Inductors problems
- 1. During a current change, the ability of a conductor to produce counter emf within itself is called:
Options- A. back emf
- B. self-induction
- C. a henry
- D. impedance Discuss
Correct Answer: self-induction
- 2. What are the properties that determine the inductance of a coil?
Options- A. Length of wire, number of turns, type of core material, length of core
- B. Number of turns, type of wire, length of core, and cross-sectional area of core
- C. Type of core material, number of turns, cross-sectional area of core, and length of core
- D. Type of core material, type of wire, number of turns, and cross-sectional area of core Discuss
Correct Answer: Type of core material, number of turns, cross-sectional area of core, and length of core
- 3. A turns ratio of 5 for a transformer implies:
Options- A. more primary turns than secondary turns
- B. more secondary current than primary current
- C. larger source impedance than load impedance
- D. more secondary turns than primary turns Discuss
Correct Answer: more secondary turns than primary turns
- 4. A transformer will have:
Options- A. primary and secondary windings
- B. primary and secondary current
- C. primary wattage producing secondary current
- D. different frequencies for the primary and secondary Discuss
Correct Answer: primary and secondary windings
- 5. What is hysteresis?
Options- A. lead between cause and effect
- B. lag between cause and effect
- C. lead between voltage and current
- D. lag between voltage and current Discuss
Correct Answer: lag between cause and effect
- 6. With 100 Vac applied to the primary of a transformer so that it draws 500 mA, what will be the 300 Vac secondary current?
Options- A. 1500 mA
- B. 200 mA
- C. 167 mA
- D. 150 mA Discuss
Correct Answer: 167 mA
- 7. Which of the following is NOT one of the three major types of fixed inductor?
Options- A. air core
- B. ferrite core
- C. magnesium core
- D. iron core Discuss
Correct Answer: magnesium core
- 8. Opposition to current flow without the dissipation of energy is called:
Options- A. resistance
- B. inductive reactance
- C. counter emf
- D. impedance Discuss
Correct Answer: inductive reactance
- 9. What is the permeability of transformer iron?
Options- A. 50
- B. 450
- C. 1,500
- D. 5,500 Discuss
Correct Answer: 5,500
- 10. A series RL filter circuit with an output across the inductor will result in what type of filtering?
Options- A. passing of the higher frequencies
- B. passing of the lower frequencies
- C. blocking of the higher frequencies
- D. blocking of a certain range of frequencies Discuss
Correct Answer: passing of the higher frequencies
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