FREE AND STUDY GAMES ABOUT DC THEORY 28 EXAM

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FREE AND STUDY GAMES ABOUT DC THEORY 28 EXAM

QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -19 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: 3. If you know the direction of current flow in a conductor, how can you determine the direction of flux lines

Answer:

direction of fingers Question 2: 4. The strength of an electromagnetic field can be increased by increasing the ___ flowing through the conductor

Answer:

current

Question 3: 5. Draw magnetic fields

Answer:

page 276

Question 4: 14. Explain why soft iron is used for the core of an electromagnet

Answer:

High permeability, low reluctance will not become permanently magnetized

Question 5: 9. What measurement is used to denote the magnetic field strength of a coil or electromagnet

Answer:

ampere turns Question 6: 20. If a conductor is moving parallel with the flux lines, ___ volts will be induced

Answer:

Question 7: 7. When a current carrying conductor is wound in a coil, a magnetic field is produced that will have a __ and ___ pole

Answer:

north, south Question 8: 11. Adding a core of ferromagnetic material to the coil __ (increases/decreases) the number of flux lines passing through the center of the coil, thereby __(increasing/decreasing) the strength of the magnet

Answer:

increases, increasing Question 9: 2. Describe the left hand rule for determining the direction of the magnetic field when current flows through a conductor

Answer:

page 274 Question 10: 10. Wrapping the windings closer together will create a __ magnetic field

Answer:

stronger Question 11: 17. What causes electrons to move in a conductor that forms a complete circuit when the conductor is passed through a magnetic field

Answer:

interaction between the magnetic field and conductor

Question 12: 13. A concept of electromagnets is that it takes energy to __ a magnet but does not take energy to __ a magnet

Answer:

make, maintain Question 13: 16. How can the north and south poles of a coil or electromagnet be determined

Answer:

left hand coil Question 14: 8. Increasing the number of loops will increase the __ of the magnetic field

Answer:

strength Question 15: 19. In order for a magnetic field to induce a voltage into a conductor, there must be ___ between the two

Answer:

relative motion Question 16: 12. When a core is ___, there is no longer a change in the strength of the magnetic field when current through the coil is increased

Answer:

saturated Question 17: 6. Which of the pairs above will attract each other and which will repel

Answer:

C will repel Question 18: 1. When current flows through a conductor a ___ field is created that forms ___ circles radiating out from the conductor

Answer:

magnetic, concentric Question 19: 18. Changing the direction of the conductor passing through the flux lines will change the ___ of the current flow

Answer:

direction