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- Question
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
- Correct Answer
- Magnetism that remains in the core of an electromagnet after the current through the coil is turned off
- 1. 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
- 2. 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
- 3. 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
- 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
- 5. 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
- 6. 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
- 7. 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
- 8. The equivalent of 1 micro A is:
Options- A. 10000A
- B. 1000 A
- C. one-millionth of an ampere
- D. one million amperes
- E. None of the above Discuss
- 9. Doubling the number of turns of wire in an inductor:
Options- A. reduces the value of inductance by one-half
- B. multiplies the value of inductance by two
- C. multiplies the value of inductance by four
- D. reduces the value of inductance by one-fourth
- E. None of the above Discuss
- 10. What is the phase shift between total current and voltage in the circuit of a 100 ohm resistor connected in parallel with a capacitor that has a reactance of 100 ohm
Options- A. 180 degree
- B. 30 degree
- C. 45 degree
- D. 75 degree
- E. None of the above Discuss
Electronic Principles problems
Search Results
Correct Answer: 0.955 A
Correct Answer: 410 Ohm
Correct Answer: 3.75 mA
Correct Answer: equal to 0.707 times the peak amplitude
Correct Answer: 1000 A
Correct Answer: Chemical energy
Correct Answer: changing the voltage on the plates at the rate of 1 V per second when 1 A of current is flowing
Correct Answer: one-millionth of an ampere
Correct Answer: multiplies the value of inductance by four
Correct Answer: 45 degree
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