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- Question
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
- Correct Answer
- 1000 A
- 1. 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
- 2. 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
- 3. The number of free electrons and holes in intrinsic semiconductor increases when the temperature
Options- A. Decreases
- B. Increases
- C. Stays the same
- D. 0oC
- E. None of the above Discuss
- 4. Which one of the following is a direct statement of Ohm's law?
Options- A. The voltage drop across a resistance is proportional to the value of resistance and the amount of current flowing through it
- B. The total resistance of a parallel circuit is less than the value of the smallest resistance
- C. The algebraic sum of voltages in a loop is equal to zero
- D. The algebraic sum of currents entering and leaving a point is equal to zero
- E. None of the above Discuss
- 5. How many types of flow are there in a semiconductor?
Options- A. 0
- B. 1
- C. 2
- D. 3
- E. None of the above Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. 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
Electronic Principles problems
Search Results
Correct Answer: A diamagnetic material
Correct Answer: 100 Ohm or more
Correct Answer: Increases
Correct Answer: The voltage drop across a resistance is proportional to the value of resistance and the amount of current flowing through it
Correct Answer: 1
Correct Answer: equal to 0.707 times the peak amplitude
Correct Answer: 3.75 mA
Correct Answer: 410 Ohm
Correct Answer: 0.955 A
Correct Answer: Magnetism that remains in the core of an electromagnet after the current through the coil is turned off
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