Electronic Principles problems
- 1. Which is the most widely used semiconductor?
Options- A. Copper
- B. Silicon
- C. Germanium
- D. All of the above
- E. None of the above Discuss
Correct Answer: Silicon
- 2. Which one of the following statements is true?
Options- A. Power dissipation of a pure inductor decreases with operating frequency
- B. Power dissipation of a pure inductor is at a maximum for dc source voltages
- C. Power dissipation of a pure inductor increases with operating frequency
- D. There is no meaningful relationship between the power dissipation of a pure inductor and its operating frequency
- E. None of the above Discuss
Correct Answer: There is no meaningful relationship between the power dissipation of a pure inductor and its operating frequency
- 3. How much power is being dissipated by a 1000 W resistance that has 25 V applied to it?
Options- A. 0.24 W
- B. 0.625 W
- C. 80 W
- D. 325 kW
- E. None of the above Discuss
Correct Answer: 0.625 W
- 4. Current can flow through a normally open push button switch as long as:
Options- A. you are pressing the button
- B. you are not pressing the button
- C. its contact remain open
- D. its contact remain open
- E. None of the above Discuss
Correct Answer: you are not pressing the button
- 5. The transistor has a current gain of 175. If the base current is 0.1 mA, what is the collector current?
Options- A. 1750 mA
- B. 17.5 mA
- C. 175 mA
- D. 1.75 mA
- E. None of the above Discuss
Correct Answer: 17.5 mA
- 6. An intrinsic semiconductor has some holes in it at room temperature. What causes these holes?
Options- A. Doping
- B. Valence electrons
- C. Free electrons
- D. Thermal energy
- E. None of the above Discuss
Correct Answer: Thermal energy
- 7. When operating above its resonant frequency, a parallel RLC circuit has the characteristics of a:
Options- A. parallel RL circuit
- B. parallel RC circuit
- C. parallel RLC circuit operated above its resonant frequency
- D. purely resistive circuit
- E. None of the above Discuss
Correct Answer: parallel RC circuit
- 8. A circuit has two different voltage sources that are connected in a series-aiding form. If the sources are rated at 6 V and 9 V, what is the total source voltage?
Options- A. 15 V
- B. 16 V
- C. 7.5 V
- D. 8 V
- E. None of the above Discuss
Correct Answer: 15 V
- 9. An unloaded zener regulator has a source voltage of 20 V, a series resistance of 330 W, and a zener voltage of 12 V, What is the Zener current?
Options- A. 28.4 mA
- B. 24.2 mA
- C. 34.4 mA
- D. 68.4 mA
- E. None of the above Discuss
Correct Answer: 24.2 mA
- 10. Doubling the operating frequency of a purely capacitive circuit:
Options- A. has no effect on the total circuit current
- B. doubles the amount of total current
- C. cuts the total current by one-half
- D. thrice the amount of total current
- E. None of the above Discuss
Correct Answer: doubles the amount of total current
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