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- Question
The primary impedance of a transformer is 60 ohm and the secondary impedance is 120 ohm. What is the impedance ratio?
Options- A. 0.25
- B. 180
- C. 0.5
- D. 4
- E. None of the above
- Correct Answer
- 0.5
- 1. For normal operation of the transistor, the collector diode has to be
Options- A. Forward-biased
- B. Reverse-biased
- C. Nonconducting
- D. Operating in the breakdown region
- E. None of the above Discuss
- 2. Which one of the following statements is true for the currents in a parallel RL circuit?
Options- A. The total current is equal to the sum of the currents through the resistance and inductance
- B. The current always has the same amplitude and phase for every part of the circuit
- C. The total current is less than the sum of the currents through the resistance and inductance
- D. The total current leads the total voltage by less than 90
- E. None of the above Discuss
- 3. The Thevenin resistance is equal in value to the
Options- A. Load resistance
- B. Half the load resistance
- C. Internal resistance of a Morton circuit
- D. Open-load resistance
- E. None of the above Discuss
- 4. Current and voltage are said to be in phase when:
Options- A. their waveforms are both ac or both dc
- B. they have the same amplitude and frequency
- C. their waveforms cross through zero and reach positive and negative peaks at the same time
- D. All of the above
- E. None of the above Discuss
- 5. When a parallel 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
- 6. Most AC power is obtained from:
Options- A. generators
- B. batteries
- C. oscillators
- D. lightning
- E. None of the above Discuss
- 7. The direction of electron current flow is:
Options- A. from right to left
- B. from positive to negative
- C. from negative to positive
- D. from neutral to positive
- E. None of the above Discuss
- 8. Which one of the following principles best describes the basic operation of an electromagnet?
Options- A. Current is induced in a conductor that is moving through a magnetic field
- B. Like magnetic poles repel, while unlike poles attract
- C. Current flowing through a conductor generates a magnetic field
- D. Like magnetic poles attract, while unlike poles repel
- E. None of the above Discuss
- 9. A current source has an internal resistance of 100 kW. What is the largest load resistance if the current source must appear stiff?
Options- A. 2 k Ohm
- B. 10 k Ohm
- C. 20 k Ohm
- D. 1 k Ohm
- E. None of the above Discuss
- 10. Which one of the following devices is most often used for measuring electrical potential difference?
Options- A. Voltmeter
- B. Ohmmeter
- C. Ammeter
- D. Wattmeter
- E. None of the above Discuss
Electronic Principles problems
Search Results
Correct Answer: Reverse-biased
Correct Answer: The total current is less than the sum of the currents through the resistance and inductance
Correct Answer: Load resistance
Correct Answer: their waveforms cross through zero and reach positive and negative peaks at the same time
Correct Answer: inductive reactance is equal to the capacitive reactance
Correct Answer: oscillators
Correct Answer: from negative to positive
Correct Answer: Current flowing through a conductor generates a magnetic field
Correct Answer: 1 k Ohm
Correct Answer: Voltmeter
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