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- Question
The core of an electromagnet is said to be in saturation when:
Options- A. the core is permitted to move freely within the coil
- B. an increase in current through the coil causes no further increase in the mmf
- C. frequent changes in the direction of current through the coil causes heating effects in the core material
- D. changing the polarity of the current in the coil changes the polarity of the magnetic field around the core
- E. None of the above
- Correct Answer
- an increase in current through the coil causes no further increase in the mmf
- 1. A device that converts chemical energy to electrical energy is called a:
Options- A. solar cell
- B. thermocouple
- C. chemical cell
- D. electric device
- E. None of the above Discuss
- 2. Which one of the following statements is true?
Options- A. The secondary voltage for a step-down power transformer is greater than the primary voltage
- B. The secondary current for a step-down power transformer is greater than the primary voltage
- C. Parallel RLC circuit operated below its resonant frequency
- D. purely resistive circuit
- E. None of the above Discuss
- 3. Doubling the diameter of the coil in an inductor:
Options- A. multiplies the value of inductance by two
- B. reduces the value of inductance by one-half
- C. reduces the value of inductance by one-fourth
- D. multiplies the value of inductance by four
- E. None of the above Discuss
- 4. A circuit has a Norton current of 10 mA and a Norton resistance of 10 kW. What is the Thevenin circuit?
Options- A. 1000 V and a series resistance of 10 k Ohm
- B. 100 V and a parallel resistance of 10 k Ohm
- C. 100 V and a series resistance of 10 k Ohm
- D. 1000 V and a parallel resistance of 10 kOhm
- E. None of the above Discuss
- 5. What is the impedance of a circuit composed of a 100 ohm resistor connected in parallel with a capacitor that has a reactance of 100 ohm?
Options- A. 60 Ohm
- B. 99.3 Ohm
- C. 250 Ohm
- D. 70.7Ohm
- E. None of the above Discuss
- 6. Which one of the following statements is true?
Options- A. Power dissipation of a pure capacitor increases with operating frequency
- B. Power dissipation of a pure capacitor decreases with operating frequency
- C. There is no meaningful relationship between the power dissipation of a pure capacitor and its operating frequency
- D. All of the above
- E. None of the above Discuss
- 7. As the temperature increases, the current gain
Options- A. increases
- B. decreases
- C. contant
- D. can be any of the above
- E. None of the above Discuss
- 8. If the base supply voltage increases, the Q point moves
Options- A. down
- B. up
- C. nowhere
- D. off the load line
- E. None of the above Discuss
- 9. Suppose the voltage from a power outlet is 120 Vrms. What is the peak voltage?
Options- A. 100 V
- B. 120 V
- C. 170 V
- D. 180 V
- E. None of the above Discuss
- 10. The emitter diode is usually
Options- A. Forward-biased
- B. Reverse-biased
- C. Nonconducting
- D. Operating in the breakdwon region
- E. None of the above Discuss
Electronic Principles problems
Search Results
Correct Answer: chemical cell
Correct Answer: The secondary current for a step-down power transformer is greater than the primary voltage
Correct Answer: multiplies the value of inductance by two
Correct Answer: 100 V and a series resistance of 10 k Ohm
Correct Answer: 70.7Ohm
Correct Answer: There is no meaningful relationship between the power dissipation of a pure capacitor and its operating frequency
Correct Answer: increases
Correct Answer: down
Correct Answer: 170 V
Correct Answer: Forward-biased
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