Discussion
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- Question
Suppose a step-down transformer has a turns ration of 5:1. If the secondary current is 1A rms, what is the primary-current?
Options- A. 0.3 A
- B. 0.2 A
- C. 0.4 A
- D. 0.6 A
- E. None of the above
- Correct Answer
- 0.2 A
- 1. Which one of the following statements is true?
Options- A. Capacitive reactance is at a minimum for dc source voltages
- B. Capacitive reactance decreases as the operating frequency increases
- C. There is no meaningful relationship between capacitive reactance and operating frequency
- D. Capacitive reactance increases as the operating frequency increases
- E. None of the above Discuss
- 2. To get the Norton current, you have to
Options- A. Short the load resistor
- B. Open the load resistor
- C. Short the voltage source
- D. Open the voltage source
- E. None of the above Discuss
- 3. Which one of the following kinds of materials has the highest permeability?
Options- A. A diamagnetic material
- B. A ferromagnetic material
- C. A paramagnetic material
- D. All of the above
- E. None of the above Discuss
- 4. At cut off, the Q point is at
Options- A. upper end of the load line
- B. middle of the load line
- C. lower end of the load line
- D. infinity
- E. None of the above Discuss
- 5. The barrier potential accross each depletion layer is
Options- A. 0
- B. 0.8 V
- C. 0.7 V
- D. 20 V
- E. None of the above Discuss
- 6. How much current flows through a 60-W light bulb that is operating at 120 V?
Options- A. 0.5A
- B. 180 A
- C. 2 A
- D. 7200 A
- E. None of the above Discuss
- 7. Which one of the following properties of a magnetic circuit can be directly compared to voltage in an electrical circuit?
Options- A. Flux density
- B. Number of lines of force
- C. Magnetomotive force
- D. Reluctance
- E. None of the above Discuss
- 8. What is the primary difference between primary and secondary cell batteries?
Options- A. Primary-cell batteries can be recharged and used many times, whereas secondary-cell batteries cannot be properly recharged
- B. Secondary-cell batteries can be recharged and used many times, whereas primary-cell batteries cannot be properly recharged
- C. Primary-cell batteries use chemical cells, whereas secondary-cell batteries use an alternative energy source, such as thermal or magnetic energy, to supplement their outputs
- D. Primary-cell batteries must be recharged at a much slower rate that secondary-cell batteries
- E. None of the above Discuss
- 9. The secondary voltage for a certain power transformer is twice the voltage applied to the primary. The current flowing in the secondary winding will be:
Options- A. One-half the primary current
- B. Same as the primary current
- C. Twice the primary current
- D. No more than 10% less than the primary current
- E. None of the above Discuss
- 10. Which one of the following statements is true for resistance in a parallel circuit?
Options- A. The total resistance is equal to the sum of the individual resistances in a parallel circuit.
- B. The total resistance of a parallel circuit is always less than the value of the smallest resistance
- C. The total resistance of a parallel circuit is equal to the total voltage
- D. The total resistance in a parallel circuit is equal to the average value of the individual resistances
- E. None of the above Discuss
Electronic Principles problems
Search Results
Correct Answer: Capacitive reactance decreases as the operating frequency increases
Correct Answer: Short the voltage source
Correct Answer: A ferromagnetic material
Correct Answer: lower end of the load line
Correct Answer: 0.7 V
Correct Answer: 0.5A
Correct Answer: Magnetomotive force
Correct Answer: Secondary-cell batteries can be recharged and used many times, whereas primary-cell batteries cannot be properly recharged
Correct Answer: One-half the primary current
Correct Answer: The total resistance of a parallel circuit is always less than the value of the smallest resistance
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