opposition to current flow in RL circuits.flow in RL circuits.
17. What do you call a filter circuit 17. What do you call a filter circuit that contains resistance and that contains resistance and
capacitance?capacitance?
19. If input frequency decreases in 19. If input frequency decreases in an RL circuit, what happens to an RL circuit, what happens to
voltage across the resistor?voltage across the resistor?
20. What is another name for a 20. What is another name for a high-frequency discriminator?high-frequency discriminator?
A filter that passes high frequencies A filter that passes high frequencies and discriminates or blocks low and discriminates or blocks low
frequencies.frequencies.
A filter that passes low frequencies A filter that passes low frequencies and discriminates or blocks the and discriminates or blocks the
high frequencies.high frequencies.
23. How can a capacitor act as a 23. How can a capacitor act as a high-pass filter in one instance and high-pass filter in one instance and
as a low-pass filter in another as a low-pass filter in another instance?instance?
It is determined by the capacitor’s It is determined by the capacitor’s position either across a load or in position either across a load or in
series with a load.series with a load.
24. What do you call a speaker 24. What do you call a speaker that produces low-frequency that produces low-frequency
sounds?sounds?
25. What type of speaker is 25. What type of speaker is wired across a resistor?wired across a resistor?
28. What is the function of 28. What is the function of the voltage regulator?the voltage regulator?
It keeps the output voltage at a It keeps the output voltage at a constant level under varying constant level under varying
loads.loads.
29. What are some reasons why 29. What are some reasons why voltage might vary in a circuit?voltage might vary in a circuit?
Input line voltage may vary; load Input line voltage may vary; load on the power supply might on the power supply might
change; and components could change; and components could be old.be old.
30. What is the simplest type 30. What is the simplest type of voltage regulator?of voltage regulator?
31. Which type of voltage 31. Which type of voltage regulator has the regulating regulator has the regulating device connected in series?device connected in series?
32. Which regulator has the 32. Which regulator has the regulating device connected in regulating device connected in
parallel with the load?parallel with the load?
33. In a shunt regulator, how is 33. In a shunt regulator, how is the regulating device the regulating device
connected?connected?
34. In a shunt regulator, what is 34. In a shunt regulator, what is the voltage across the RV plus the voltage across the RV plus
the voltage across RS equal to?the voltage across RS equal to?
35. What is the only adjustment 35. What is the only adjustment that can be made in a shunt that can be made in a shunt
resistor?resistor?
36. What happens to the 36. What happens to the voltage drop across RS when voltage drop across RS when there is an increase in current there is an increase in current
through RS?through RS?
37. What type of diode is used 37. What type of diode is used as an automatic regulating as an automatic regulating
device?device?
38. Why is a zener diode used 38. Why is a zener diode used instead of a variable resistor in instead of a variable resistor in
most regulators?most regulators?
Because the input voltage of a Because the input voltage of a variable resistor will fluctuate variable resistor will fluctuate too rapidly to be controlled by too rapidly to be controlled by
hand.hand.
39. What voltage level does a 39. What voltage level does a zener diode maintain?zener diode maintain?
A constant voltage level as long A constant voltage level as long as the zener continues to as the zener continues to
conduct.conduct.
It makes it possible to obtain It makes it possible to obtain more than one voltage from a more than one voltage from a
single power source.single power source.
42. What is the simplest form 42. What is the simplest form of a voltage divider?of a voltage divider?
A simple series-parallel circuit A simple series-parallel circuit with a number of resistors in with a number of resistors in series with a power source.series with a power source.
44. What formula do you use to 44. What formula do you use to determine amps when you know determine amps when you know
the resistance and voltage?the resistance and voltage?
A condition when no load or A condition when no load or energy using device is energy using device is
connected to the voltage divider.connected to the voltage divider.
Connecting a load to a voltage Connecting a load to a voltage divider changes the output.divider changes the output.
47. What is the purpose of a 47. What is the purpose of a bleeder resistor when bleeder resistor when
equipment is turned off.equipment is turned off.
To provide a discharge path To provide a discharge path for the filter capacitor voltage.for the filter capacitor voltage.
The small amount of current in a The small amount of current in a voltage divider that flows voltage divider that flows
through the bleeder resistor and through the bleeder resistor and aids in voltage regulation.aids in voltage regulation.
49. What type of voltages can 49. What type of voltages can be obtained from a single be obtained from a single
voltage divider?voltage divider?
50. What happens to total 50. What happens to total output voltage when a load is output voltage when a load is
connected to a voltage divider?connected to a voltage divider?
51. What provides the correct 51. What provides the correct amount of voltage and current amount of voltage and current
to operate an electronic to operate an electronic system?system?
52. What is the most common 52. What is the most common way of connecting the line way of connecting the line voltage to a power supply?voltage to a power supply?
53. What are the first two 53. What are the first two functions of the input stage of functions of the input stage of
the power supply?the power supply?
To provide a method of coupling To provide a method of coupling the AC line into the power the AC line into the power
supply and to provide overload supply and to provide overload protection.protection.
54. What can provide 54. What can provide overload protection to a overload protection to a
power supply?power supply?
55. How does a fuse provide 55. How does a fuse provide protection to a circuit?protection to a circuit?
A fuse will melt, opening the A fuse will melt, opening the circuit, when it is overheated.circuit, when it is overheated.
56. What is the advantage of 56. What is the advantage of using a circuit breaker instead using a circuit breaker instead
of a fuse?of a fuse?
A circuit breaker can be reset A circuit breaker can be reset and used again, but a fuse must and used again, but a fuse must
be replaced.be replaced.
