Electronic Principles problems
- 1. One henry of inductance is defined as:
Options- A. the amount of counter emf required to reduce a current to 1 A
- B. the amount of inductance required for generating 1 V of counter emf when the current changes at the rate of 1 A per second
- C. the amount of inductance required to change the frequency of a current by 1 Hz
- D. the number of turns of wire in an inductor multiplied by the amount of current flowing through it
- E. None of the above Discuss
Correct Answer: the amount of inductance required for generating 1 V of counter emf when the current changes at the rate of 1 A per second
- 2. A basic capacitor is composed of:
Options- A. two conductors separated by a dielectric
- B. two dielectrics separated by a conductor
- C. two coils separated by a dielectric
- D. two coils separated by a conductor
- E. None of the above Discuss
Correct Answer: two conductors separated by a dielectric
- 3. The transistor has a collector current of 2 mA. If the current gain is 135, what is the base current?
Options- A. 14.8 ľA
- B. 10.3 ľA
- C. 7.8 ľA
- D. 7.75 ľA
- E. None of the above Discuss
Correct Answer: 14.8 ľA
- 4. Which one of. the following phrases most accurately describes the nature of a pulsating dc voltage?
Options- A. The voltage remains at one polarity and at a steady level
- B. The voltage remains at one polarity but changes value periodically
- C. The voltage causes current to flow in two directions at the same time
- D. The voltage reverses polarity periodically
- E. None of the above Discuss
Correct Answer: The voltage remains at one polarity but changes value periodically
- 5. What is the impedance of a circuit composed of a 100 ohm resistor connected in parallel with an inductor that has a reactance of 200 W?
Options- A. 77.7 ohm
- B. 89.3 ohm
- C. 88.8 ohm
- D. 224 ohm
- E. None of the above Discuss
Correct Answer: 89.3 ohm
- 6. 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
Correct Answer: inductive reactance is equal to the capacitive reactance
- 7. 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
Correct Answer: their waveforms cross through zero and reach positive and negative peaks at the same time
- 8. 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
Correct Answer: Load resistance
- 9. 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
Correct Answer: The total current is less than the sum of the currents through the resistance and inductance
- 10. 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
Correct Answer: Reverse-biased
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