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- Question
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
- Correct Answer
- 2.3 VAR
- 1. 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
- 2. The four factors determining inductance are the number of turns, coil length, coil area, and:
Options- A. permeability
- B. reluctance
- C. counter emf
- D. coefficient of coupling Discuss
- 3. When an electromagnet reaches maximum strength, it is considered to be:
Options- A. in field condition
- B. at saturation
- C. inhibited
- D. at field strength Discuss
- 4. In a B-H curve, magnetizing force is equal to:
Options- A.
- B. H = I × N
- C. ampere-turns per weber
- D. webers per square meter Discuss
- 5. As a generator armature passes the 270 degree point, the induced voltage is:
Options- A. at maximum negative
- B. between maximum negative and zero
- C. at maximum positive
- D. between zero and maximum positive Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. 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
Inductors problems
Search Results
Correct Answer: spacing between turns
Correct Answer: permeability
Correct Answer: at saturation
Correct Answer:
Correct Answer: at maximum negative
Correct Answer: an open
Correct Answer: induced voltage amplitude
Correct Answer: armature
Correct Answer: self-induction
Correct Answer: Type of core material, number of turns, cross-sectional area of core, and length of core
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