57. What are the last two 57. What are the last two functions of the input stage of a functions of the input stage of a
power supply?power supply?
To provide an indication that To provide an indication that power is on and to provide a power is on and to provide a
means of turning the power on means of turning the power on and off.and off.
59. Which substage steps up or 59. Which substage steps up or steps down AC line voltage?steps down AC line voltage?
The filter substage smooths out the The filter substage smooths out the pulsating DC into smooth DC.pulsating DC into smooth DC.
61. What does the rectifier do in the 61. What does the rectifier do in the conversion stage of the power conversion stage of the power
supply?supply?
The rectifier receives the voltage The rectifier receives the voltage from the transformer secondary from the transformer secondary and converts it to DC voltage.and converts it to DC voltage.
62. What are the three substages in 62. What are the three substages in the conversion stage of the power the conversion stage of the power
supply?supply?
64. What is the basic function of 64. What is the basic function of this final stage of the power this final stage of the power
supply?supply?
69. What do you call a non-69. What do you call a non-rotating device used for rotating device used for
producing alternating current producing alternating current from a direct current supply?from a direct current supply?
70. Why is the word “non-70. Why is the word “non-rotating” used in describing an rotating” used in describing an
oscillator?oscillator?
So the word will not be So the word will not be confused with alternator or confused with alternator or
generator.generator.
71. How do you refer to 71. How do you refer to something that moves back and something that moves back and
forth in a uniform manner?forth in a uniform manner?
72. What conditions must exist 72. What conditions must exist for something to oscillate?for something to oscillate?
There must be a back and forth There must be a back and forth motion and the period for the motion and the period for the
back and forth motion must be back and forth motion must be the same.the same.
73. What are the three essential 73. What are the three essential sections of an oscillator circuit?sections of an oscillator circuit?
Feedback, amplifier, and Feedback, amplifier, and frequency determining device.frequency determining device.
74. Which section of the 74. Which section of the oscillator develops the desired oscillator develops the desired
AC frequency?AC frequency?
76. What does the tank circuit 76. What does the tank circuit have to do to continue have to do to continue
oscillating?oscillating?
77. What is another term for 77. What is another term for positive feedback in an positive feedback in an
oscillator?oscillator?
78. What actually does the 78. What actually does the oscillating in an oscillator?oscillating in an oscillator?
79. What section of the 79. What section of the oscillator amplifies the tank oscillator amplifies the tank
circuit output to a usable level?circuit output to a usable level?
80. Why does the feedback 80. Why does the feedback circuit return part of the circuit return part of the
oscillation output signal back oscillation output signal back into the tank circuit?into the tank circuit?
81. What part of the oscillator 81. What part of the oscillator replaces the energy lost in the replaces the energy lost in the
tank circuit?tank circuit?
82. What happens if one stage 82. What happens if one stage or section of the oscillator fails or section of the oscillator fails
to function?to function?
83. What do you do when 83. What do you do when you troubleshoot a circuit?you troubleshoot a circuit?
You locate and correct any You locate and correct any malfunction in the circuit.malfunction in the circuit.
A defect in a circuit that permits A defect in a circuit that permits current to flow around all or part current to flow around all or part
of the load.of the load.
85. What has happened to 85. What has happened to equipment that has equipment that has
malfunctioned?malfunctioned?
A circuit that does not provide a A circuit that does not provide a complete path for current flow.complete path for current flow.
A condition in a circuit that A condition in a circuit that occurs when a conducting occurs when a conducting
material forms a path directly material forms a path directly between the terminals of a between the terminals of a
source.source.
A condition that exists when a A condition that exists when a short circuit bypasses only part short circuit bypasses only part of the normal load in a circuit.of the normal load in a circuit.
A safety device used to protect A safety device used to protect a circuit and electrical a circuit and electrical
components against excessive components against excessive amounts of current.amounts of current.
91. What has happened to a 91. What has happened to a circuit when a fuse has blown?circuit when a fuse has blown?
92. What instruments can be 92. What instruments can be used in locating shorts?used in locating shorts?
A blown fuse, dirt on switch A blown fuse, dirt on switch contacts, broken wires, or contacts, broken wires, or burned out components.burned out components.
Broken or cut insulation wires, Broken or cut insulation wires, loose tools, or loose pieces or loose tools, or loose pieces or
wire.wire.
98. What is an important safety 98. What is an important safety rule for you to remember when rule for you to remember when you are working on any type of you are working on any type of
electronic equipment?electronic equipment?
Electric current flowing Electric current flowing through an individual’s body.through an individual’s body.
101. How can an electric 101. How can an electric shock kill an individual?shock kill an individual?
102. What could cause an 102. What could cause an individual’s body to have a low individual’s body to have a low resistance to electric shock?resistance to electric shock?
If his or her skin is moist or If his or her skin is moist or there are cuts on his or her there are cuts on his or her
body.body.
A mechanical or manual means A mechanical or manual means or inducing breathing in or inducing breathing in
someone when breathing has someone when breathing has stopped.stopped.
104. What is the first thing that 104. What is the first thing that you must do if you see you must do if you see
someone receive an electric someone receive an electric shock?shock?
105. When would you stop 105. When would you stop administering artificial administering artificial
respiration?respiration?
When the victim starts to breath When the victim starts to breath or when professional medical or when professional medical
assistance arrives.assistance arrives.
106. Why is it important to have 106. Why is it important to have adequate light when you are adequate light when you are
working on an energized circuit?working on an energized circuit?
107. What should you stand on 107. What should you stand on when you work on energized when you work on energized
equipment?equipment?