Electronic Principles problems
- 1. A battery is a device composed of one or more:
Options- A. chemical cells
- B. voltage generators
- C. solar cells
- D. piezoeletric cells
- E. None of the above Discuss
Correct Answer: chemical cells
- 2. Which one of the following devices is most often used for measuring opposition to current flow in a circuit?
Options- A. Ammeter
- B. Voltmeter
- C. Ohmmeter
- D. Wattmeter
- E. None of the above Discuss
Correct Answer: Ohmmeter
- 3. A dielectric material is:
Options- A. a good conductor
- B. a good insulator
- C. a poor conductor of electrostatic fields
- D. a good conductor of magnetic fields
- E. None of the above Discuss
Correct Answer: a good insulator
- 4. The rise time of a pulse waveform is the time required for the voltage to rise:
Options- A. from zero to its rms value
- B. from zero to its peak value
- C. from 10% of the peak value to 70.7% of the peak value
- D. from 10% of the peak value to 90% of the peak value
- E. None of the above Discuss
Correct Answer: from 10% of the peak value to 90% of the peak value
- 5. A device that converts mechanical into electrical energy is?
Options- A. solar cell
- B. thermocouple
- C. chemical cell
- D. generator
- E. None of the above Discuss
Correct Answer: generator
- 6. What is the capacitive reactance of a 0.1 micro F capacitor that is operating at 1000 Hz?
Options- A. less than 1 Ohm
- B. 1590 Ohm
- C. 312 Ohm
- D. 690 Ohm
- E. None of the above Discuss
Correct Answer: 1590 Ohm
- 7. A transformer has a primary voltage of 120 V rms and a secondary voltage of 25 V rms. If the secondary current is 1A rms, what is the primary current?
Options- A. 7.8 mA
- B. 208 mA
- C. 200 mA
- D. 300 mA
- E. None of the above Discuss
Correct Answer: 208 mA
- 8. Which one of the following statements is true for current flowing in a parallel circuit?
Options- A. The amount of current flow through each branch of a parallel circuit can be different, depending on the resistance of each branch part and the amount of voltage applied to it
- B. The same current always flows through every part of a parallel circuit
- C. The total current in a parallel circuit is equal to the total voltage multiplied by the total resistance
- D. The total current in a parallel circuit is always less than the smallest amount of current
- E. None of the above Discuss
Correct Answer: The amount of current flow through each branch of a parallel circuit can be different, depending on the resistance of each branch part and the amount of voltage applied to it
- 9. Suppose the zener diode has a breakdown voltage of 10 V and zener resistance of 8.5 W, what is the additional voltage when the current is 20 mA?
Options- A. 0.17 V
- B. 10.17 V
- C. 20 V
- D. 18.8 V
- E. None of the above Discuss
Correct Answer: 0.17 V
- 10. A high-pass filter:
Options- A. passes lower-frequency signals and reduces higher-frequency signals
- B. passes higher-frequency signals and reduces lower-frequency signals
- C. has no effect on ac signals
- D. increases the level of all frequencies by a significant amount
- E. None of the above Discuss
Correct Answer: passes higher-frequency signals and reduces lower-frequency signals
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