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- Question
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
- Correct Answer
- Ohmmeter
- 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
- 2. The total impedance of a parallel RLC circuit:
Options- A. always increases as the applied frequency increases
- B. is equal to the sum of the values of resistance, inductive reactance and capacitive reactance
- C. always decreases as the applied frequency increases
- D. is maximum at the resonant frequency
- E. None of the above Discuss
- 3. Which one of the following phrases most accurately describes a purely inductive circuit?
Options- A. Resistances provide the only opposition to current flow
- B. Inductive reactance provides the only opposition to current flow
- C. Combinations of resistance and inductive reactance provide any opposition to current flow
- D. The ac voltage lags the current by 90 degree
- E. None of the above Discuss
- 4. Household light bulbs have a given power rating, and they operate at 120 V. Which one of the following equations most directly provides the current rating of these light bulbs?
Options- A. P = I2R
- B. P = IE
- C. P = E2/R
- D. I = P/E
- E. None of the above Discuss
- 5. Molecule is
Options- A. The smallest particle of a substance that retains the properties of that substance
- B. A atom that has a shortage of electrons in its outer orbit
- C. A atom that has an excessive number of electrons in its outer orbit
- D. A atom that flows whenever there is an imbalance of electrical charges between two points
- E. None of the above Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. 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
Electronic Principles problems
Search Results
Correct Answer: chemical cells
Correct Answer: is maximum at the resonant frequency
Correct Answer: Inductive reactance provides the only opposition to current flow
Correct Answer: I = P/E
Correct Answer: The smallest particle of a substance that retains the properties of that substance
Correct Answer: a good insulator
Correct Answer: from 10% of the peak value to 90% of the peak value
Correct Answer: generator
Correct Answer: 1590 Ohm
Correct Answer: 208 mA
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