Discussion
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- Question
Which transformer turns ratio is needed to match two 16-ohm parallel devices to an output of 22.2 ohms?
Options- A. 1.38:1
- B. 1.67:1
- C. 0.72:1
- D. 0.60:1
- Correct Answer
- 0.60:1
- 1. A practical inductor
Options- A. has inductance
- B. has winding resistance
- C. has winding capacitance
- D. all of the above Discuss
- 2. The output phase for a transformer is:
Options- A. in phase with the input
- B. out of phase with the input
- C. dependent on the direction of the primary and secondary windings
- D. dependent on the frequency of the primary source Discuss
- 3. When the transformer secondary is not loaded:
Options- A. secondary voltage increases
- B. no secondary current flows
- C. no secondary voltage is present
- D. secondary current increases Discuss
- 4. The electrical energy consumed by a coil is stored in the form of:
Options- A. an electrical field
- B. a force field
- C. an electrostatic field
- D. a magnetic field Discuss
- 5. What is the current rise after 2 time constants if Vs = 12 V dc, R = 60 Ω, and the inductor is rated at 24 mH?
Options- A. 79.9 mA
- B. 126.4 mA
- C. 173.0 mA
- D. 198.6 mA Discuss
- 6. When current in an inductor starts to change, it cannot react instantly due to:
Options- A. fixed coil resistance
- B. eddy current generation
- C. applied emf of the circuit
- D. the counter emf of the coil Discuss
- 7. What is the phase angle of a 24 Vac parallel RL circuit when R = 45 ohms and XL = 1100 ohms?
Options- A. 0.001 degrees
- B. 2.300 degrees
- C. 87.600 degrees
- D. 89.900 degrees Discuss
- 8. On a schematic, dashed lines between two vertical coils usually mean the transformer has:
Options- A. an air core
- B. an iron core
- C. a nonmetallic core
- D. a ferrite core Discuss
- 9. The polarity of induced voltage while a field is collapsing is:
Options- A. independent of the force creating it
- B. opposite to the force creating it
- C. identical to the force creating the field
- D. present only if the force is stationary Discuss
- 10. What is the number of turns required in the secondary winding for a transformer when 120 volts is applied to a 2400-turn primary to produce 7.5 Vac at the secondary?
Options- A. 75 turns
- B. 150 turns
- C. 900 turns
- D. 1920 turns Discuss
Inductors problems
Search Results
Correct Answer: all of the above
Correct Answer: dependent on the direction of the primary and secondary windings
Correct Answer: no secondary current flows
Correct Answer: a magnetic field
Correct Answer: 173.0 mA
Correct Answer: the counter emf of the coil
Correct Answer: 2.300 degrees
Correct Answer: a ferrite core
Correct Answer: opposite to the force creating it
Correct Answer: 150 turns
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