Test your basic knowledge |

Transformers

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. closed core with a top and bottom. It directs the magnetic field towards the primary and secondary coils and increases the field stregnth






2. Hysteresis Loss can be reduced by using a core with this feature






3. Determines if the transformer is a step up or step down transformer






4. Kind of wire is the secondary coil in a transformer






5. The simplest type of transformer core






6. A choke coil uses this to induce current






7. What does transformer efficiency mean?






8. Current flows through the primary winding in response to primary voltage and sets up a magnetic field that varies in direction and stregnth. under the influence of the changing magnetic field an AC voltage/kv is induced across the secondary coil by e






9. The 4 types of transformer cores






10. This type of core is moderately efficient due to closing the core and layering design which reduces power loss from less leakage flux which provides a continuous path for magnetic flux and an increase in field strength






11. Refers to the transformer's ability to avoid power loss (heat)






12. The formula for the voltage related to turns ratio






13. The turns ratio between the windings (primary & secondary) of a transformer unless otherwise specified.






14. This is the most advanced and most efficient type of tansformer; it is commonly used in x-ray equipment






15. Is concentrated in the metal core






16. For a step up and step down transformer if the turns ratio is constant this is the only way to change the output voltage






17. Central magnetic core made of






18. Defined as the ratio of the power output to the power input (in a closed circuit containing resistance)






19. An instrument used to measure electrical current.






20. Both the primary and secondary coils in a transformer are arranged around this






21. A transformer is a device that has no moving parts and that transfers energy from one circuit to another by _____.






22. The transformer winding to which the load is connected is called the _____ winding.






23. Instrument transformers reduce high voltages and currents to safe - usable values for the operation of _____ _____.






24. A partial or total local failure in the insulation or continuity of a conductor.






25. _____ currents are reduced by laminating the core.






26. A stationary device for transferring alternating current electrical energy from one circuit to another circuit by electromagnetic means.






27. The capacity of a transformer is rated in ____ _____.






28. _____ shows that the voltages across the windings of a transformer are directly proportional to the turns in each winding.






29. Core losses are _____ loss and _____ - _____ loss.






30. A magnet made by winding a coil of wire around a soft iron core. Current passed through this winding produces magnetic lines of force in the coil.






31. Transformers with 4800 volt primaries and 120/240 volt secondaries - either pole or subway type - with two secondary windings terminating at internal links which provide for parallel operation of the secondary windings at 120 volts or series operatio






32. Modern; extremely efficient-more effective coupling between primary and secondary coils; smaller and lighter






33. The total numbre of lines or force issuing from a pole. (north or south)






34. Two coils wound on a closed iron core form a ________.






35. has a laminated iron core (layers of metal plates)






36. A transformer rated at 500KVA and below used for voltage transformation on the distribuition system.






37. The magnetic lines of force that flow from the north pole of a magnet and return to the south pole.






38. Anything above 600 volts is _____?






39. An abnormal connection of relative low resistance - whether made accidentally or intentionally - between two point of different potential in a circuit.






40. A variable transformer is a continuously adjustable _____ - has the primary winding and secondary winding electrically connected.






41. A designated limit of operating characteristics based on definite conditions.






42. A system of conductors in which at least one conductors or point (usually the middle wire or neutral point of a transformer or generator windings) is intentionally grounded either solididly or through a current-limiting device.






43. How coils serve as the primary and secondary windings for an autotransformer






44. A test instrument used to indicate low voltage potentials in the range of 110 to 600 volts either alternating or direct current. (slang term: wiggy)






45. A simple design has a core within each coil






46. Provides the ratio between the applied primary voltage and the induced secondary voltage as result of the turns ratio






47. The transformer winding to which voltage is supplied is called the _____ winding.






48. A transformer which when supplied from a constant potential source automatically maintans a constant current in its secondary circuit under varying conditions of load impedance. Used on series street light circuits.






49. Some losses occur in all transformers. These losses are classified as copper losses and _____ losses.






50. The characteristic that requires energy to carry out the constant reorientation of the magnetic dipoles in the hysteresis loss







Sorry!:) No result found.

Can you answer 50 questions in 15 minutes?


Let me suggest you:

Browse all subjects

Browse all tests

Most popular tests



Major Subjects

Tests & Exams


AP
CLEP
DSST
GRE
SAT
GMAT

Browse all subjects

Browse all tests

Most popular tests