Transcript Chapter 19
Chapter 19 Electronic Technology Preview CRCT Preparation < Back Next > Preview Main 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. 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. < Back Next > Preview Main 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. 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. < Back Next > Preview Main 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. < Back Next > Preview Main 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. < Back Next > Preview Main 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 < Back Next > Preview Main 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 < Back Next > Preview Main 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 < Back Next > Preview Main 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 < Back Next > Preview Main Chapter 19 CRCT Preparation 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. < Back Next > Preview Main Chapter 19 CRCT Preparation 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. < Back Next > Preview Main Chapter 19 CRCT Preparation 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 < Back Next > Preview Main Chapter 19 CRCT Preparation 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 < Back Next > Preview Main Chapter 19 CRCT Preparation 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 < Back Next > Preview Main Chapter 19 CRCT Preparation 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 < Back Next > Preview Main 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 < Back Next > Preview Main 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 < Back Next > Preview Main Chapter 19 CRCT Preparation 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. < Back Next > Preview Main Chapter 19 CRCT Preparation 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. < Back Next > Preview Main Chapter 19 CRCT Preparation 10. Would a diode containing only two p-type semiconductors conduct an electric current? Explain your answer. < Back Next > Preview Main Chapter 19 CRCT Preparation 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. < Back Next > Preview Main Chapter 19 CRCT Preparation 11. Telephones and radios are similar because they both convert signals into sound waves. Describe two ways in which telephones and radios are different. < Back Next > Preview Main Chapter 19 CRCT Preparation 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. < Back Next > Preview Main