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Electronic Technology. Chapter 19. Preview. CRCT Preparation. Chapter 19. CRCT Preparation. 1. What happens to the current in the circuit if the manual switch is opened?. A Current stops in the smaller loop but continues in the larger loop. - PowerPoint PPT PresentationTRANSCRIPT
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Electronic Technology
Preview
Chapter 19
CRCT Preparation
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CRCT PreparationChapter 19
1. What happens to the current in the circuit if the manual switch is opened?
A Current stops in the smaller loop but continues in the larger loop.
B Current stops in the larger loop but continues in the smaller loop.
C Current stops in both loops.
D The direction of the current is reversed.
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CRCT PreparationChapter 19
1. What happens to the current in the circuit if the manual switch is opened?
A Current stops in the smaller loop but continues in the larger loop.
B Current stops in the larger loop but continues in the smaller loop.
C Current stops in both loops.
D The direction of the current is reversed.
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Chapter 19 CRCT Preparation
2. Quinyana is using the circuit diagram to design a sound amplifier. She replaced the manual switch with a microphone. What other part should she replace?
A She should replace the transistor with a speaker.
B She should replace the transistor with a volume control dial.
C She should replace the motor with a speaker.
D She should replace the motor with a volume control dial.
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Chapter 19 CRCT Preparation
2. Quinyana is using the circuit diagram to design a sound amplifier. She replaced the manual switch with a microphone. What other part should she replace?
A She should replace the transistor with a speaker.
B She should replace the transistor with a volume control dial.
C She should replace the motor with a speaker.
D She should replace the motor with a volume control dial.
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3. A company produces electronic components that are used in radios to convert alternating current (AC) to direct current (DC). On one assembly line, machines layer an n-type semi-conductor into a mold. What else should be added to complete the component?
A one n-type semiconductor
B one p-type semiconductor
C two p-type semiconductors
D one p-type semiconductor and one n-type semiconductor
Chapter 19 CRCT Preparation
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Chapter 19 CRCT Preparation
3. A company produces electronic components that are used in radios to convert alternating current (AC) to direct current (DC). On one assembly line, machines layer an n-type semi-conductor into a mold. What else should be added to complete the component?
A one n-type semiconductor
B one p-type semiconductor
C two p-type semiconductors
D one p-type semiconductor and one n-type semiconductor
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4. Which of these devices converts sound energy into electrical energy?
A telephone
B speaker
C digital alarm clock
D remote control
Chapter 19 CRCT Preparation
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Chapter 19 CRCT Preparation
4. Which of these devices converts sound energy into electrical energy?
A telephone
B speaker
C digital alarm clock
D remote control
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5. Laptop computers have very thin screens. How might a laptop computer screen produce images?
A Electron beams sweep the screen and cause fluorescent materials to glow.
B Laser beams shine behind the screen and create patterns of reflected light.
C Vibrations in thousands of electron tubes transfer energy to wells of colored light.
D Charged atoms of gas in wells on the screen transfer energy to fluorescent materials.
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5. Laptop computers have very thin screens. How might a laptop computer screen produce images?
A Electron beams sweep the screen and cause fluorescent materials to glow.
B Laser beams shine behind the screen and create patterns of reflected light.
C Vibrations in thousands of electron tubes transfer energy to wells of colored light.
D Charged atoms of gas in wells on the screen transfer energy to fluorescent materials.
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6. Cecily uses a remote control to turn on her DVD player. What kind of hardware is the remote?
A a central processing unit
B an input device
C an output device
D an interface card
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6. Cecily uses a remote control to turn on her DVD player. What kind of hardware is the remote?
A a central processing unit
B an input device
C an output device
D an interface card
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7. Which element in the table could be used with silicon to make a p-type semiconductor?
A boron
B germanium
C phosphorus
D selenium
Chapter 19 CRCT Preparation
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7. Which element in the table could be used with silicon to make a p-type semiconductor?
A boron
B germanium
C phosphorus
D selenium
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Chapter 19
8. Which of the following works in an analog way?
A a remote control for a television
B a volume control dial on a stereo
C a programmable thermostat
D a light switch
CRCT Preparation
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Chapter 19 CRCT Preparation
8. Which of the following works in an analog way?
A a remote control for a television
B a volume control dial on a stereo
C a programmable thermostat
D a light switch
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9. Why do remote-controlled toy cars contain transistors instead of vacuum tubes?
A Transistors change AC to DC, but vacuum tubes do not.
B Transistors amplify electric current, but vacuum tubes do not.
C Transistors are energy sources, but vacuum tubes are not.
D Transistors are small and light, but vacuum tubes are not.
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9. Why do remote-controlled toy cars contain transistors instead of vacuum tubes?
A Transistors change AC to DC, but vacuum tubes do not.
B Transistors amplify electric current, but vacuum tubes do not.
C Transistors are energy sources, but vacuum tubes are not.
D Transistors are small and light, but vacuum tubes are not.
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10. Would a diode containing only two p-type semiconductors conduct an electric current? Explain your answer.
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10. Answer - This diode would not conduct an electric current. Full-credit answers should include the following points:
• A diode needs a p-type and an n-type semiconductor to create a current.
• When layers are joined, extra electrons from the n-type layer flow to plug holes in the p-type layer. An electric current is created when an energy source is connected such that the positive terminal is closest to the p-type semiconductor.
• If two p-type semiconductors were joined together, there would be no extra electrons to fill in the holes. Therefore, a diode with only two p-type layers would not conduct more than a very weak electric current.
Chapter 19 CRCT Preparation
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11. Telephones and radios are similar because they both convert signals into sound waves. Describe two ways in which telephones and radios are different.
Chapter 19 CRCT Preparation
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11. Answers may include:
• In telephones, signals are transmitted by electric current to and from the telephone receiver. In radios, signals are transmitted by modulated radio waves from a radio station to a radio receiver.
• Telephones are also different from radios because telephones transmit and receive signals. Most commercial radios just receive signals.
Chapter 19 CRCT Preparation