Discussion
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- Question
Which two values are plotted on a B-H curve graph?
Options- A. reluctance and flux density
- B. permeability and reluctance
- C. magnetizing force and permeability
- D. flux density and magnetizing force
- Correct Answer
- flux density and magnetizing force
- 1. Find IR and IL.
Options- A. IR = 50 mA, IL = 109 mA
- B. IR = 150 mA, IL = 9 mA
- C. IR = 50 mA, IL = 151 mA
- D. IR = 150 mA, IL = 53 mA Discuss
- 2. What happens when moving expanding lines of force encounter a conductor?
Options- A. Current increases.
- B. Voltage is induced.
- C. Resistance is reduced.
- D. Power is increased. Discuss
- 3. If 360 Vac is the output of a 300-turn secondary winding, what is the input voltage when the primary winding has 150 turns?
Options- A. 2.4 Vac
- B. 150 Vac
- C. 180 Vac
- D. 720 Vac Discuss
- 4. A magnetic field has:
Options- A. polar fields
- B. lines of force
- C. magnetomotive force
- D. lines of reluctance Discuss
- 5. When a rate of one ampere per second causes an induced voltage of one volt, the unit of measure is
Options- A. a lenz
- B. an ohm
- C. a farad
- D. a henry Discuss
- 6. A utility pole transformer used to supply a residential customer with two phases uses:
Options- A. two phases on the primary
- B. a center tap on the secondary
- C. a separate ground for each phase
- D. a small coefficient of coupling Discuss
- 7. A winding of wire can be called
Options- A. an inductor
- B. a coil
- C. a choke
- D. All of the above Discuss
- 8. Counter emf or induced voltage is:
Options- A. inversely proportional to the change in current
- B. directly proportional to the change in time
- C. directly proportional to the inductance in henrys
- D. inversely proportional to the inductance in henrys Discuss
- 9. What is the phase angle between the source voltage and current, when a 100 mH inductor with a reactance of 6 kΩ, and a 1 kΩ resistor are in series with a source?
Options- A. 0.1 degrees
- B. 9.0 degrees
- C. 61.0 degrees
- D. 81.0 degrees Discuss
- 10. In a purely inductive circuit,
Options- A. current leads voltage by 90°
- B. voltage lags current by 90°
- C. voltage leads current by 90°
- D. voltage and current are in phase (0°) Discuss
Inductors problems
Search Results
Correct Answer: IR = 150 mA, IL = 53 mA
Correct Answer: Voltage is induced.
Correct Answer: 180 Vac
Correct Answer: lines of force
Correct Answer: a henry
Correct Answer: a center tap on the secondary
Correct Answer: All of the above
Correct Answer: directly proportional to the inductance in henrys
Correct Answer: 81.0 degrees
Correct Answer: voltage leads current by 90°
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