Electronic Principles problems
- 1. The primary impedance of a transformer is 60 ohm and the secondary impedance is 120 ohm. What is the impedance ratio?
Options- A. 0.25
- B. 180
- C. 0.5
- D. 4
- E. None of the above Discuss
Correct Answer: 0.5
- 2. Most AC power is obtained from:
Options- A. generators
- B. batteries
- C. oscillators
- D. lightning
- E. None of the above Discuss
Correct Answer: oscillators
- 3. The direction of electron current flow is:
Options- A. from right to left
- B. from positive to negative
- C. from negative to positive
- D. from neutral to positive
- E. None of the above Discuss
Correct Answer: from negative to positive
- 4. Which one of the following principles best describes the basic operation of an electromagnet?
Options- A. Current is induced in a conductor that is moving through a magnetic field
- B. Like magnetic poles repel, while unlike poles attract
- C. Current flowing through a conductor generates a magnetic field
- D. Like magnetic poles attract, while unlike poles repel
- E. None of the above Discuss
Correct Answer: Current flowing through a conductor generates a magnetic field
- 5. A current source has an internal resistance of 100 kW. What is the largest load resistance if the current source must appear stiff?
Options- A. 2 k Ohm
- B. 10 k Ohm
- C. 20 k Ohm
- D. 1 k Ohm
- E. None of the above Discuss
Correct Answer: 1 k Ohm
- 6. Which one of the following devices is most often used for measuring electrical potential difference?
Options- A. Voltmeter
- B. Ohmmeter
- C. Ammeter
- D. Wattmeter
- E. None of the above Discuss
Correct Answer: Voltmeter
- 7. Silicon atoms combine into an orderly pattern called a
Options- A. Crystal
- B. Covalent bond
- C. Semiconductor
- D. Valence orbit
- E. None of the above Discuss
Correct Answer: Crystal
- 8. The rotating coil of wire in an electric motor is called the:
Options- A. armature
- B. brush
- C. commutator
- D. loop
- E. None of the above Discuss
Correct Answer: armature
- 9. Electron current is flowing through a conductor in a direction you might describe as straight into this page. What is the direction of the resulting magnetic field?
Options- A. Clockwise
- B. Counterclockwise
- C. Out of this page
- D. Into this page
- E. None of the above Discuss
Correct Answer: Counterclockwise
- 10. Which one of the following statements most accurately applies to the frequency of a waveform?
Options- A. The actual frequency of a sine waveform is 1.41 times the working frequency
- B. Unless specified otherwise, the frequency of a waveform is assumed to be 60 Hz
- C. The higher the amplitude of a waveform, the higher its frequency
- D. The longer the period of a waveform, the lower its frequency
- E. None of the above Discuss
Correct Answer: The actual frequency of a sine waveform is 1.41 times the working frequency
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