Electronic Principles problems
- 1. When the collector current increases, what does the current gain do?
Options- A. decreases
- B. stays the same
- C. increases
- D. any of the above
- E. None of the above Discuss
Correct Answer: increases
- 2. The transistor has a collector current of 10 mA and a base current of 40 mA. What is the current gain of the transistor?
Options- A. 250 ?A
- B. 350 ?A
- C. 0.25 ?A
- D. 300 ?A
- E. None of the above Discuss
Correct Answer: 250 ?A
- 3. What form of energy is used for creating static electricity?
Options- A. Solar energy
- B. Mechanical energy
- C. Chemical energy
- D. Light energy
- E. None of the above Discuss
Correct Answer: Light energy
- 4. Which one of the following statements best applies to a parallel RLC circuit?
Options- A. The voltage waveform for each component always has the same amplitude and phase as the applied voltage
- B. The sum of the current is always less than the applied current
- C. The current waveform for each component always has the same amplitude and phase as the applied current
- D. All of the above
- E. None of the above Discuss
Correct Answer: The voltage waveform for each component always has the same amplitude and phase as the applied voltage
- 5. Which one of the following statements best describes magnetic hysteresis?
Options- A. Hysteresis is the amount of magnetic flux that is not confined to the core material of an electromagnet
- B. Hysteresis is most apparent when a steady amount of current is lowing through the coil of an electromagnet
- C. Hysteresis is most apparent when the current through the coil of an electromagnet changes frequently
- D. Hysteresis is most apparent when the core material is saturated
- E. None of the above Discuss
Correct Answer: Hysteresis is most apparent when the current through the coil of an electromagnet changes frequently
- 6. The total inductance of a series inductor circuit is:
Options- A. equal to the sum of the individual inductance values
- B. equal to the sum of the individual inductive-reactance values
- C. less than the value of the smallest inductor
- D. equal to the source voltage divided by total current
- E. None of the above Discuss
Correct Answer: equal to the sum of the individual inductance values
- 7. 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
Correct Answer: The smallest particle of a substance that retains the properties of that substance
- 8. 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
Correct Answer: I = P/E
- 9. 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
Correct Answer: Inductive reactance provides the only opposition to current flow
- 10. 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
Correct Answer: is maximum at the resonant frequency
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