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- Question
Current will cause a magnetic field in a conductor as follows:
Options- A. An ac current causes a fixed polarity magnetic field.
- B. A dc current causes a fixed polarity magnetic field.
- C. A dc current causes an alternating magnetic field.
- D. An ac current causes a fixed polarity magnetic field and a dc current causes an alternating magnetic field.
- Correct Answer
- A dc current causes a fixed polarity magnetic field.
- 1. Electromagnetic induction is the generation of:
Options- A. electricity from magnetism
- B. electricity from electricity
- C. magnetism from electricity
- D. magnetism from magnetism Discuss
- 2. What is the approximate time for a complete decay of 400 mA of inductor current, when R = 10 ohms and L = 20 H?
Options- A. 10 seconds
- B. 8 seconds
- C. 4 seconds
- D. 2 seconds Discuss
- 3. What is the permeability of machine steel?
Options- A. 1.1 x 10?4
- B. 5.65 x 10?4
- C. 6.9 x 10?3
- D. 8.8 x 10?3 Discuss
- 4. Electricity may be generated by a wire:
Options- A. carrying current
- B. wrapped as a coil
- C. that has neutral domains
- D. passing through a flux field Discuss
- 5. Fixed transformers have:
Options- A. a center-tapped secondary
- B. multiple windings
- C. turns ratios that cannot be changed
- D. a multiple-tapped secondary Discuss
- 6.
What is the total inductance in the given circuit?
Options- A. 160 mH
- B. 300 mH
- C. 900 mH
- D. 1700 mH Discuss
- 7. With a square wave input, an RL differentiator circuit with an output across the inductor will produce what type of waveform?
Options- A. dc
- B. short time-duration pulses
- C. exponential-shaped pulses
- D. only a phase shift Discuss
- 8. When a load is not connected to the secondary of a transformer:
Options- A. primary current is zero
- B. primary current is inversely proportional to primary impedance
- C. secondary voltage is zero
- D. secondary voltage is proportional to primary impedance Discuss
- 9. When a coil collapses the induced circuit current will:
Options- A. be in the same direction
- B. go to zero
- C. aid counter emf buildup
- D. be in the opposite direction Discuss
- 10. What will happen when an inductor's magnetic field collapses?
Options- A. Current will double.
- B. Voltage will be induced.
- C. A new field will expand.
- D. Counter emf will be high. Discuss
Inductors problems
Search Results
Correct Answer: electricity from magnetism
Correct Answer: 10 seconds
Correct Answer: 5.65 x 10?4
Correct Answer: passing through a flux field
Correct Answer: turns ratios that cannot be changed
Correct Answer: 160 mH
Correct Answer: short time-duration pulses
Correct Answer: primary current is inversely proportional to primary impedance
Correct Answer: be in the same direction
Correct Answer: Voltage will be induced.
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