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- Question
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
- Correct Answer
- Current flowing through a conductor generates a magnetic field
- 1. 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
- 2. Most AC power is obtained from:
Options- A. generators
- B. batteries
- C. oscillators
- D. lightning
- E. None of the above Discuss
- 3. 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
- 4. For normal operation of the transistor, the collector diode has to be
Options- A. Forward-biased
- B. Reverse-biased
- C. Nonconducting
- D. Operating in the breakdown region
- E. None of the above Discuss
- 5. Which one of the following statements is true for the currents in a parallel RL circuit?
Options- A. The total current is equal to the sum of the currents through the resistance and inductance
- B. The current always has the same amplitude and phase for every part of the circuit
- C. The total current is less than the sum of the currents through the resistance and inductance
- D. The total current leads the total voltage by less than 90
- E. None of the above Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. 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
Electronic Principles problems
Search Results
Correct Answer: from negative to positive
Correct Answer: oscillators
Correct Answer: 0.5
Correct Answer: Reverse-biased
Correct Answer: The total current is less than the sum of the currents through the resistance and inductance
Correct Answer: 1 k Ohm
Correct Answer: Voltmeter
Correct Answer: Crystal
Correct Answer: armature
Correct Answer: Counterclockwise
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