Electronic Principles problems
- 1. A flashlight battery has internal resistance of 1W. For what values of load resistance does the flashlight battery appear stiff?
Options- A. 60 Ohm
- B. 50 Ohm
- C. 100 Ohm or more
- D. 10 Ohm
- E. None of the above Discuss
Correct Answer: 100 Ohm or more
- 2. Which one of the following kinds of materials has the lowest permeability?
Options- A. A diamagnetic material
- B. A paramagnetic material
- C. A feiTomagnetic material
- D. All of the above
- E. None of the above Discuss
Correct Answer: A diamagnetic material
- 3. A certain electromagnet has 1000 turns of wire. How much current must flow through the coil in order to generate an mmf of 100 ampere-turns?
Options- A. 0.1 A
- B. 1000 A
- C. 10 A
- D. 100 A
- E. None of the above Discuss
Correct Answer: 1000 A
- 4. The rms value of a sine waveform is:
Options- A. the number of cycles completed in one second
- B. the time required to complete one full cycle
- C. equal to 0.707 times the peak amplitude
- D. equal to 1.41 times the peak amplitude
- E. None of the above Discuss
Correct Answer: equal to 0.707 times the peak amplitude
- 5. A transistor has a current gain of 125 and a base current of 30 µA. What is the collector current?
Options- A. 3.75 mA
- B. 3.2 mA
- C. 0.05 mA
- D. 13 mA
- E. None of the above Discuss
Correct Answer: 3.75 mA
- 6. A zener regulator has an input voltage from 15 to 20 V and a load current from 5 to 20 mA. If the zener voltage is 6.8 V, what value should the series resistor have?
Options- A. 310 Ohm
- B. 400 Ohm
- C. 410 Ohm
- D. 550 Ohm
- E. None of the above Discuss
Correct Answer: 410 Ohm
- 7. How much current flows through a 0.02-H choke that is operating from a 12-V ac, 100-Hz source?
Options- A. 0.02 A
- B. 0.955 A
- C. 10 A
- D. 2.02 A
- E. None of the above Discuss
Correct Answer: 0.955 A
- 8. Which one of the following phrases best describes residual magnetism?
Options- A. Magnetism that remains in the core of an electromagnet after the current through the coil is turned off
- B. The force of attraction between the poles of a permanent and temporary magnetic field
- C. The amount of magnetic flux that is not confined to the core material of an electromagnet
- D. The circular magnetic field that surrounds a conductor carrying a current
- E. None of the above Discuss
Correct Answer: Magnetism that remains in the core of an electromagnet after the current through the coil is turned off
- 9. What form of energy is used to maintain an imbalance of charges between the terminals of a battery?
Options- A. Electronical energy
- B. Mechanical energy
- C. Chemical energy
- D. Solar energy
- E. None of the above Discuss
Correct Answer: Chemical energy
- 10. A farad is defined as the amount of capacitance necessary for:
Options- A. dissipating 1 W of power
- B. causing an ac phase shift greater than 90 degree
- C. storing 1 V for 1 second
- D. changing the voltage on the plates at the rate of 1 V per second when 1 A of current is flowing
- E. None of the above Discuss
Correct Answer: changing the voltage on the plates at the rate of 1 V per second when 1 A of current is flowing
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