Discussion
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- Question
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
- Correct Answer
- self-induction
- 1. What is the name of the part inside a relay that is moved by the action of the electromagnet?
Options- A. armature
- B. conductor
- C. contacts
- D. solenoid Discuss
- 2. A henry value divided by a circuit resistive value provides the:
Options- A. counter emf value
- B. induced voltage amplitude
- C. rise or decay time constant
- D. quality factor of the coil Discuss
- 3. An inductor is in series with a voltage source, an open switch, and a resistor. The instant the switch is closed, the inductor acts like
Options- A. a short
- B. an open
- C. a resistor
- D. a voltage source Discuss
- 4. A 24 V peak source is connected across a 900 µH inductor. If the frequency of the source is 22 kHz, what is the reactive power?
Options- A. 2.3 VAR
- B. 4.6 VAR
- C. 9.3 VAR
- D. 0 VAR Discuss
- 5. If you wanted to decrease the inductance of a coil, you might increase the:
Options- A. number of turns
- B. permeability of the core
- C. spacing between turns
- D. area of the coil Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. 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
Inductors problems
Search Results
Correct Answer: armature
Correct Answer: induced voltage amplitude
Correct Answer: an open
Correct Answer: 2.3 VAR
Correct Answer: spacing between turns
Correct Answer: Type of core material, number of turns, cross-sectional area of core, and length of core
Correct Answer: more secondary turns than primary turns
Correct Answer: primary and secondary windings
Correct Answer: lag between cause and effect
Correct Answer: 167 mA
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