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- Question
A transformer is used:
Options- A. to couple electric energy from one dc circuit to another
- B. to couple electric energy from an ac circuit to a dc circuit
- C. to couple electric energy from a dc circuit to an ac circuit
- D. to couple electric energy from one ac circuit to another
- Correct Answer
- to couple electric energy from one ac circuit to another
- 1. Faraday's law states that the:
Options- A. direction of the induced voltage produces an opposition
- B. direction of an induced current produces an aiding effect
- C. emf depends on the rate of cutting flux
- D. emf is related to the direction of the current Discuss
- 2. Find VR and VL.
Options- A. VR = 41.6 V, VL = 78.4 V
- B. VR = 48 V, VL = 110 V
- C. VR = 56 V, VL = 106 V
- D. VR = 60 V, VL = 60 V Discuss
- 3. What term is used to describe the action of magnetic flux from one circuit that cuts across the conductors of another circuit?
Options- A. self-inductance
- B. rectification
- C. mutual inductance
- D. magnetism Discuss
- 4. When used as a filter, an inductor is
Options- A. placed in series with the load and aids any current changes
- B. placed in parallel with the load and aids any current changes
- C. placed in parallel with the load and opposes any current changes
- D. placed in series with the load and opposes any current changes Discuss
- 5. A loaded transformer will achieve mutual induction when:
Options- A. secondary current increase causes a primary current decrease
- B. primary current is increased by an increase in secondary current
- C. primary current is decreased by an increase in secondary current
- D. secondary current decrease causes a primary current increase Discuss
- 6. The unit of flux density is:
Options- A. magnetomotive force
- B. a weber
- C. a maxwell
- D. a tesla Discuss
- 7. The time difference, or lag, between flux density and magnetizing force is known as:
Options- A. eddy current
- B. magnetic saturation
- C. hysteresis
- D. coercivity Discuss
- 8. The time required for one weber of flux to cut a conductor and produce one volt is:
Options- A. one revolution
- B. one second
- C. one millisecond
- D. four revolutions Discuss
- 9. If the primary of a 4:1 turns transformer dissipates 5 W, what is the secondary power?
Options- A. 5.0 W
- B. 1.25 pW
- C. 9.5 W
- D. 20.0 mW Discuss
- 10. A change of one ampere per second in an inductor that induces a voltage of one volt is considered as which unit value?
Options- A. a lenz
- B. an ohm
- C. a farad
- D. a henry Discuss
Inductors problems
Search Results
Correct Answer: emf depends on the rate of cutting flux
Correct Answer: VR = 56 V, VL = 106 V
Correct Answer: mutual inductance
Correct Answer: placed in series with the load and opposes any current changes
Correct Answer: primary current is increased by an increase in secondary current
Correct Answer: a tesla
Explanation:
tesla or weber/m2 is the unit of flux density
Correct Answer: hysteresis
Correct Answer: one second
Correct Answer: 5.0 W
Correct Answer: a henry
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