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- Question
A step-down transformer has turns ration of 5:1. If the primary voltage is 120 Vrms, what is the secondary voltage?
Options- A. 12 V
- B. 18 V
- C. 24 V
- D. 30 V
- E. None of the above
- Correct Answer
- 24 V
- 1. Doubling the operating frequency of a capacitive circuit:
Options- A. doubles the amount of a capacitive reactance
- B. has no effect on the capacitive reactance
- C. cuts the capacitive reactance in half
- D. multiplies the capacitive reactance by 6.28
- E. None of the above Discuss
- 2. When operating below 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
- 3. When a series RLC circuit is operating at its resonant frequency:
Options- A. capacitive reactance is greater than the inductive reactance
- B. inductive reactance is greater than the capacitive reactance
- C. inductive reactance is equal to the capacitive reactance
- D. the difference between inductive and capacitive reactance is equal to the resistance
- E. None of the above Discuss
- 4. What is one important thing transistors do?
Options- A. Emit light
- B. Amplify weak signals
- C. Regulate voltage
- D. Rectify line voltage
- E. None of the above Discuss
- 5. A low-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. reduces the level of all frequencies by a significant amount
- E. None of the above Discuss
- 6. Which one of the following statements applies to common, non-rechargeable flashlight batteries?
Options- A. Common flashlight batteries are secondary wet-cell batteries
- B. Common flashlight batteries are primary wet-cell batteries
- C. Common flashlight batteries are primary dry-cell batteries
- D. Common flashlight batteries are secondary dry-cell batteries
- E. None of the above Discuss
- 7. Holes act like:
Options- A. Atoms
- B. Crystals
- C. Negative charges
- D. Positive charges
- E. None of the above Discuss
- 8. Which one of the following statements most accurately reflects the nature of ac power?
Options- A. The current in an ac circuit flows in one direction, but changes value periodically
- B. The current in an ac circuit flows in one direction at a steady level
- C. The current in an ac circuit changes direction periodically
- D. The current in an ac circuit flows in two directions at the same time
- E. None of the above Discuss
- 9. The period of a waveform is:
Options- A. the time required to complete one full cycle
- B. the number of cycles completed in one second
- C. the time required for the voltage to rise from 10% to 90% of the peak amplitude
- D. equal to 0.707 times the peak amplitude
- E. None of the above Discuss
- 10. The current gain of a transistor is defined as the ratio of the collector current to the
Options- A. base current
- B. emitter current
- C. supply current
- D. collector current
- E. None of the above Discuss
Electronic Principles problems
Search Results
Correct Answer: cuts the capacitive reactance in half
Correct Answer: parallel RL circuit
Correct Answer: inductive reactance is equal to the capacitive reactance
Correct Answer: Amplify weak signals
Correct Answer: passes lower-frequency signals and reduces higher-frequency signals
Correct Answer: Common flashlight batteries are primary dry-cell batteries
Correct Answer: Positive charges
Correct Answer: The current in an ac circuit changes direction periodically
Correct Answer: the time required to complete one full cycle
Correct Answer: base current
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